WO2010033487A2 - Systems and methods for producing a crude product - Google Patents
Systems and methods for producing a crude product Download PDFInfo
- Publication number
- WO2010033487A2 WO2010033487A2 PCT/US2009/056932 US2009056932W WO2010033487A2 WO 2010033487 A2 WO2010033487 A2 WO 2010033487A2 US 2009056932 W US2009056932 W US 2009056932W WO 2010033487 A2 WO2010033487 A2 WO 2010033487A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- heavy oil
- contacting zone
- contacting
- oil feedstock
- slurry catalyst
- Prior art date
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G45/00—Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds
- C10G45/02—Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds to eliminate hetero atoms without changing the skeleton of the hydrocarbon involved and without cracking into lower boiling hydrocarbons; Hydrofinishing
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G65/00—Treatment of hydrocarbon oils by two or more hydrotreatment processes only
- C10G65/02—Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural serial stages only
- C10G65/10—Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural serial stages only including only cracking steps
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G49/00—Treatment of hydrocarbon oils, in the presence of hydrogen or hydrogen-generating compounds, not provided for in a single one of groups C10G45/02, C10G45/32, C10G45/44, C10G45/58 or C10G47/00
- C10G49/18—Treatment of hydrocarbon oils, in the presence of hydrogen or hydrogen-generating compounds, not provided for in a single one of groups C10G45/02, C10G45/32, C10G45/44, C10G45/58 or C10G47/00 in the presence of hydrogen-generating compounds, e.g. ammonia, water, hydrogen sulfide
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G65/00—Treatment of hydrocarbon oils by two or more hydrotreatment processes only
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G65/00—Treatment of hydrocarbon oils by two or more hydrotreatment processes only
- C10G65/02—Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural serial stages only
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G65/00—Treatment of hydrocarbon oils by two or more hydrotreatment processes only
- C10G65/02—Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural serial stages only
- C10G65/12—Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural serial stages only including cracking steps and other hydrotreatment steps
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G65/00—Treatment of hydrocarbon oils by two or more hydrotreatment processes only
- C10G65/14—Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural parallel stages only
- C10G65/18—Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural parallel stages only including only cracking steps
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G69/00—Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one other conversion process
- C10G69/02—Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one other conversion process plural serial stages only
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- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/10—Feedstock materials
- C10G2300/1037—Hydrocarbon fractions
- C10G2300/1044—Heavy gasoline or naphtha having a boiling range of about 100 - 180 °C
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- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/10—Feedstock materials
- C10G2300/107—Atmospheric residues having a boiling point of at least about 538 °C
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- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/10—Feedstock materials
- C10G2300/1074—Vacuum distillates
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- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
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- C10G2300/1077—Vacuum residues
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- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/20—Characteristics of the feedstock or the products
- C10G2300/201—Impurities
- C10G2300/202—Heteroatoms content, i.e. S, N, O, P
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- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
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- C10G2300/203—Naphthenic acids, TAN
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- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
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- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
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- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
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- C10G2300/208—Sediments, e.g. bottom sediment and water or BSW
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- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
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- C10G2300/302—Viscosity
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- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
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- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
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- C10G2300/4018—Spatial velocity, e.g. LHSV, WHSV
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- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
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- C10G2300/40—Characteristics of the process deviating from typical ways of processing
- C10G2300/44—Solvents
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- C10G2300/80—Additives
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- C10G2300/805—Water
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- C10G2300/807—Steam
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- C10G2400/00—Products obtained by processes covered by groups C10G9/00 - C10G69/14
- C10G2400/02—Gasoline
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- C10G2400/00—Products obtained by processes covered by groups C10G9/00 - C10G69/14
- C10G2400/04—Diesel oil
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- C10G2400/00—Products obtained by processes covered by groups C10G9/00 - C10G69/14
- C10G2400/08—Jet fuel
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2400/00—Products obtained by processes covered by groups C10G9/00 - C10G69/14
- C10G2400/28—Propane and butane
Definitions
- the invention relates to systems and methods for treating or upgrading heavy oil feeds, and crude products produced using such systems and methods.
- US Patent Nos. 7390398, 7431822, 7431823, and 7431831 describe processes, systems, and catalysts for processing heavy oil feeds.
- spent slurry catalyst and unconverted heavy oil feeds are recycled back to the process and combined with fresh heavy oil feeds, thus maximizing heavy oil conversion.
- the invention relates to a process for hydroprocessing a heavy oil feedstock, the process employs a plurality of contacting zones and at least a separation zone, the process comprising: providing a hydrogen containing gas feed; providing a slurry catalyst comprising an active catalyst in a hydrocarbon oil diluent; combining at least a portion of the hydrogen containing gas feed, at least a portion of the heavy oil feedstock, and at least a portion of the slurry catalyst in a first contacting zone under hydrocracking conditions at a sufficient temperature and a sufficient pressure to convert at least a portion of the heavy oil feedstock to lower boiling hydrocarbons, forming upgraded products; sending a first effluent stream from the first contacting zone comprising a mixture of the upgraded products, the slurry catalyst, the hydrogen containing gas, and unconverted heavy oil feedstock as a feed to a first separation zone, wherein volatile upgraded products are removed with the hydrogen containing gas as a first overhead stream, and the slurry catalyst, heavier
- the invention relates to a process for hydroprocessing a heavy oil feedstock, the process employing a plurality of contacting zones and at least a separation zone, including a first contacting zone and a contacting zone other than the first contacting zone, the process comprising: providing a hydrogen containing gas feed; providing a heavy oil feedstock; providing a slurry catalyst feed comprising an active metal catalyst having an average particle size of at least 1 micron in a hydrocarbon oil diluent, at a concentration of greater than 500 wppm of active metal catalyst to heavy oil feedstock; combining at least a portion of the hydrogen containing gas feed, at least a portion of the heavy oil feedstock, and at least a portion of the slurry catalyst feed in a first contacting zone under hydrocracking conditions to convert at least a portion of the first heavy oil feedstock to lower boiling hydrocarbons, forming upgraded products; sending a first effluent stream from the first contacting zone comprising the upgraded products, the slurry catalyst, the
- the invention in a third aspect, relates to a process for hydroprocessing a heavy oil feedstock, the process employing a plurality of contacting zones and at least a separation zone, including a first contacting zone and a contacting zone other than the first contacting zone, the process comprising: providing a hydrogen containing gas feed; providing a heavy oil feedstock; providing at least an additive material selected from inhibitor additives, anti- foam agents, stabilizers, metal scavengers, metal contaminant removers, metal passivators, and sacrificial materials, in an amount of less than 1 wt.
- % of the heavy oil feedstock providing a slurry catalyst feed comprising an active metal catalyst having an average particle size of at least 1 micron in a hydrocarbon oil diluent; combining at least a portion of the hydrogen containing gas feed, at least a portion of the heavy oil feedstock, at least a portion of the additive material, and at least a portion of the slurry catalyst feed in a first contacting zone under hydrocracking conditions to convert at least a portion of the first heavy oil feedstock to lower boiling hydrocarbons, forming upgraded products; sending a first effluent stream from the first contacting zone to a first separation zone, wherein volatile upgraded products are removed with the hydrogen containing gas as a first overhead stream, and the slurry catalyst, heavier hydrocracked liquid products, and unconverted heavy oil feedstock are separated and removed as a first non- volatile stream, wherein the first non- volatile stream contains less than 30% solid; collecting the first overhead stream for further processing in a product purification unit; and collecting the first non- volatile stream for further processing in
- the invention relates to a process for a process for hydroprocessing a heavy oil feedstock, the process employing a plurality of contacting zones and at least a separation zone, the process comprising: providing a hydrogen containing gas feed; providing a heavy oil feedstock; providing a slurry catalyst feed comprising an active metal catalyst having an average particle size of at least 1 micron in a hydrocarbon oil diluent; combining at least a portion of the hydrogen containing gas feed, at least a portion of the heavy oil feedstock, and at least a portion of the slurry catalyst feed in a first contacting zone under hydrocracking conditions, operating at a first pressure, to convert at least a portion of the first heavy oil feedstock to lower boiling hydrocarbons, forming upgraded products; sending a first effluent stream from the first contacting zone to a first separation zone having an entry pressure of most 100 psi less than the first pressure, wherein volatile upgraded products are removed with the hydrogen containing gas as a first overhead stream,
- Figure 1 is a flow diagram that schematically illustrates an embodiment of a once-through upgrade system with two contacting zones running in sequential mode (series).
- Figure 2 is a flow diagram of a second embodiment of an upgrade process with three contacting zones running in sequential mode, with each of the contacting zones having a separation zone in series with optional by-pass.
- Figure 3 is a flow diagram of another embodiment of a once-through upgrade process with three contacting zones running in tandem (parallel), with each of the contacting zones having a separation zone in series with optional by-pass.
- Figure 4 is a flow diagram of an embodiment of a flexible once-through upgrade process with a plurality of contacting zones and separation zones, and with some of the contacting zones running in sequential mode, with the third reactor on stand-by, or running in tandem with separate feed streams.
- Figure 5 is a flow diagram of another embodiment of the flexible once-through upgrade process with the units running in tandem (parallel) with steam injection, VGO and additive feeds to some of the contacting zones.
- Figure 6 is a flow diagram of another embodiment of the flexible once-through upgrade process with three contacting zones running in tandem (parallel) and sharing one separation zone.
- Figure 7 is a flow diagram of yet another embodiment of a once-through upgrade process with two contacting zones running in sequential mode, which sequential operation is in tandem with a single contacting in an upgrade operation with its own heavy oil feed, optional VGO feed, and catalyst feed.
- the present invention relates to an improved system to treat or upgrade heavy oil feeds, particularly heavy oil feedstock having high levels of heavy metals.
