US20150133706A1 - Methods of producing jet fuel from natural oil feedstocks through oxygen-cleaved reactions - Google Patents
Methods of producing jet fuel from natural oil feedstocks through oxygen-cleaved reactions Download PDFInfo
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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
- C10G3/00—Production of liquid hydrocarbon mixtures from oxygen-containing organic materials, e.g. fatty oils, fatty acids
- C10G3/50—Production of liquid hydrocarbon mixtures from oxygen-containing organic materials, e.g. fatty oils, fatty acids in the presence of hydrogen, hydrogen donors or hydrogen generating compounds
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- C10G31/09—Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for by filtration
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- C10G31/10—Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for with the aid of centrifugal force
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- C10G65/00—Treatment of hydrocarbon oils by two or more hydrotreatment processes only
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- C10G65/043—Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural serial stages only including only refining steps at least one step being a change in the structural skeleton
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- C10G67/00—Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one process for refining in the absence of hydrogen only
- C10G67/02—Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one process for refining in the absence of hydrogen only plural serial stages only
- C10G67/12—Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one process for refining in the absence of hydrogen only plural serial stages only including oxidation as the refining step in the absence of hydrogen
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- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/20—Characteristics of the feedstock or the products
- C10G2300/30—Physical properties of feedstocks or products
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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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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- C10L2200/00—Components of fuel compositions
- C10L2200/04—Organic compounds
- C10L2200/0461—Fractions defined by their origin
- C10L2200/0469—Renewables or materials of biological origin
- C10L2200/0484—Vegetable or animal oils
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- C10L2270/00—Specifically adapted fuels
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- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
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- C10L2290/543—Distillation, fractionation or rectification for separating fractions, components or impurities during preparation or upgrading of a fuel
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- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/54—Specific separation steps for separating fractions, components or impurities during preparation or upgrading of a fuel
- C10L2290/547—Filtration for separating fractions, components or impurities during preparation or upgrading of a fuel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P30/00—Technologies relating to oil refining and petrochemical industry
- Y02P30/20—Technologies relating to oil refining and petrochemical industry using bio-feedstock
Definitions
- This application relates to methods of producing jet fuel through oxygen-cleaved reactions of natural feedstocks.
- Ozonolysis is a chemical reaction generally known in the art.
- Ozonolysis is the reaction of an olefin with ozone in which the unsaturated carbon-carbon bond is cleaved and replaced with a double bond to oxygen, represented below in Equation I.
- R 1 , R 2 , R 3 , and R 4 are organic groups or hydrogen.
- Oxidative cleavage is also a chemical process that is generally known in the art. Examples for oxidative cleavage reaction conditions involving olefinic compounds are described in U.S. Pat. Nos. 5,596,111, and 5,939,572, herein incorporated by reference. In the oxidative cleavage reaction, carboxylic acids are prepared by reacting an olefinic compound with oxygen in the presence of a peroxide, solvent, and inorganic oxide catalyst, represented below in Equation II.
- R 1 , R 2 , R 3 , and R 4 are organic groups or hydrogen.
- Natural feedstocks of interest include, for example, natural oils (e.g., vegetable oils, fish oil, animal fats) and derivatives of natural oils, such as fatty acids and fatty acid alkyl (e.g., methyl) esters. These feedstocks may be converted into industrially useful chemicals (e.g., waxes, plastics, cosmetics, biofuels, etc.) by any number of different reactions.
- natural oils e.g., vegetable oils, fish oil, animal fats
- derivatives of natural oils such as fatty acids and fatty acid alkyl (e.g., methyl) esters.
- These feedstocks may be converted into industrially useful chemicals (e.g., waxes, plastics, cosmetics, biofuels, etc.) by any number of different reactions.
- Methods are disclosed for producing jet fuel from a natural oil through an oxygen-cleaved reaction, such as ozonolysis or oxidative cleavage.
- a feedstock comprising a natural oil is reacted with oxygen under conditions sufficient to form an oxygen-cleaved product.
- the method further comprises hydrogenating the oxygen-cleaved product under conditions sufficient to form a jet fuel composition.
- the method comprises reacting a feedstock comprising a natural oil, such as soybean oil, with ozone under conditions sufficient to form an ozone-cleaved product.