- heavy oil feeds particularly heavy oil feedstock having high levels of heavy metals.
- heavy oil feed or feedstock refers to heavy and ultra-heavy crudes, including but not limited to resids, coals, bitumen, shale oils, tar sands, etc.
- Heavy oil feedstock may be liquid, semi-solid, and / or solid. Examples of heavy oil feedstock that might be upgraded as described herein include but are not limited to Canada Tar sands, vacuum resid from Brazilian Santos and Campos basins, Egyptian Gulf of Suez, Chad, Venezuelan Zulia, Malaysia, and Indonesia Sumatra.
- heavy oil feedstock examples include bottom of the barrel and residuum left over from refinery processes, including "bottom of the barrel” and “residuum” (or “resid”) — atmospheric tower bottoms, which have a boiling point of at least 343 0 C. (65O 0 F.), or vacuum tower bottoms, which have a boiling point of at least 524 0 C. (975 0 F.), or "resid pitch” and "vacuum residue” - which have a boiling point of 524 0 C. (975 0 F.) or greater.
- Properties of heavy oil feedstock may include, but are not limited to: TAN of at least 0.1, at least 0.3, or at least 1; viscosity of at least 10 cSt; API gravity at most 15 in one embodiment, and at most 10 in another embodiment.
- a gram of heavy oil feedstock typically contains at least 0.0001 grams of Ni/V/Fe; at least 0.005 grams of heteroatoms; at least 0.01 grams of residue; at least 0.04 grams C5 asphaltenes; at least 0.002 grams of MCR; per gram of crude; at least 0.00001 grams of alkali metal salts of one or more organic acids; and at least 0.005 grams of sulfur.
- the heavy oil feedstock has a sulfur content of at least 5 wt. % and an API gravity of from -5 to +5.
- the heavy oil feedstock comprises Athabasca bitumen (Canada) having at least 50% by volume vacuum resid.
- the feedstock is a Boscan (Venezuela) feed with at least 64 % by volume vacuum residue.
- the heavy oil feedstock contains at least 100 ppm V (per gram of heavy oil feedstock).
- the V level ranges between 500 and 1000 ppm. In a third embodiment, at least 2000 ppm.
- treatment when used in conjunction with a heavy oil feedstock, describes a heavy oil feedstock that is being or has been subjected to hydroprocessing, or a resulting material or crude product, having a reduction in the molecular weight of the heavy oil feedstock, a reduction in the boiling point range of the heavy oil feedstock, a reduction in the concentration of asphaltenes, a reduction in the concentration of hydrocarbon free radicals, and/or a reduction in the quantity of impurities, such as sulfur, nitrogen, oxygen, halides, and metals.
- hydroprocessing The upgrade or treatment of heavy oil feeds is generally referred herein as "hydroprocessing”.
- Hydroprocessing is meant as any process that is carried out in the presence of hydrogen, including, but not limited to, hydro conversion, hydrocracking, hydrogenation, hydrotreating, hydrodesulfurization, hydrodenitrogenation, hydrodemetallation, hydrodearomatization, hydroisomerization, hydrodewaxing and hydrocracking including selective hydrocracking.
- the products of hydroprocessing may show improved viscosities, viscosity indices, saturates content, low temperature properties, volatilities and depolarization, etc.
- hydrogen refers to hydrogen, and / or a compound or compounds that when in the presence of a heavy oil feed and a catalyst react to provide hydrogen.
- SCF / BBL refers to a unit of standard cubic foot of gas (N 2 , H 2 , etc.) per barrel of hydrocarbon feed.
- Nm 3 /m 3 refers to normal cubic meters of gas per cubic meter of heavy oil feed.
- VGO or vacuum gas oil referring to hydrocarbons with a boiling range distribution between 343 0 C (65O 0 F) and 538 0 C (1000 0 F) at 0.101 MPa.
- wppm means weight parts per million.
- catalyst precursor refers to a compound containing one or more catalytically active metals, from which compound a catalyst is eventually formed. It should be noted that a catalyst precursor may be catalytically active as a hydroprocessing catalyst. As used herein, “catalyst precursor” may be referred herein as “catalyst” when used in the context of a catalyst feed.
- fresh catalyst refers to a catalyst or a catalyst precursor that has not been used in a reactor in a hydroprocessing operation.
- fresh catalyst herein also includes "re-generated” or “rehabilitated” catalysts, e.g., catalyst that has been used in at least a reactor in a hydroprocessing operation ("used catalyst") but its catalytic activity has been restored or at least increased to a level well above the used catalytic activity level.
- used catalyst catalyst that has been used in at least a reactor in a hydroprocessing operation
- fresh catalyst may be used interchangeably with "fresh slurry catalyst”.
- slurry catalyst or sometimes referred to as
- slurry refers to a liquid medium, e.g., oil, water, or mixtures thereof, in which catalyst and / or catalyst precursor particles (aggregates, particulates or crystallites) are dispersed within.
- the term slurry catalyst refers to a fresh catalyst, or a catalyst that has been used in heavy oil upgrading and with diminished activity.
- the slurry catalyst feed stream contains a fresh catalyst.
- the slurry catalyst feed contains a well-dispersed catalyst precursor composition capable of forming an active catalyst in situ within the feed heaters and/or the contacting zone.
- the catalyst particles can be introduced into the medium (diluent) as powder in one embodiment, a precursor in another embodiment, or after a pre-treatment step in a third embodiment.
- the medium (or diluent) is a hydrocarbon oil diluent.
- the liquid medium is the heavy oil feedstock itself.
- the liquid medium is a hydrocarbon oil other than the heavy oil feedstock, e.g., a VGO medium or diluent.
- the "catalyst feed” includes any catalyst suitable for upgrading heavy oil feed stocks, e.g., one or more bulk catalysts and / or one or more catalysts on a support.
- the catalyst feed is in the form of a slurry catalyst.
- the term “bulk catalyst” may be used interchangeably with “unsupported catalyst,” meaning that the catalyst composition is NOT of the conventional catalyst form which has, e.g., having a preformed, shaped catalyst support which is then loaded with metals via impregnation or deposition catalyst.
- the bulk catalyst is formed through precipitation.
- the bulk catalyst has a binder incorporated into the catalyst composition.
- the bulk catalyst is formed from metal compounds and without any binder.
- the bulk catalyst is a dispersing-type catalyst for use as dispersed catalyst particles in mixture of liquid (e.g., hydrocarbon oil).
- the catalyst comprises one or more commercially known catalysts, e.g., MicrocatTM from ExxonMobil Corp.
- the term "contacting zone” refers to an equipment in which the heavy oil feed is treated or upgraded by contact with a slurry catalyst feed in the presence of hydrogen. In a contacting zone, at least a property of the crude feed may be changed or upgraded.
- the contacting zone can be a reactor, a portion of a reactor, multiple portions of a reactor, or combinations thereof.
- the term “contacting zone” may be used interchangeably with “reacting zone”..
- the upgrade process comprises a plurality of reactors, employed as contacting zones, with the reactors being the same or different in configurations.
- reactors that can be used herein include stacked bed reactors, fixed bed reactors, ebullating bed reactors, continuous stirred tank reactors, fluidized bed reactors, spray reactors, liquid / liquid contactors, slurry reactors, liquid recirculation reactors, and combinations thereof.
- the reactor is an up-flow reactor.
- the contacting zone refers to at least a slurry-bed hydrocracking reactor in series with at least a fixed bed hydrotreating reactor.
- at least one of the contacting zones further comprises an in-line hydrotreater, capable of removing over 70% of the sulfur, over 90% of nitrogen, and over 90% of the heteroatoms in the crude product being processed.
- the term "separation zone” refers to an equipment in which upgraded heavy oil feed from a contacting zone is either fed directly into, or subjected to one or more intermediate processes and then fed directly into the separation zone, e.g., a high pressure high temperature flash drum or flash separator, wherein gases and volatile liquids are separated from the non- volatile fraction.
- the non-volatile fraction stream comprises unconverted heavy oil feed, a small amount of heavier hydrocracked liquid products (synthetic or less-volatile / non-volatile upgraded products), the slurry catalyst and any entrained solids (asphaltenes, coke, etc.).
- the separation zone provides a pressure drop from one contacting zone to the next one in series. The pressure drop induces by the separation zone allows the gas and volatile liquids to be separated from the non-volatile fraction.
- both the contacting zone and the separation zone are combined into one equipment, e.g., a reactor having an internal separator, or a multi-stage reactor-separator.
- a reactor having an internal separator or a multi-stage reactor-separator.
- the vapor product exits the top of the equipment, and the non- volatile fractions exit the side or bottom of the equipment with the slurry catalyst and entrained solid fraction, if any.
- the upgrade system comprises a single reactor followed by a separator.
- the system comprises at least two upflow reactors in series with at least a separator, with at least a separator being positioned right after the last reactor in series.
- a plurality of reactors in series operating as a single train.
- a plurality of reactors configured in combination of parallel and series operations.
- the upgrade system is configured for flexible operation, going from one operating mode to another, e.g., running in parallel (tandem) to running in series (sequential) with different combinations of reactors / flash separators.
- the upgrade system may comprise a combination of reactors and separators in series with multi-stage reactor-separators, with a solvent deasphalting (SDA) unit being positioned as an interstage treatment system between any two reactors in series, or before the first reactor in the series.
- SDA solvent deasphalting
- the upgrade system is characterized as operating in once-through mode, which differs from the upgrade system in the prior art in that slurry catalyst and heavy oil feedstock flow through the contacting zone(s) once, instead of being recycled or recirculated around the system as in the prior art.
- slurry catalyst and heavy oil feedstock flow through the contacting zone(s) once, instead of being recycled or recirculated around the system as in the prior art.
- virtually none of the unconverted material and slurry catalyst mixture is recycled back to the 1 st (or previous) contacting zone or reactor in the series.
- Non-volatile materials from the last separation zone in the upgrade system comprising unconverted materials, heavier hydrocracked liquid products (synthetic products or non- volatile / less-volatile upgraded products), slurry catalyst, small amounts of coke, asphaltenes, etc., in one embodiment are sent off-site for further processing / regeneration of the catalyst, or to a deoiling unit to separate the spent catalyst from the hydrocarbons, and subsequently to a metal recovery unit to recover precious metals from the spent catalyst.
- the deoiling unit and / or the metal recovery unit can be in the same location as the once-through upgrade system, or they can be in a different location from the once- through upgrade system, e.g., deoiling being handled by a different party in a different location or country, and / or metal recovery is done off-site by a contractor in a different location or country.
- Process Conditions In one embodiment, the upgrade system is maintained under hydrocracking conditions, e.g., at a minimum temperature to effect hydrocracking of a heavy oil feedstock.
- the system operates at a temperature ranging from 400 0 C (752 0 F) to 600 0 C (1112 0 F), and a pressure ranging from 10 MPa (1450 psi) to 25 MPa (3625 psi).
- the process condition being controlled to be more or less uniformly across the contacting zones. In another embodiment, the condition varies between the contacting zones for upgrade products with specific properties.
- the contacting zone process temperature ranges from about 400 0 C (752 0 F) to about 600 0 C (1112 0 F), less than 500 0 C (932 0 F) in another embodiment, and greater than 425 0 C. (797 0 F) in another embodiment.
- the system operates with a temperature difference between the inlet and outlet of a contacting zone ranging from 5 to 5O 0 F.
- the temperature of the separation zone is maintained within + 9O 0 F (about + 5O 0 C) of the contacting zone temperature in one embodiment, within + 7O 0 F (about + 38.9 0 C) in a second embodiment, within + 15 0 F (about + 8.3 0 C) in a third embodiment, and within + 5 0 F (about + 2.8 0 C) in a fourth embodiment.
- the temperature difference between the last separation zone and the immediately preceding contacting zone is within + 5O 0 F (about + 28 0 C).
- the process pressure in the contacting zones ranges from about 10 MPa (1,450 psi) to about 25 MPa (3,625 psi) in one embodiment, about 15 MPa (2,175 psi) to about 20 MPa (2,900 psi) in a second embodiment, less than 22 MPa (3,190 psi) in a third embodiment, and more than 14 MPa (2,030 psi) in a fourth embodiment.
- the once-through upgrade system is characterized by a much higher throughput rate as compared to an upgrade system in the prior art (with recycle of unconverted heavy oil feeds).
- the liquid hourly space velocity (LHSV) of the heavy oil feed in each of the contacting zones will generally range from about 0.075 h "1 to about 2 h "1 in one embodiment; about 0.1 h. -1 to about 1.5 h "1 in a second embodiment, about 0.15 h "1 to about 1.75 h “1 in a third embodiment, about 0.2 h “1 to about 1 h “1 in a fourth embodiment, and about 0.2 h “1 to about 0.5 h "1 in a fifth embodiment
- LHSV is at least 0.1 h "1 . In another embodiment, the LHSV is less than 0.3 h "1 .
- the contacting zone comprises a single reactor or plurality of reactors in series, providing a total residence time ranging from 0.1 to 15 hours.
- the resident time ranges from 0.5 to 5 hrs.
- the total residence time in the contacting zone ranges from 0.2 to 2 hours.
- Minimizing Pressure Drop In the prior art, it is disclosed that with a higher pressure drop in a heavy oil upgrade system, i.e., a pressure drop upon entering the separation zone of up to 1000 psi and preferably in the range of 300 to 700 psi, lighter boiling materials can be more easily separated / removed from the upgrade system via the separation zone. A high pressure drop can be induced with the introduction of pressure reducing devices.
- an upgrade system with a higher pressure drop is found to be operationally unstable, particularly with frequent plugging due to deposit in equipment and / or common valve operating problems including failure to open at set pressure due to plugging of the valve inlet or outlet, corrosion, or erosion of valves.
- the once-through upgrade system is configured for optimal operation, e.g., efficiency with much less downtime due to equipment plugging compared to the prior art with less than 100 psi pressure drop.
- the optimal efficiency is obtained in one embodiment with minimal pressure drop in the system, wherein the pressure of the separation zone is maintained within +_10 to + 100 psi of the preceding contacting zone in one embodiment, within + 20 to + 75 psi in a second embodiment, and within + 50 to + 100 psi in a third embodiment.
- the pressure drop refers to the difference between the exit pressure of the preceding contacting zone X and the entry pressure of the separation Y, with (X-Y) being less than 100 psi.
- Optimal efficiency can also be obtained with minimal pressure from one contacting zone to the next contacting zone for a system operating sequentially, with the pressure drop being maintained to be 100 psi or less in one embodiment, and 75 psi or less in a second embodiment, and less than 50 psi in a third embodiment.
- the pressure drop herein refers to the difference between the exit pressure of one contacting zone and the entry pressure of the next contacting zone.
- the contacting zone is in direct fluid communication to the next separation zone or contacting zone for a minimum pressure drop.
- direct fluid communication means that there is free flow from the contacting zone to the next separation zone (or the next contacting zone) in series, with no flow restriction.
- direct fluid communication is obtained with no flow restriction due to presence of valves, orifices (or a similar device), or changes in pipe diameter.
- the minimal pressure drop from the contacting zone to the next separation zone or contacting zone is due to piping components, e.g., elbows, bends, tees in the line, etc., and not due to the use of pressure reducing device such as valves, control valves, etc. to induce the pressure drop as in the prior art.
- pressure reducing device such as valves, control valves, etc.
- the minimal pressure drop is induced by friction loss, wall drag, volume increase, and changes in height as the effluent flows from the contacting zone to the next equipment in series. If valves are used in the once through system, the valves are selected / configured such that the pressure drop from one equipment, e.g., the contacting zone, to the next piece of equipment is kept to be at 100 psi or lower.
- a hydrogen source is provided to the process.
- the hydrogen can also be added to the heavy oil feed prior to entering the preheater, or after the preheater.
- the hydrogen feed enters the contacting zone co-currently with the heavy oil feed in the same conduit.
- the hydrogen source may be added to the contacting zone in a direction that is counter to the flow of the feed.
- the hydrogen enters the contacting zone via a gas conduit separately from the combined heavy oil and slurry catalyst feed stream.
- the hydrogen feed is introduced directly to the combined catalyst and heavy oil feedstock prior to being introduced into the contacting zone.
- the hydrogen gas and the combined heavy oil and catalyst feed are introduced at the bottom of the reactor as separate streams.
- hydrogen gas can be fed into several sections of/ locations on the contacting zone.
- the hydrogen source is provided to the process at a rate
- Nm /m (based on ratio of the gaseous hydrogen source to the heavy oil feed) of 0.1 Nm /m to about 100,000 Nm 3 /m 3 (0.563 to 563,380 SCF/bbl), about 0.5 Nm 3 /m 3 to about 10,000 Nm 3 /m 3 (2.82 to 56,338 SCF/bbl), about 1 Nm 3 /m 3 to about 8,000 Nm 3 /m 3 (5.63 to 45,070 SCF/bbl), about 2 Nm 3 /m 3 to about 5,000 NmW (11.27 to 28,169 SCF/bbl), about 5 NmV 3 to about 3,000 Nm 3 /m 3 (28.2 to 16,901 SCFMl), or about 10 Nm 3 W to about 800 Nm 3 W (56.3 to 4,507 SCF/bbl).
- some of the hydrogen (25 -75%) is supplied to the first contacting zone, and the rest is added as supplemental hydrogen to other contacting zones in the system.
- the hydrogen source in some embodiments, is combined with carrier gas(es) and recirculated through the contacting zone.
- Carrier gas may be, for example, nitrogen, helium, and/or argon.
- the carrier gas may facilitate flow of the heavy oil feed and/or flow of the hydrogen source in the contacting zone(s).
- the carrier gas may also enhance mixing in the contacting zone(s).
- a hydrogen source for example, hydrogen, methane or ethane
- Catalyst Feed In one embodiment for an upgrade system running in sequential mode, all of the slurry catalyst feed is provided to the first contacting zone. In other embodiments of the sequential mode, at least a portion of the catalyst feed is "split" or diverted to at least one other contacting zones in the system (other than the first contacting zone). In another embodiment with the contacting zones running in tandem (parallel), all the contacting zones in operation receive a slurry catalyst feed (along with a heavy oil feed). [060] In one embodiment, "at least a portion" means at least 10% of the catalyst feed. In another embodiment, at least 20%. In a third embodiment, at least 40%. In a fourth embodiment, at least 50% of the catalyst feed is diverted to at least a contacting zone other than the first one.
- the catalyst feed is fed to the first contacting zone in the system, with 40% or more of the fresh catalyst being diverted to the other contacting zone(s) in the system.
- the catalyst feed is being equally split between the contacting zones in the system.
- at least a portion of the fresh catalyst feed is sent to at least one of the intermediate contacting zones and / or the last contacting zone in the system.
- the process is configured for a flexible catalyst feed scheme such that the catalyst feed can sometimes be fed at full rate (100% of the required catalyst rate) to the first reactor in the system for a certain period of time, then split equally or according to pre-determined proportions to all of the reactors in the system for a pre-determined amount of time, or split according to pre-determined proportions for the catalyst feed to be fed to the different reactors at different concentrations.
- the slurry catalyst feed used herein may comprise one or more different slurry catalysts as a single catalyst feed stream or separate feed streams.
- a single fresh catalyst feed stream is supplied to the contacting zones.