- the method further comprises hydrogenating the ozone-cleaved product under conditions sufficient to form a jet fuel composition.
- the method comprises reacting a feedstock comprising a natural oil, such as soybean oil, with oxygen under conditions sufficient to form an oxidative-cleaved product.
- the method further comprises hydrogenating the oxidative-cleaved product under conditions sufficient to form a jet fuel composition.
- FIG. 1 is a schematic diagram of a process to produce a jet fuel composition from a natural oil reacted with ozone.
- FIG. 2 is a schematic diagram of a process to produce a jet fuel composition from a natural oil reacted with oxygen gas.
- the present application relates to methods of producing jet fuel from natural oil feedstock.
- natural oil refers to an oil derived from a plant or animal source.
- natural oil includes natural oil derivatives, unless otherwise indicated.
- natural oils include, but are not limited to, vegetable oils, algae oils, animal fats, tall oils, derivatives of these oils, combinations of any of these oils, and the like.
- vegetable oils include canola oil, rapeseed oil, coconut oil, corn oil, cottonseed oil, olive oil, palm oil, peanut oil, safflower oil, sesame oil, soybean oil, sunflower oil, linseed oil, palm kernel oil, tung oil, jatropha oil, and castor oil.
- animal fats include lard, tallow, chicken fat, yellow grease, and fish oil.
- Tall oils are by-products of wood pulp manufacture.
- natural oil derivatives refers to the compounds or mixture of compounds derived from the natural oil using any one or combination of methods known in the chemical arts. Such methods include saponification, esterification, hydrogenation (partial or full), isomerization, oxidation, and reduction.
- the natural oil derivative may be a fatty acid methyl ester (FAME) derived from the glyceride of the natural oil.
- FAME fatty acid methyl ester
- Representative examples of natural oil derivatives include gums, phospholipids, soapstock, acidulated soapstock, distillate or distillate sludge, fatty acids and fatty acid alkyl (e.g., methyl) esters of the natural oil.
- the natural oil derivative may be a fatty acid methyl ester (FAME) derived from the glyceride of a natural oil.
- a feedstock includes canola or soybean oil, for example, refined, bleached, and deodorized soybean oil (i.e., RBD soybean oil).
- Soybean oil is an unsaturated polyol ester of glycerol that typically comprises about 95% weight or greater (e.g., 99% weight or greater) triglycerides of fatty acids.
- Major fatty acids in the polyol esters of soybean oil include saturated fatty acids, for example, palmitic acid (hexadecanoic acid) and stearic acid (octadecanoic acid), and unsaturated fatty acids, for example, oleic acid (9-octadecenoic acid), linoleic acid (9,12-octadecadienoic acid), and linolenic acid (9,12,15-octadecatrienoic acid).
- saturated fatty acids for example, palmitic acid (hexadecanoic acid) and stearic acid (octadecanoic acid)
- unsaturated fatty acids for example, oleic acid (9-octadecenoic acid), linoleic acid (9,12-octadecadienoic acid), and linolenic acid (9,12,15-octadecatrienoic acid).
- yield may refer to the total weight of jet fuel produced from the oxygen-cleaved and hydrogenation reactions. It may be defined in terms of a yield %, wherein the total weight of the jet fuel produced is divided by the total weight of the natural oil feedstock. It may also refer to the total weight of the jet fuel following a separation step and/or isomerization reaction.
- oxygen-cleaved product may refer to either an “ozone-cleaved product” or an “oxidative-cleaved product.”
- oxygen may refer to ozone (O 3 ), oxygen gas (O 2 ), or elemental oxygen (O).
- ozone-cleaved product refers to the product from the reaction of an olefin with ozone under conditions sufficient to have the unsaturated carbon-carbon bond cleaved and replaced with a double bond to oxygen.
- oxidative-cleaved product refers to the product from the reaction of an olefin with oxygen gas under conditions sufficient to have the unsaturated carbon-carbon bond cleaved and replaced with a double bound to oxygen or a carboxyl group.