- the fresh catalyst feed comprises multiple and different catalyst types, with a certain catalyst type going to one or more contacting zones (e.g., the first contacting zone in the system) as a separate stream, and a different slurry catalyst going to contacting zone(s) other than the 1 st contacting zone in the system as a different catalyst stream.
- a Ni-only or a NiMo sulfide slurry catalyst rich in Ni is sent to the front end reactor to help reduce vanadium trapping in the system, while a different catalyst, e.g., Mo sulfide or a NiMo sulfide catalyst rich in Mo, can be injected into the back end reactor(s) to maintain an overall high conversion rate, improve product quality and possibly reduce the gas yield in one embodiment.
- a slurry catalyst rich in Ni means that the Ni / Mo ratio is greater than 0.15 (as wt. %)
- a slurry catalyst rich in Mo means that the Ni / Mo ratio is less than 0.05 (as wt. %).
- the slurry catalyst feed is first preconditioned before entering one of the contacting zones, or before being brought into contact with the heavy oil feed before entering the contacting zones.
- the catalyst enters into a preconditioning unit along with hydrogen at a rate from 500 to 7500 SCF / BBL (BBL here refers to the total volume of heavy oil feed to the system). It is believed that instead of bringing a cold catalyst in contact with the heavy oil feed, the preconditioning step helps with the hydrogen adsorption into the active catalyst sites, and ultimately the conversion rate.
- the slurry catalyst / hydrogen mixture is heated to a temperature between 300 0 F to 1000 0 F (149 to 538 0 C).
- the catalyst is preconditioned in hydrogen at a temperature of 500 to 725 0 F (260 to 385 0 C.) .
- the mixture is heated under a pressure of 300 to 3200 psi in one embodiment; 500 - 3000 psi in a second embodiment; and 600 - 2500 psi in a third embodiment.
- Slurry Catalysts Employed The slurry catalyst comprises an active catalyst in a hydrocarbon oil diluent.
- the catalyst is a sulf ⁇ ded catalyst comprising at least a Group VIB metal, or at least a Group VIII metal, or at least a group HB metal, e.g., a ferric sulfide catalyst, zinc sulfide, nickel sulfide, molybdenum sulfide, or an iron zinc sulfide catalyst.
- the catalyst is a multi-metallic catalyst comprising at least a Group VIB metal and at least a Group VIII metal (as a promoter), wherein the metals may be in elemental form or in the form of a compound of the metal.
- the catalyst is a MoS 2 catalyst promoted with at least a group VIII metal compound.
- the catalyst is a bulk multi-metallic catalyst comprising at least one Group VIII non-noble metal and at least two Group VIB metals, and wherein the ratio of the at least two Group VIB metals to the Group VIII non-noble metal is from about 10:1 to about 1 :10.
- the catalyst is of the formula (M%(X ⁇ (S v UC w ) e (li x )j(O y )g( ⁇ z ) k , wherein M represents at least one group VIB metal, such as Mo, W, etc.
- S represents sulfur with the value of the subscript d ranging from (a + 0.5b) to (5a + 2b).
- C represents carbon with subscript e having a value of 0 to ⁇ ⁇ (a+b).
- H is hydrogen with the value of/ranging from 0 to l(a+b).
- O represents oxygen with the value of g ranging from 0 to 5(a + b); and N represents nitrogen with h having a value of 0 to 0.5( ⁇ + b).
- subscript b has a value of 0, for a single metallic component catalyst, e.g., Mo only catalyst (no promoter).
- the catalyst is prepared from catalyst precursor compositions including organometallic complexes or compounds, e.g., oil soluble compounds or complexes of transition metals and organic acids.
- organometallic complexes or compounds e.g., oil soluble compounds or complexes of transition metals and organic acids.
- examples of such compounds include naphthenates, pentanedionates, octoates, and acetates of Group VIB and Group VIII metals such as Mo, Co, W, etc. such as molybdenum naphthanate, vanadium naphthanate, vanadium octoate, molybdenum hexacarbonyl, and vanadium hexacarbonyl.
- the slurry catalyst has an average particle size of at least 1 micron. In another embodiment, the slurry catalyst has an average particle size in the range of 1 - 20 microns. In a third embodiment, the slurry catalyst has an average particle size in the range of 2 - 10 microns. In one embodiment, the slurry catalyst particle comprises aggregates of catalyst molecules and/or extremely small particles that are colloidal in size (e.g., less than 100 nm, less than about 10 nm, less than about 5 nm, and less than about 1 nm). In yet another embodiment, the catalyst particle comprises aggregates of single layer MoS 2 clusters of nanometer sizes, e.g., 5-10 nm on edge. In operations, the colloidal / nanometer sized particles aggregate in a hydrocarbon diluent, forming a slurry catalyst with an average particle size in the range of 1-20 microns.
- a sufficient amount of slurry catalyst is fed to the contacting zone(s) for each contacting zone to have a slurry (solid) catalyst concentration of at least 500 wppm to 3 wt.% (catalyst metal to heavy oil ratio).
- the amount of catalyst feed into the contacting zone(s) ranges from 500 to 7500 wppm of the catalyst metal in heavy oil feed.
- the concentration of the fresh catalyst feed ranges from 750 to 5000 wppm catalyst metal.
- the concentration is less than 3000 wppm.
- the concentration is at least 1200 ppm.
- Catalyst metal refers to the active metal in the catalyst, e.g., for a NiMo sulfide slurry catalyst in which Ni is used as a promoter, the catalyst metal herein refers to the Mo concentration.
- the catalyst metal herein refers to the Mo concentration.
- the low catalyst level further results in unstable operations, e.g., letdown, coking, plugging, etc. with unconverted heavy oil in the equipment, particularly the reactors.
- Optional Treatment System - SDA In one embodiment, a solvent deasphalting unit (SDA) is employed before the first contacting zone to pre -treat the heavy oil feedstock. In yet another embodiment, the SDA is employed as an intermediate unit located after one of the intermediate separation zones. SDA units are typically used in refineries to extract incremental lighter hydrocarbons from a heavy hydrocarbon stream, whereby the extracted oil is typically called deasphalted oil (DAO), while leaving a residue stream behind that is more concentrated in heavy molecules and heteroatoms, typically known as SDA Tar, SDA Bottoms, etc.
- DAO deasphalted oil
- the SDA can be a separate unit or a unit integrated into the upgrade system.
- a suitable solvent to be used includes, but not limited to hexane or similar C6+ solvent for a low volume SDA Tar and high volume DAO. This scheme would allow for the vast majority of the heavy oil feed to be upgraded in the subsequent contacting zone, while the very heaviest, bottom of the barrel bottoms that does not yield favorable incremental conversion economics due to the massive hydrogen addition requirement, to be used in some other manner.
- all of the heavy oil feed is pre-treated in the SDA and the DAO product is fed into the first contacting zone, or fed according to a split feed scheme with at least a portion going to a contacting zone other than the first in the series.
- some of the heavy oil feed (depending on the source) is first pre-treated in the SDA and some of the feedstock is fed directly into the contacting zone(s) untreated.
- the DAO is combined with the untreated heavy oil feedstock as one feed stream to the contacting zone(s).
- the DAO and the untreated heavy oil feedstock are fed to the system as in separate feed conduits, with the DAO going to one or more of the contacting zones and the untreated heavy oil feed going to one or more of the same or different contacting zones.
- the non- volatile fraction comprising the slurry catalyst and optionally minimum quantities of coke / asphaltenes, etc. from at least one of the separation zones is sent to the SDA for treatment.
- the DAO is sent to at least one of the contacting zones as a feed stream by itself, in combination with a heavy oil feedstock as a feed, or in combination with the bottom stream from one of the separation zones as a feed.
- the DAO Bottoms comprising asphaltenes are sent away to recover metal in any carry-over slurry catalyst, or for applications requiring asphaltenes, e.g., blended to fuel oil, used in asphalt, or utilized in some other applications.
- the quality of the DAO and DAO Bottoms is varied by adjusting the solvent used and the desired recovery of DAO relative to the heavy oil feed.
- an optional pretreatment unit such as the SDA
- the more DAO oil that is recovered the poorer the overall quality of the DAO, and the poorer the overall quality of the DAO Bottoms.
- the solvent selection typically, as a lighter solvent is used for the SDA, less DAO will be produced, but the quality will be better, whereas if a heavier solvent is used, more DAO will be produced, but the quality will be lower. This is due to, among other factors, the solubility of the asphaltenes and other heavy molecules in the solvent.
- the heavy oil feed here herein may comprise one or more different heavy oil feeds from different sources as a single feed stream, or as separate heavy oil feed streams.
- a single heavy oil conduit pipe goes to all the contacting zones.
- multiple heavy oil conduits are employed to supply the heavy oil feed to the different contacting zones, with some heavy oil feed stream(s) going to one or more contacting zones, and other heavy oil feed stream(s) going to one or more different contacting zones.
- At least a portion of the heavy oil feed (to be upgraded) is "split" or diverted to at least one other contacting zones (other than the first contacting zone), or to a SDA unit prior to being fed into a contacting zone.
- less than 90% of the unconverted heavy oil feed is fed to the first reactor in the system, with 10% or more of the unconverted heavy oil feed being diverted to the other contacting zone(s) in the system.
- the heavy oil feed is being equally split between the contacting zones in the system.
- the heavy oil feedstock is preheated prior to being blended with the slurry catalyst feed stream(s). In another embodiment, the blend of heavy oil feedstock and slurry catalyst feed is preheated to create a feedstock that is sufficiently of low viscosity to allow good mixing of the catalyst into the feedstock.
- the preheating is conducted at a temperature that is at least about 100 0 C (212 0 F) less than the hydrocracking temperature within the contacting zone. In another embodiment, the preheating is at a temperature that is about at least 5O 0 C less than the hydrocracking temperature within the contacting zone. In a third embodiment, the preheating of the heavy oil feedstock and / or a mixture of heavy oil feedstock and slurry catalyst is at a temperature of 500 - 700°F (260 - 371°C).
- the front-end contacting zone means the 1 st reactor in a sequential operation with a plurality of contacting zones.
- the first front-end contacting zone may include both first and second reactors.
- at least an anti-foam agent is injected to at least a contacting zone in the system to minimize the amount of foam and enable full utilization of the reaction zone.
- anti-foam includes both anti-foam and defoamer materials, for preventing foam from happening and / or reducing the extent of foaming. Additionally, some anti-foam material may have both functions, e.g., reducing / mitigating foaming under certain conditions, and preventing foam from happening under other operating conditions.
- Anti-foam agents can be selected from a wide range of commercially available products such as the silicones, e.g., polydimethyl siloxane (PDMS), polydiphenyl siloxane, fluorinated siloxane, etc., in an amount of 1 to 500 ppm of the heavy oil feedstock.
- PDMS polydimethyl siloxane
- polydiphenyl siloxane polydiphenyl siloxane
- fluorinated siloxane etc.
- a high molecular PDMS is used, e.g., with a viscosity of over 60,000 cSt in one embodiment, over 100,000 cSt in another embodiment, and over 600,000 cSt in a third embodiment. It is believed that a higher viscosity (higher molecular weight) anti-foam agent decomposes more slowly and less prone to catalyst poisoning due to Si contamination.
- the anti-foam agent is added to a hydrocarbon solvent such as kerosene, which reduces the viscosity of the anti-foam and makes it pumpable.
- a hydrocarbon solvent such as kerosene
- the ratio of anti-foam to solvent ranges from 1 : 1 to 1 : 1000. In another embodiment, from 1 :2 to 1 : 100. In a third embodiment, from 1 :3 to 1 :50.
- the anti-foam agent is diluted in a sufficient amount of hydrocarbon solvent for it to have a viscosity of less than 1000 cSt, so it can be handled using standard equipment.
- the anti-foam is added directly to the heavy oil feedstock.
- the mixture is injected into multiple points along an up flow reactor.
- the anti-foam solvent mixture is injected to the top of the up flow reactor.
- the injection is into a region within the upper 30% of the reactor height. The injection of the anti-foam into the top of the reactor in one embodiment increases the liquid back mixing in the reactor.
- Optional Additives - Inhibitors / Stabilizers / Sacrificial Materials in addition to or in place of the anti-foam agents, at least an additive selected from inhibitors, stabilizers, metal scavengers, metal contaminant removers, metal passivators, and sacrificial materials is added to the contacting zone in an amount ranging from 1 to 20,000 ppm of the heavy oil feed (collectively, "additive material"). In a second embodiment, the additive material is added in an amount of less than 10,000 ppm. In a third embodiment, the additive material ranges from 50 to 1000 ppm.
- some additives may have multiple functions.
- some metal scavengers may also function as metal contaminant removers and / or metal passivators under the appropriate conditions.
- the sacrificial material used may function as a metal scavenger for adsorbing heavy metals in the heavy oil feed.
- the additive material is added directly to the heavy oil feedstock. In another embodiment, the additive material is added to the slurry catalyst feed. In a third embodiment, the additive material is added to the contacting zone as a separate feed stream.
- the additive material can be added as is, or in a suitable diluent or carrier solvent.
- suitable carrier solvents include but are not limited to aromatic hydrocarbon solvents such as toluene, xylene, and crude oil derived aromatic distillates.
- Exemplary diluents include vacuum gas oil, diesel, decant oil, cycle oil, and or light gas oil.
- the additive material may be dispersed in a small portion of the heavy oil feedstock.
- the additive material is injected into the top section of the reactor. In another embodiment, the additive material is injected into a plurality of feed ports along an upflow reactor.
- the additive material is selected to effect a good emulsification or dispersion of the asphaltenes in the heavy oil.
- the additive is selected to increase storage stability and or improved pumpability of the heavy oil feedstock.
- the additive is a stabilizer compound containing polar bonds such as acetone, diethyl ketone, and nitrobenze, added in an amount between 0.001 to 0.01 wt. % of the heavy oil feed.
- the additive material is an inhibitor additive, selected from the group of oil soluble polynuclear aromatic compounds, elastic modulus lowering agents, e.g., organic and inorganic acids and bases and metallo-porphyrins.
- the additive is a selected alkoxylated fatty amine or fatty amine derivative and a special metal salt compound, e.g., a metal soap.
- the additive material is a "sacrificial material” (or “trapping material”) which functions to trap, or for the deposit of, and / or immobilization of deposited coke and / or metals (Ni, V, Fe, Na) in the heavy oil feed, mitigating the detrimental effects on these materials on the catalyst and / or equipment.
- the additive material functions to immobilize / adsorb the asphaltenes in the heavy oil feedstock, thus mitigating catalyst deactivation.
- the sacrificial material has large pores, e.g, having a BET surface area of at least 1 m 2 /g in one embodiment, at least 10 m 2 /g in a second embodiment, and at least 25 m 2 /g in another embodiment.
- the additive material is a sacrificial material having a pore volume of at least 0.005 cm 3 /g. In a second embodiment, a pore volume of at least 0.05 cm 3 /g. In a third embodiment, a total pore volume of at least 0.1 cm /g. In a fourth embodiment, a pore volume of at least 0.1 cm /g. In one embodiment, the sacrificial material has a pore volume of at least 0.5 cm 3 /g. In another embodiment, at least 1 cm 3 /g.
- the sacrificial material comprises a large pore inert material such microspheres of calcined kaolin clay.
- the sacrificial material is characterized by having at least 20% of its pore volume constituted by pores of at least 100 Angstrom; and 150-600 Angstrom in a second embodiment.
- additive materials for use in trapping deposits/ metal scavenging include but are not limited to silicate compounds such as Mg 2 SiO 4 and Fe 2 SiO 4 ; inorganic oxides such as iron oxide compounds, e.g., FeO. Fe 2 O 3 , FeO, Fe 3 O 4 , Fe 2 O 3 , etc.
- silicate compounds such as fume silica, Al 2 O 3 , MgO, MgAl 2 O 4 , zeolites, microspheres of calcined kaolin clay, titania, active carbon, carbon black, and combinations thereof.
- metal passivators include but are not limited to alkaline earth metal compounds, antimony, and bismuth.
- the additive material is a commercially available metal scavenger from sources such as Degussa, Albermale, Phosphonics, and Polysciences.
- the metal scavenger is a macroporous organo function polysiloxane from Degussa under the tradename DELOXANETM.
- the scavenger / trapping / scavenger material originates from a slurry catalyst, specifically, a spent slurry catalyst in a dry powder form.
- the spent slurry catalyst is from a heavy oil upgrade system having at least 75% of the heavy oil removed using means known in the art, e.g., deoiling via membrane filtration, solvent extraction, and the like.
- the spent slurry catalyst for use as a sacrificial material in one embodiment has a BET surface area of at least 1 m 2 /g for the trapping of coke / metals that would otherwise deposit along the reactor internals.
- the spent slurry catalyst has a BET surface area of at least 10 m 2 /g.
- the BET surface area is greater than 100 m 2 /g.
- the additive is a scavenger / trapping / scavenger material originated from a spent deoiled slurry catalyst, wherein some or most of the metals have been removed.
- the additive is in the form of dried spent slurry catalyst having at least some or most of the metals such as nickel, molybdenum, cobalt, etc., removed from the spent catalyst.
- the sacrificial material is in the form of solid residue comprising coke and some group VB metal complex, such as ammonium metavanadate, which residue is obtained after most of the metals such as molybdenum and nickel have been removed in a pressure leaching process.
- the sacrificial material is in the form of solid residue comprising primarily coke, with very little vanadium left (in the form of ammonium metavanadate).
- the sacrificial material is carbon black which is selected due to its high surface area, various pore size structure, and easy recovery / separation from heavy metals by combustion. Furthermore, the carbon material is relatively soft, thus minimizing damage on let down valves and other plant materials.
- the carbon material can be any generally commonly known and commercially available material. Examples include but are not limited to porous particulate carbon solid characterized by a size distribution ranging from 1 to 100 microns and a BET surface area ranging from 10 to over 2,000 m 2 'g. In one embodiment, the carbon material has an average particle size ranging from 1 to 50 microns and a BET surface area from about 90 to about 1 ,500 m 27 g.
- the carbon material has an average particle size ranging from 10 to 30 microns.
- the catalyst material can be pretreated by one or more techniques as generally known in the art such calcination and / or impregnating first with the slurry catalyst prior to being fed into the upgrade system and / or mixed with the heavy oil feedstock.
- the additive material comprises activated carbon having large surface area, e.g., a pore area of at least 100 m 2 /g, and a pore diameter range between 100 to 400 Angstrom.
- the additive material is a commercially available powdered activated carbon from Norit as DARCO KB-GTM with a D-90 of 40 microns.
- the commercially available carbon material is DARCO INSULTM with a D-90 of 23 microns.
- the additive material comprises carbon black obtained by the coking of spent slurry catalyst in heavy oil residual from a metal recovery process to recover / separate metals from a spent slurry catalyst.
- the additive material serves a plurality of function, e.g., deposit trapping / metal scavenging and anti- foaming, deposit trapping / metal scavenging and mesophases suppressing, etc., with the use of a surface treated sacrificial material.
- the sacrificial material is surface treated (or coated) with at least an additive material such as an inhibitor and / or an anti-foam agent.
- the additive material is surface-modified carbon black.
- the surface treated carbon black contains reactive function groups on the surface that provide the anti-foam properties, and with the requisite surface area and pore size structure to trap and / or immobilize deposited coke and / or metals (Ni, V, Fe, Na) in the heavy oil feed.