- the term “isomerization,” “isomerize(s),” or “isomerizing” refers to the reaction and conversion of straight-chain hydrocarbon compounds, such as normal paraffins or normal olefins, into branched hydrocarbon compounds, such as iso-paraffins or iso-olefins.
- n-pentane may be isomerized into a mixture of n-pentane, 2-methylbutane, and 2,2-dimethylpropane.
- Isomerization of normal paraffins or normal olefins may be used to improve the overall properties of a fuel composition.
- yield may refer to the total weight of jet fuel produced from the oxygen-cleaved and hydrogenation reactions. It may also refer to the total weight of the jet fuel following a separation step and/or isomerization reaction. It may be defined in terms of a yield %, wherein the total weight of the jet fuel produced is divided by the total weight of the natural oil feedstock and low-weight olefin, combined.
- jet fuel or “aviation fuel” may refer to kerosene or naphtha-type fuel cuts, or military-grade jet fuel compositions.
- “Kerosene-type” jet fuel (including Jet A and Jet A-1) has a carbon number distribution between about 8 and 16. Jet A and Jet A-1 typically have a flash point between 38° C. and 66° C., an auto ignition temperature of approximately 210° C., a freeze point between approximately ⁇ 47° C. and ⁇ 40° C., a density of approximately 0.8 g/cc at 15° C., and an energy density of approximately 42.8-43.2 MJ/kg.
- Jet B “Naphtha-type” or “wide-cut” jet fuel (including Jet B) has a carbon number between about 5 and 15. Jet B typically comprises a flash point between approximately ⁇ 23° C. and 0° C., an auto ignition temperature of approximately 250° C., a freeze point of approximately ⁇ 65° C., a density of approximately 0.78 g/cc, and an energy density of approximately 42.8-43.5 MJ/kg. “Military grade” jet fuel refers to the Jet Propulsion or “JP” numbering system (JP-1, JP-2, JP-3, JP-4, JP-5, JP-6, JP-7, JP-8, etc.).
- Military grade jet fuels may comprise alternative or additional additives to have higher flash points than Jet A, Jet A-1, or Jet B in order to cope with heat and stress endured during supersonic flight.
- fuel compositions may generally refer to materials meeting required specifications or to blend components that are useful in formulating fuel compositions but, by themselves, do not meet all of the required specifications for a fuel.
- carbon number distribution may refer to the range of compounds present in a composition, wherein each compound is defined by the number of carbon atoms present.
- jet fuel typically comprises a distribution of hydrocarbon compounds wherein a majority of those compounds have between 5 and 16 carbon atoms each.
- the term “energy density” may refer to the amount of energy stored in a given system per unit mass (MJ/kg) or per unit volume (MJ/L).
- the energy density of jet fuel is typically greater than 40 MJ/kg.
- a high yield jet fuel composition can be created by reacting a natural oil with ozone.
- a natural oil 12 is combined with ozone 14 in a reactor 20 .
- Typical reaction conditions for ozonolysis are well-known in the art, as described in U.S. Pat. Nos. 3,481,954; 3,868,392; and 4,085,127, herein incorporated by reference.
- the natural oil preferably is a vegetable oil or vegetable oil derivative, such as soybean oil.
- the ozonolysis reaction in the reactor 20 produces an ozone-cleaved product 22 .
- Isomerization reactions are well-known in the art, as described in U.S. Pat. Nos. 3,150,205; 4,210,771; 5,095,169; and 6,214,764, herein incorporated by reference.
- An isomerization reaction at this stage may also crack some of the C 18+ compounds, and assist in producing a jet fuel composition having compounds within the desired carbon number range of 5 to 16.
- the ozone-cleaved product 22 is sent to a hydrogenation unit 30 . In certain embodiments, it is preferable to separate the byproducts from the ozone-cleaved product 22 prior to introduction to the hydrogenation unit 30 .
- hydrogen gas 24 is reacted with the ozone-cleaved product 22 in the hydrogenation unit 30 .
- the aldehydes from the ozone-cleaved products 22 are reduced by the hydrogen gas 24 .
- the natural oil esters, acids, and alcohols are reduced into hydrocarbons.
- the resulting hydrogenated product 32 includes hydrocarbons with a distribution preferably centered around approximately C 9 hydrocarbons.