- the additive is a surface-treated carbon black, with the carbon having been brought into contact with a heavy oil additive, e.g., a silicone compound such as dialkyl siloxane polymers, polydimethyl siloxane, polydiphenyl siloxane, polydiphenyl dimethyl siloxane, fluorinated siloxanes, and mixtures thereof.
- the multi-function additive is a sacrificial material surface treated with oil-soluble metal compounds such as carboxylic acids and salts of carboxylic acids, oil soluble polynuclear aromatic compounds, elastic modulus lowering agents, and other additive materials known in the art.
- oil-soluble metal compounds such as carboxylic acids and salts of carboxylic acids, oil soluble polynuclear aromatic compounds, elastic modulus lowering agents, and other additive materials known in the art.
- anti-foam agents e.g., silicone compounds, hydrocarbon-based anti-foam agents
- a carrier such as carbon black, titania, etc.
- the front-end contacting zone means the 1 st reactor in a system with a plurality of contacting zones operating in sequential mode (series).
- the first front-end contacting zone may include both first and second reactors.
- the first contacting zone means the 1 st reactor only.
- water is used to indicate either water and / or steam.
- water is optionally injected into the once-through upgrade system at a rate of about 1 to 25 wt. % (relative to the heavy oil feedstock).
- a sufficient amount of water is injected for a water concentration in the system in the range of 2 to 15 wt. %.
- a sufficient amount is injected for a water concentration in the range of 4 to 10 wt. %.
- the water can be added (injected) continually or intermittently as needed to control heavy metal deposit and / or improve the activity of the catalyst.
- the water can be added to the heavy oil feedstock before or after preheating.
- a substantial amount of water is added to the heavy oil feedstock admixture that is to be preheated, and a substantial amount of water is added directly to the front end contacting zone(s).
- water is added to the front-end contacting zone(s) via the heavy oil feedstock only.
- at least 50% of the water is added to the heavy oil feedstock mixture to be heated, and the rest of the water is added directly to the front end contacting zone(s).
- water is introduced to the system as part of the slurry catalyst feed. In one embodiment, water is added to the slurry catalyst feed and preconditioned along with the slurry catalyst and hydrogen, prior to being fed to the system along with the heavy oil feed, or as a separate feed stream.
- the water introduced into the system at the preheating stage (prior to the preheating of the heavy oil feedstock), in an amount of about 1 to about 25 wt. % of the incoming heavy oil feedstock.
- water is added to as part of the heavy oil feed to all of the contacting zones.
- water is added to the heavy oil feed to the first contacting zone only.
- water is added to the feed to the first two contacting zones only.
- water is added directly into the contacting zone at multiple points along the contacting zone, in ratio of 1 to 25 wt. % of the heavy oil feedstock.
- water is added directly into the first few contacting zones in the process which are the most prone to deposits of heavy metals.
- the water is added to the process in the form of dilution steam. In one embodiment, at least 30% of the water added is in the form of steam.
- the steam may be added at any point in the process. For example, it may be added to the heavy oil feedstock before or after preheating, to the catalyst / heavy oil mixture stream, and / or directly into the vapor phase of the contacting zones, or at multiple points along the first contacting zone.
- the dilution steam stream may comprise process steam or clean steam. The steam may be heated or superheated in a furnace prior to being fed into the upgrade process.
- the presence of the water in the process favorably alter the metallic compound sulfur molecular equilibrium, thus reducing the heavy metal deposit.
- the water / steam in the first contacting zone is expected to cut down on the heavy metal deposits onto the equipment.
- the addition of water is also believed to help control / maintain a desired temperature profile in the contacting zones.
- it is believed that the addition of water to the front end contacting zone(s) lowers the temperature of the reactor(s).
- the temperature of the first contacting zone can be kept at least 5 - 25 degrees (Fahrenheit) lower than the temperature of the next contacting zone in series.
- the addition of water reduces the heavy metal deposits in the reactor equipment at least 25% compared to an operation without the addition of water, for a comparable period of time in operation, e.g., for at least 2 months.
- the addition of water reduces heavy metal deposits at least 50% compared to an operation without the water addition.
- the addition of water reduces heavy metal deposits at least 75% compared to an operation without the water addition.
- additional hydrocarbon oil feed e.g., VGO (vacuum gas oil), naphtha, MCO (medium cycle oil), light cycle oil (LCO), heavy cycle oil (HCO), solvent donor, or other aromatic solvents, etc. in an amount ranging from 2 to 40 wt. % of the heavy oil feed, can be optionally added as part of the heavy oil feed stream to any of the contacting zones in the system.
- the additional hydrocarbon feed functions as a diluent to lower the viscosity of the heavy oil feed.
- Controlling Heavy Metal Deposit with Reactor Temperature In one embodiment, instead of and / or in addition to the addition of water to the front end contacting zone(s) in a sequential operation, the temperature of the front end contacting zone(s) most prone to heavy metal deposits is lowered.
- the temperature of the first reactor is set to be at least
- the first reactor temperature is set to be at least 15 0 F. (8.33 0 C.) than the next reactor in series.
- the temperature is set to be at least 2O 0 F. (11.11 0 C.) lower.
- the temperature is set to be at least 25 0 F. (13.89 0 C.) lower than the next reactor in series.
- System Performance In one embodiment of the once-through upgrade system and at a catalyst concentration substantially lower than in a prior art process with a recycle stream, e.g., at a concentration of less than 5000 wppm catalyst metal, at least 75 wt % of heavy oil feed is converted to lighter products in a high through-put one pass process (only one reactor is employed or multiple reactors are run in tandem / parallel). In another embodiment, a conversion rate of at least 80% is obtained with a slurry catalyst concentration in the range of 750 - 4000 wppm catalyst metal in a process with two reactors running in sequential mode.
- a concentration in the range of 1000 - 1500 wppm catalyst metal In one embodiment with three reactors in series, it was surprisingly found that the conversion rate was equal or better for the once-through upgrade system with substantially less catalyst concentration (e.g., 2500 ppm) than a system in the prior art with recycle and higher catalyst concentration (e.g., 4200 ppm).
- conversion rate refers to the conversion of heavy oil feedstock to less than 1000 0 F. (538°C) boiling point materials.
- At least 98% of heavy oil feed is converted to lighter products with less than 5000 wppm catalyst metal in a process with three reactors in series and no recycle.
- the conversion rate is at least 98% with less than 2500 wppm catalyst metal.
- the conversion rate is at least 80% with a slurry catalyst having a concentration of 1500 - 5000 wppm catalyst metal.
- the conversion rate is at least 95% with a slurry catalyst having a concentration of 1500 - 5000 wppm catalyst metal.
- the once-through upgrade system provides a sulfur conversion rate of at least 60%, a nitrogen conversion of at least 20%, and MCR conversion of at least 50% for a slurry catalyst concentration in the range of 750 - 5000 wppm catalyst metal.
- the once-through upgrade system produces a volume yield over 100% (compared to the heavy oil input) in upgraded products as added hydrogen expands the heavy oil total volume.
- the upgraded products e.g., lower boiling hydrocarbons, in one embodiment include liquefied petroleum gas (LPG), gasoline, diesel, vacuum gas oil (VGO), and jet and fuel oils.
- LPG liquefied petroleum gas
- VGO vacuum gas oil
- the upgrade system provides a volume yield of at least 110% in the form of LPG, naphtha, jet & fuel oils, and VGO.
- a volume yield of at least 115% is provided.
- the amount of heavier hydrocracked products in the non- volatile fraction stream is less than 50 wt. % (of the total weight of the non- volatile stream). In a second embodiment, the amount of heavier hydrocracked products in the non- volatile stream from the separation zone is less than 25 wt. %. In a third embodiment, the amount of heavier hydrocracked products in the non- volatile stream from the separation zone is less than 15 wt. %.
- the amount of solids in the residue stream varies depending on the conversion level as well as optional additive materials employed, if any, e.g., sacrificial materials.
- the solid level in the residue stream ranges from 1 to 10% solid in one embodiment, 2-5% solid in another embodiment, less than 30 wt. % solid in a third embodiment, and less than 40 wt. % solid in a fourth embodiment.
- FIG. 1 is a block diagram schematically illustrating an upgrade system 110 for upgrading heavy oil feedstock employing a slurry catalyst in once-through mode.
- a heavy oil feedstock 104 is introduced into the first contacting zone 120 in the system together with a slurry catalyst feed 110.
- the heavy oil feedstock 104 can be preheated in a heater (not shown) prior to feeding into the contacting zone.
- Hydrogen 121 may be introduced together with the heavy oil / slurry catalyst feed in the same conduit 122 as shown, or optionally, as a separate feed stream.
- water and / or steam may be introduced together with the feed and slurry catalyst in the same conduit or a separate feed stream.
- the mixture of water, heavy oil feed, and slurry catalyst can be preheated in a heater prior to feeding into the contacting zone.
- Additional hydrocarbon oil feed 105 e.g., VGO, naphtha, in an amount ranging from 2 to 30 wt. % of the heavy oil feed can be optionally added as part of the feed stream to any of the contacting zones in the system.
- more than half of the heavy oil feed is converted in the first contacting zone and at least 25% of the hydrogen feed is consumed in the first contacting zone.
- Effluent stream 123 comprising upgraded material, spent slurry catalyst, and unconverted heavy oil feed, hydrogen, etc., is withdrawn from the 1 st contacting zone 120 and sent to separation zone 130, e.g., a hot separator.
- separation zone 130 causes or allows the separation of gas and volatile liquids from the non- volatile fractions.
- the gaseous and volatile liquid fractions 131 are withdrawn from the top of the separation zone and taken for further processing in a lean contactor or a downstream process 160.
- the bottom stream 133 comprising slurry catalyst and entrained solids, coke, unconverted heavy oil feedstock, hydrocarbons newly generated in the hot separator, etc., are withdrawn and fed to the next contacting zone 140 in the series, resulting in additional reaction for more upgraded material.
- the effluent stream 123 bypasses the separation zone 130 and is sent directly to the next contacting zone 140 in series.
- additional portions of the fresh catalyst feed 110 and heavy oil feedstock 104 are fed directly into the contacting zone 140 in series as separate streams or a combined feed stream.
- optional hydrocarbon oil feedstock 105 such as VGO (vacuum gas oil) is also fed into next contacting zone 140.
- water and / or steam is also provided to the contacting zone 140 as a separate feed stream, or introduced together with the feed and slurry catalyst in the same conduit.
- Hydrogen 141 may be introduced together with the feed in the same conduit, or optionally, as a separate feed stream.
- at least a portion or all of the hydrogen feed is mixed with the liquid stream 133 from the separation zone and fed into the reactor 140.
- the quench hydrogen in one embodiment supplies the reaction hydrogen as most of the hydrogen from the first contacting zone 120 left with the vapor stream 131.
- Effluent stream 142 comprising upgraded materials along with slurry catalyst, hydrogen gas, coke, unconverted heavy oil, etc., flows to the next separation zone 150 in series for separation of gas and volatile liquids 151 from the non- volatile fractions 152.
- the gaseous and volatile liquid fractions are withdrawn from the top of the separation zone, and combined with the gaseous and volatile liquid fractions from a preceding separation zone as stream 161 for further processing in hydrotreatment system 160 or a downstream product purification system.
- the non-volatile (or less volatile) fraction stream is withdrawn and sent away as residue stream 152 for deoiling / metal recovery.
- stream 161 is quenched with a hydrocarbon stream such as LGO in a lean oil contactor.
- the hydrotreater 160 in one embodiment employs conventional hydrotreating catalysts, is operated at a similarly high pressure (within 10 psig) as the rest of the upgrade system, and capable of removing sulfur, nitrogen and other impurities from the upgraded products with an HDN conversion level of > 99.99%, lowering the sulfur level in fraction above 7O 0 F. boiling point in stream 162 to less than 20 ppm in one embodiment, and less than 10 ppm in a second embodiment.
- the in-line hydrotreater operates at a temperature within 1O 0 F. of the temperature of the contacting zones.
- FIG. 2 is a flow diagram of another embodiment of a once-through upgrade process with three contacting zones running in sequential mode, e.g., reactors 120, 135, and 140, with each of the contacting zones having a separation zone in series with optional bypass.
- effluent stream 123 comprising upgraded material, spent slurry catalyst, and unconverted heavy oil feed, hydrogen, etc., withdrawn from the 1 st contacting zone 120 is sent to separation zone 130, or directly to the second contacting zone 135 in series for further upgrading.
- the effluent stream 123 may bypass the separation zone 130 and go directly into the next contacting zone 135 in series.
- Additional catalyst feed, heavy oil feedstock and other hydrocarbon feedstock such as VGO can also be fed to the 2 nd contacting zone along with additional hydrogen feed 137.
- Effluent stream 136 exits the contacting zone 135 and flows to separation zone 145, wherein gases (including hydrogen) and upgraded products in the form of volatile liquids are separated from the nonvolatile liquid fraction 147 and removed overhead as stream 146.
- the non-volatile stream 147 is sent to the next contacting zone 140 in series for further upgrade.
- Non- volatile stream 147 contains slurry catalyst in combination with unconverted oil, heavier hydrocracked liquid products, optional sacrificial material, and small amounts of coke and asphaltenes in some embodiments continues on to the next reactor 140 as shown. Additional feed stream(s) comprising hydrogen comprising gas, optional VGO feed, optional (additional) heavy oil feed, and optional catalyst feed can be combined with the non-volatile stream 147 for further upgrade reaction in the next reactor 140. Effluent stream 142 from the reactor comprising upgraded heavy oil feedstock flows to separation zone 150, wherein upgraded products are combined with hydrogen and removed as overhead stream 151.
- FIG. 3 is a flow diagram of another embodiment of a once-through upgrade process as a parallel train with three contacting zones, e.g., reactors 120, 135, and 140, and with optional by-pass so that one separation zone can be used for all three reactors.
- the system is operated at a high through put rate with all three reactors operating in parallel with each reactor having its own heavy oil feed, catalyst feed, optional VGO feed, etc., with the effluents going to one same separator 150 or individually to separate reactors, and the non-volatile fractions from the separators are collected for further processing as residue 152.
- the system operates at a slower rate with at least two of the reactors operating in series, with the non- volatile fraction from the separator being sent to the next reactor in series.
- the effluent stream withdrawn from the reactor can be sent to the separator located in series after each reactor, e.g., streams 123 flowing to separator 130, stream 136 to separator 145, and stream 142 to separator 150, and the non-volatile streams from any of the separation zone can be removed / sent away to residue tank 152 for catalyst recovery / regeneration downstream.
- appropriate valves can be installed in the process pipes to open / close accordingly, allowing the once-through process system to switch from one operation mode to another.
- the different modes include but are not limited to the folio wings and combinations thereof: a) an operation with one reactor to two, or three (or more) reactors; b) an operation at low through-put rate but a high conversion rate with the plurality of reactors operating in a sequential fashion, i.e., operating in series, with the effluent from one reactor or the bottom liquid stream from a separator being sent to the next reactor in series for further conversion; c) an operation at a high through-put rate with at least some of the reactors running in tandem (parallel) and heavy oil feedstock to each of the reactors, and some of the reactor(s) being on stand-by or off-line mode; d) a mixed operation mode with one reactor running in tandem (parallel) with the other plurality of reactors running in series; e) an operation with the reactors running in tandem (parallel) with the effluent stream from each reactor being sent to a separator in series with the reactor(s); and f) an operation with the
- any of the reactor can be operated as a primary or only reactor, a first reactor (or a second reactor, a third reactor, etc.) in a process running in a sequential fashion (or a mixed sequential / tandem model), and any of the separation zone can be operated as a primary or only separator, a first (second, or third, etc.) separation zone or the only separation zone in continuous process.
- the process allows a flexible operation with different types of heavy oil feeds, catalyst types, etc., with the reactors running in parallel with their own feed system.
- the flexibility of running in parallel and or series also allows one reactor to be shut down for clean up, removal of deposits, etc., while the remainder of the system operational. This means that the overall operation process efficiency is increased with minimum overall system downtime.
- the process allows a flexible conversion from one operating mode to another, without the need for unit shut-down and re-start.
- the other reactor(s) are maintained in hot stand-by mode, i.e., at an elevated pressure and temperature as in the reactor(s) in operation.
- pressure and temperature are maintained in the equipment on standby with hot hydrogen being circulated through the reactor or reactors not in operation and kept on stand-by.
- a sufficient amount of heated hydrogen containing gas feed is supplied to each of the stand-by reactors for the reactors to be at approximately the same temperature and pressure as the reactors in operation.
- approximately the same (or similar to) temperature means that the temperature of the stand-by reactor is within 5O 0 F of the temperature of the reactors being in operation, and the pressure of the reactor on stand-by is within 100 psi of the pressure of the reactors in operation.
- the sufficient amount of hydrogen ranges from 10 to 100% of the hydrogen supplied to the reactor(s) in operation. In another embodiment, this sufficient amount of hydrogen ranges from 10 to 30%. In a fourth embodiment, the sufficient amount of hydrogen ranges from 15 to 25% of the total amount of hydrogen supplied to the reactors still in operation.
- the hot hydrogen stream exits the stand-by reactor or reactors and enters the separation zones, wherein it subsequently combines with the overhead stream and sent to a lean contactor or a downstream process for product purification.
- Figure 4 illustrates one embodiment of a flexible once-through upgrade process (a variation of Figure 3), wherein only two of the reactors 120 and 135 in the system are engaged for heavy oil upgrade, and the third reactor system 140 is put on stand-by or back up mode with H 2 feed only, or it can be used for the upgrade of heavy oil as shown (employing a different catalyst and / or heavy oil feedstock).
- the third reactor 140 system can also be shut-down for maintenance while the other two are kept on-line.
- reactors 120 and 135 are run in series, with the bottoms liquid stream 133 from the high pressure high temperature (HPHT) separator 130 is sent to reactor 135 for further upgrade.
- Volatile product streams from the overhead HPHT separators are combined with hot hydrogen 151 from the stand-by unit (or overhead stream with upgraded products if reactor 140 is in operation) and sent to a lean contactor or a downstream purification process.
- Bottoms stream comprising unconverted heavy oil, spent catalyst slurry, asphaltenes, etc. from the separator, e.g., 147 is collected as residue 152 and sent to a downstream process for deoiling and / or metal recovery in a metal recovery unit.
- Figure 5 illustrates another embodiment of the flexible once-through upgrade system (variation of Figure 3), wherein all units are engaged for heavy-oil upgrade to maximize through-put, running in parallel with heavy oil feed 104, slurry catalyst feed 110, optional steam injection to some of the reactors, optional additive materials such as anti-foam injection and / or sacrificial materials to some of the reactors, and optional VGO feed to some of the reactors running in tandem.
- effluents from any or all of the reactors can be directed to one single HPHT separator instead of running through a separator connected in series to the reactor, e.g., effluent streams 123 and 136 from reactors 120 and 140 respectively can be combined with the effluent stream 142 from the last reactor in the train, reactor 140, as feed to the HPHT separator 150.
- the bottom streams comprising unconverted heavy oil, spent catalyst, e.g., 133, 147 can be collected into one residue stream 152 and sent to a downstream process for deoiling and / or metal recovery in a metal recovery unit.