- the hydrogenated product 32 may also contain byproducts from the hydrogenation and ozonolysis reactions, including water or heavy hydrocarbon chains (C 18+ ). Process conditions for the hydrogenation step are well-known in the art, as discussed in PCT/EP2007/009668.
- the hydrogenated product 32 may be used as a jet fuel composition. Alternatively, the hydrogenated product 32 may be sent to a separation unit 40 to remove any byproducts 44 (i.e. water, C 18+ ) from the desired jet fuel composition 42 . In one embodiment, the hydrogenated product 32 may be separated into a targeted jet fuel composition fraction 42 , a light-ends fraction (not shown), and a heavy-ends byproducts fraction, shown as 44 for this embodiment. The hydrogenated product 32 may contain byproducts from the ozonolysis reaction that would be separated at this stage if a separation step was not performed prior to the hydrogenation step. In one embodiment, distillation is used to separate the fractions.
- the heavy-ends byproducts fraction can be separated from the target jet fuel composition fraction by cooling the hydrogenated product 32 to approximately 38-66° C., or ⁇ 47-40° C., or ⁇ 65° C. and then removing the solid fraction by techniques known in the art such as filtration or centrifugation.
- ozonolysis of a natural oil can produce a jet fuel composition 42 having at least 20 wt % of C 9 compounds. More preferably, ozonolysis may lead to a jet fuel composition having at least 30, 40, or 50 wt % C 9 compounds. In these compositions, various performance parameters are targeted for specific types of jet fuel.
- a high yield jet fuel composition is created by reacting a natural oil with oxygen gas under conditions sufficient to cleave the natural oil olefins.
- Typical conditions for oxidative cleavage reactions are known in the art, as described in U.S. Pat. Nos. 5,596,111; 5,864,049; and 5,939,572, herein incorporated by reference.
- the natural oil 112 may be reacted with oxygen gas 114 in a reactor 120 in the presence of an organic solvent, an inorganic oxide catalyst, and a peroxidant such as hydrogen peroxide.
- the natural oil 112 preferably is a vegetable oil or vegetable oil derivative, such as soybean oil.
- the oxidative cleavage reaction in the reactor 120 produces an oxidative-cleaved product 122 .
- Isomerization reactions are well-known in the art, as described in U.S. Pat. Nos. 3,150,205; 4,210,771; 5,095,169; and 6,214,764, herein incorporated by reference.
- An isomerization reaction at this stage may also crack some of the C 18+ compounds, and assist in producing a jet fuel composition having compounds within the desired carbon number range of 5 to 16.
- the oxidative-cleaved product 122 is sent to a hydrogenation unit 130 . In certain embodiments, it is preferable to separate the byproducts from the oxidative-cleaved product 122 prior to introduction to the hydrogenation unit 130 .
- hydrogen gas 124 is reacted with the oxidative-cleaved product 122 .
- carboxylic acids and aldehydes from the oxidative-cleaved product 122 are reduced by the hydrogen gas 124 .
- the natural oil esters, acids, and alcohols are reduced into hydrocarbons.
- the resulting hydrogenated product 132 includes hydrocarbons with a distribution preferably centered at approximately C 9 hydrocarbons.
- the hydrogenated product 132 may also contain byproducts from the hydrogenation and oxidative-cleavage reactions, including water or heavy hydrocarbon chains (C 18+ ). Process conditions for the hydrogenation step are well-known in the art, as discussed in PCT/EP2007/009668.
- the hydrogenated product may function as a jet fuel composition.
- the hydrogenated product may be sent to a separation unit 140 to remove any byproducts 144 (i.e. water, C 18+ ) from the desired jet fuel composition 142 .
- the hydrogenated product 132 may be separated into a targeted jet fuel composition fraction 142 , a light-ends fraction (not shown), and a heavy-ends byproducts fraction shown as 144 for this embodiment.
- the hydrogenated product may contain byproducts from the oxidative-cleavage reaction that would be separated at this stage if a separation step was not performed prior to the hydrogenation step.
- distillation may be used to separate the fractions.