- the residue stream 152 contains small amounts of coke and asphaltenes, optional sacrificial material if any, and spent slurry catalyst in an amount of 5 to 30 wt. % in unconverted oil. Volatile product streams from the overhead HPHT separators are combined and sent to a lean contactor or a downstream product purification process.
- FIG. 6 is a flow diagram of another embodiment of a once-through upgrade process with three contacting zones running in tandem (parallel) and sharing one separation zone.
- each reactors 120, 135, and 140 run in tandem with their own separate heavy oil, catalyst, optional VGO, optional steam injection (not shown), and optional additive feeds (not shown).
- the effluent streams 123, 136, and 142 from the reactors are combined and sent to one single separation zone 150 for the upgraded products to be separated from the residue stream comprising spent slurry catalyst, heavier hydrocarbons, and unconverted heavy oil feed.
- the heavy oil feedstock as well as the catalyst feed can be the same or different across the reactors.
- Figure 7 is another permutation of the flexible upgrade system, wherein the first two reactors 120 and 135 run in sequential mode.
- additional heavy oil feed as well as catalyst, optional additives, VGO feed, etc. can also be added to the second reactor 135 along with the effluent stream 123 from the first reactor.
- the last reactor can be kept on stand-by mode with hot H 2 flowing through the reactor, or it can also be used for heavy oil upgrade as shown, with the last reactor 140 running in tandem with the sequential operation (reactors 120 and 135).
- the heavy oil feedstock, catalyst feed, and VGO feed to the last reactor 140 can be the same or different from the feeds to the sequential operation.
- effluent streams 136 and 142 from both operations are combined and sent to separation zone 150.
- the once-through upgrade system may comprise recirculating / recycling channels and pumps (not shown) for promoting the dispersion of reactants, catalyst, and heavy oil feedstock in the contacting zones, particularly with a high recirculation flow rate to the first contacting zone to induce turbulent mixing in the reactor, thus reducing heavy metal deposits.
- a recirculating pump circulates through the loop reactor, thus maintaining a temperature difference between the reactor feed point to the exit point ranging from 1 to 5O 0 F, or between 2-25 0 F.
- the recirculation is to limit the temperature difference across the contacting zone(s) due to exothermic reactions and ensure good contacting of the hydrogen and the reactants.
- a fresh slurry catalyst was prepared according to the teaching of US Patent No. 2006/0058174, e.g., a Mo compound was first mixed with aqueous ammonia forming an aqueous Mo compound mixture, sulf ⁇ ded with a sulfur-containing compound, promoted with a Ni compound, then transformed in a hydrocarbon oil, e.g., VGO, at a temperature of at least 35O 0 F and a pressure of at least 200 psig, forming an active slurry catalyst to send to the first reactor.
- a hydrocarbon oil e.g., VGO
- the Mo concentration in VGO is 5% and the Ni/Mo ratio is 10% wt.
- the heavy oil feedstock in the examples has properties as indicated in Table 1.
- the upgrade system was operated under two modes: recycle and once- through.
- recycle mode as in the prior art, a portion of the non- volatile stream (STB or "stripper bottoms" product) from the last reactor was recycled back to the 1 st reactor and a portion is removed as a bleed stream.
- the STB stream amounts to about 30% of heavy oil feedstock to the system.
- the bleed stream amounts to about 15 wt. % of the heavy oil feedstock to the system.
- the STB stream contains about 10 to 15 wt. % slurry catalyst.
- effluent taken from the 1 st reactor was sent to the 2 nd reactor to continue with the upgrade reaction.
- Effluent streams from the 2 nd and 3 rd reactors were sent to the separators connected in series to the 2 nd and 3 rd reactor respectively, and separated into a hot vapor stream and a non-volatile stream.
- Vapor streams (“HPO" or high-pressure overhead streams) were removed from the top of the high pressure separators and collected for further analysis.
- the non-volatile stream comprising slurry catalyst and unconverted heavy oil feedstock from the 1 st separator was sent to the 3 rd reactor.
- the non- volatile stream comprising slurry catalyst and unconverted heavy oil feedstock from the 2 nd (last) separator is the STB stream, which was either recycled to the 1 st reactor (for "recycle” experiments) or sent away as a residue stream (for "once-through” experiments).
- the hydroprocessing conditions were as follows: reactor temperature (in three reactors) in the range of 805 - 82O 0 F, with the average reactor temperature as indicated in the Tables; a total pressure in the range of 2400 to 2600 psig; LHSV is as indicated in the table, ranging from 0.1 to 0.30h “1; and H 2 gas rate (SCF/ bbl) of 7500 to 20000.
- reactor temperature in three reactors
- a total pressure in the range of 2400 to 2600 psig
- LHSV is as indicated in the table, ranging from 0.1 to 0.30h "1
- H 2 gas rate (SCF/ bbl) H 2 gas rate
- Example 8 in the once-through mode and at a low catalyst concentration (2500 ppm Mo/VR) gives a conversion rate that is comparable to the conversion rate obtained in Example Comp. 3, for an upgrade process operating in a recycle mode and a much higher catalyst concentration (4200 ppm).
- HVGO and VGO conversions were 93% and 78% respectively, along with high HDS, HDN, HD MCR and HDM conversions.
- the whole product API gravity gained nearly 31 degrees, similar to the recycle operation.
- Example 1 Results from Example 1, Comparative Example 1 and Comparative Example 2 were evaluated to compare the conversion rate at different through put rates and a high catalyst rate (2.1% Mo).
- the vacuum resid (VR) conversion rate decreased as expected at higher through put rates, but was still with a conversion rate of > 70% (71.74%). Additionally, more than 95% of the V and Ni in the feed were removed from the products and the whole product API gravity gained about 17 degrees compared to the VR feed.
- Examples 2-7 were to evaluate the once-through upgrade system at various through put rates and low catalyst concentration (1500-2500 ppm). As shown in Example 2, > 75% VR conversion was realized at 0.3 VR LHSV and 4200 ppm Mo.
- the HVGO and VGO conversion rates were 62% and 50% respectively, indicating that most of the VR have been converted to light hydrocarbon / oils.
- the catalyst level was reduced to 2500 ppm (Example 3) or 1500 ppm (Example 4)
- VR conversion increased slightly due to the slight decrease in the overall LHSV.
- the reactor temperature was increased from 818-819 0 F to 825 0 F
- the VR conversion rate increased to 79% with a low catalyst level of 2500 ppm Mo, which is a 40% reduction in catalyst usage compared to the usage in the recycle mode (Comparable Example 3).
- 92-94% VR conversion was obtained at 2500 ppm Mo with a whole product API gain of more than 26 degrees.
- Comparative Example 10 It is expected that running the upgrade system in the once-through mode with a very low catalyst concentration (250 ppm Mo/VR) would be unsuccessful, as the system would not stabilize with plugging problems, presumably with a low conversion rate due to the low catalyst concentration.
- Example 13 In this example, a sacrificial material was employed to test the absorbance of asphaltenes and other deposits in the upgrade system. A material with a high capacity to selectively adsorb troublesome asphaltenes was employed. The material adsorbed asphaltenes thus preventing the asphaltenes from deactivating the catalyst, allowing the system to run with less catalyst while still maintaining a high conversion.
- Example 13 [0163] In Example 13 (see table 4), two different sacrificial adsorbent materials were evaluated.
- C-2 is a commercial carbon black material from STREM Chemicals having an average size of 2-12 microns.
- C-I is a carbon black obtained by the coking of spent slurry catalyst in heavy oil residual obtained from a previous upgrade run, having a D-90 of 10 microns (with particle size ranging from 2 to 12 microns), and BET surface area of 400 m 2 /g.
- the carbonaceous material was charged at 3000 ppm Carbon/VR wt/wt in a batch reaction experiment with 112.5 g of a blend of heavy oil VR-I /cycle oil (3:2 ratio), and a catalyst level of 1.25% Mo to VR-I heavy oil feed.
- the reaction was carried out at a pressure of 1600 psig hydrogen and with 2 or 5 hour soak at 825 0 F.
- the runs with the carbonaceous material were compared to batch reaction experiments without the sacrificial adsorbent. Table 4 summarizes the catalytic performance.
- HDN means hydrodenitrogenation
- HDS means hydrodesulfurization
- HDMCR means hydrodemicrocarbon residue
- VR means vacuum residue
- at. H/C means atomic hydrogen to carbon ratio
- dry solids values were measured according to methods known in the art.
- HDN is a common measure for hydrogenation activity of a catalyst. As shown, runs employing carbonaceous sacrificial material showed a consistent increase in HDN activity at both 2 and 5 hour soak times compared to the control without the carbon.
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CN200980142583.9A CN102197115B (en) | 2008-09-18 | 2009-09-15 | Systems and methods for producing a crude product |
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JP2011527897A JP5764063B2 (en) | 2008-09-18 | 2009-09-15 | System and method for producing a crude product |
BRPI0918083A BRPI0918083A2 (en) | 2008-09-18 | 2009-09-15 | process for hydroprocessing a heavy oil feed load |
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CA2737386A1 (en) | 2010-03-25 |
CN102197115A (en) | 2011-09-21 |
KR20110076940A (en) | 2011-07-06 |
JP5764063B2 (en) | 2015-08-12 |
WO2010033487A8 (en) | 2010-06-03 |
EP2328995A2 (en) | 2011-06-08 |
CA2737386C (en) | 2017-04-18 |
KR101592856B1 (en) | 2016-02-12 |
EP2328995A4 (en) | 2012-05-30 |
MX2011002971A (en) | 2011-04-11 |
CN102197115B (en) | 2014-09-10 |
EA201170464A1 (en) | 2011-12-30 |
WO2010033487A9 (en) | 2010-09-16 |
JP2012503072A (en) | 2012-02-02 |
WO2010033487A3 (en) | 2010-07-01 |
BRPI0918083A2 (en) | 2015-12-01 |
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