- the heavy-ends byproducts fraction can be separated from the target jet fuel composition fraction by cooling the hydrogenated product 132 to approximately 38-66° C., or ⁇ 47-40° C., or ⁇ 65° C. and then removing the solid fraction by techniques known in the art such as filtration or centrifugation.
- based upon the quality of the hydrogenated product 132 or the jet fuel composition 142 there may be a need for further processing to target the desired jet fuel properties like the flash point, freeze point, or energy density. For instance, there may be a need to isomerize the n-paraffin hydrocarbons in the hydrogenated product 132 or jet fuel composition 142 , and produce a mixture of n-paraffin and iso-paraffin compounds.
- Oxidative-cleavage of certain natural oils can produce a jet fuel composition having at least 40 wt % of C 9 compounds, as shown in the table below.
- the jet fuel composition may comprise more than 50 wt % of C 12 compounds.
- various performance parameters are targeted for specific types of jet fuel.
- the natural oil is converted into a kerosene-type jet fuel comprising a carbon number distribution between 8 and 16 carbon numbers.
- This kerosene-type jet fuel distribution includes Jet A or Jet A-1.
- Kerosene-type jet fuel is targeted by reacting the natural oil with ozone to achieve desired jet fuel properties as well as a desired distribution between C 8 and C 16 .
- the natural oil is converted into a naphtha-type jet fuel comprising a carbon number distribution between 5 and 15 carbon numbers.
- This naphtha-type jet fuel distribution includes Jet B.
- Naphtha-type jet fuel is targeted by reacting the natural oil with ozone to achieve desired jet fuel properties as well as a desired distribution between C 5 and C 15 .
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Abstract
Methods are provided for producing a jet fuel composition from a feedstock comprising a natural oil. The methods comprise reacting the feedstock with oxygen under conditions sufficient to form an oxygen-cleaved product. The methods further comprise hydrogenating the oxygen-cleaved product under conditions sufficient to form a jet fuel composition.
Description
- This application is a continuation of U.S. Ser. No. 13/129,172, which was filed May 13, 2011, which claims the benefit under 35 U.S.C. §371 of International Application No. PCT/US2009/065858, filed Nov. 25, 2009, and entitled METHODS OF PRODUCING JET FUEL FROM NATURAL OIL FEEDSTOCKS THROUGH OXYGEN-CLEAVED REACTIONS, which claims the benefit of U.S. Provisional Application having Ser. No. 61/118,344, filed Nov. 26, 2008, and entitled METHODS OF PRODUCING JET FUEL FROM NATURAL OIL FEESTOCKS, the disclosures of which are incorporated herein by reference.
- This application relates to methods of producing jet fuel through oxygen-cleaved reactions of natural feedstocks.
- Ozonolysis is a chemical reaction generally known in the art. Ozonolysis is the reaction of an olefin with ozone in which the unsaturated carbon-carbon bond is cleaved and replaced with a double bond to oxygen, represented below in Equation I.
- wherein R1, R2, R3, and R4 are organic groups or hydrogen.
- Oxidative cleavage is also a chemical process that is generally known in the art. Examples for oxidative cleavage reaction conditions involving olefinic compounds are described in U.S. Pat. Nos. 5,596,111, and 5,939,572, herein incorporated by reference. In the oxidative cleavage reaction, carboxylic acids are prepared by reacting an olefinic compound with oxygen in the presence of a peroxide, solvent, and inorganic oxide catalyst, represented below in Equation II.
- wherein R1, R2, R3, and R4 are organic groups or hydrogen.
- In recent years, there has been an increased demand for environmentally friendly techniques for manufacturing materials typically derived from petroleum sources. For example, researchers have been studying the feasibility of manufacturing biofuels, waxes, plastics, and the like, using natural feedstocks, such as vegetable and seed-based oils.
- Natural feedstocks of interest include, for example, natural oils (e.g., vegetable oils, fish oil, animal fats) and derivatives of natural oils, such as fatty acids and fatty acid alkyl (e.g., methyl) esters. These feedstocks may be converted into industrially useful chemicals (e.g., waxes, plastics, cosmetics, biofuels, etc.) by any number of different reactions.
- In recent years, there has been an increased demand for petroleum-based transportation fuels. Concerns exist that the world's petroleum production may not be able to keep up with demand. Additionally, the increased demand for petroleum-based fuels has resulted in a higher production of greenhouse gases. In particular, the airline industry accounts for greater than 10% of the greenhouse gases within the United States. Due to the increased demand for fuel and increased production of greenhouse gases, there is a need to explore methods of producing environmentally-friendly, alternative fuel sources. In particular, there is a need to explore methods of producing environmentally friendly jet fuel from a natural feedstock.
- Methods are disclosed for producing jet fuel from a natural oil through an oxygen-cleaved reaction, such as ozonolysis or oxidative cleavage.
- In accordance with the present invention, a feedstock comprising a natural oil is reacted with oxygen under conditions sufficient to form an oxygen-cleaved product. The method further comprises hydrogenating the oxygen-cleaved product under conditions sufficient to form a jet fuel composition.
- In one aspect, the method comprises reacting a feedstock comprising a natural oil, such as soybean oil, with ozone under conditions sufficient to form an ozone-cleaved product. The method further comprises hydrogenating the ozone-cleaved product under conditions sufficient to form a jet fuel composition.
- In another aspect, the method comprises reacting a feedstock comprising a natural oil, such as soybean oil, with oxygen under conditions sufficient to form an oxidative-cleaved product. The method further comprises hydrogenating the oxidative-cleaved product under conditions sufficient to form a jet fuel composition.
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FIG. 1 is a schematic diagram of a process to produce a jet fuel composition from a natural oil reacted with ozone. -
FIG. 2 is a schematic diagram of a process to produce a jet fuel composition from a natural oil reacted with oxygen gas. - The present application relates to methods of producing jet fuel from natural oil feedstock.
- As used herein, the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. For example, reference to “a substituent” encompasses a single substituent as well as two or more substituents, and the like.
- As used herein, the terms “for example,” “for instance,” “such as,” or “including” are meant to introduce examples that further clarify more general subject matter. Unless otherwise specified, these examples are provided only as an aid for understanding the applications illustrated in the present disclosure, and are not meant to be limiting in any fashion.
- As used herein, the terms “natural oil,” “natural feedstock,” or “natural oil feedstock” refer to an oil derived from a plant or animal source. The term “natural oil” includes natural oil derivatives, unless otherwise indicated. Examples of natural oils include, but are not limited to, vegetable oils, algae oils, animal fats, tall oils, derivatives of these oils, combinations of any of these oils, and the like. Representative examples of vegetable oils include canola oil, rapeseed oil, coconut oil, corn oil, cottonseed oil, olive oil, palm oil, peanut oil, safflower oil, sesame oil, soybean oil, sunflower oil, linseed oil, palm kernel oil, tung oil, jatropha oil, and castor oil. Representative examples of animal fats include lard, tallow, chicken fat, yellow grease, and fish oil. Tall oils are by-products of wood pulp manufacture.
- As used herein, the term “natural oil derivatives” refers to the compounds or mixture of compounds derived from the natural oil using any one or combination of methods known in the chemical arts. Such methods include saponification, esterification, hydrogenation (partial or full), isomerization, oxidation, and reduction. For example, the natural oil derivative may be a fatty acid methyl ester (FAME) derived from the glyceride of the natural oil. Representative examples of natural oil derivatives include gums, phospholipids, soapstock, acidulated soapstock, distillate or distillate sludge, fatty acids and fatty acid alkyl (e.g., methyl) esters of the natural oil. For example, the natural oil derivative may be a fatty acid methyl ester (FAME) derived from the glyceride of a natural oil. In some preferred embodiments, a feedstock includes canola or soybean oil, for example, refined, bleached, and deodorized soybean oil (i.e., RBD soybean oil). Soybean oil is an unsaturated polyol ester of glycerol that typically comprises about 95% weight or greater (e.g., 99% weight or greater) triglycerides of fatty acids. Major fatty acids in the polyol esters of soybean oil include saturated fatty acids, for example, palmitic acid (hexadecanoic acid) and stearic acid (octadecanoic acid), and unsaturated fatty acids, for example, oleic acid (9-octadecenoic acid), linoleic acid (9,12-octadecadienoic acid), and linolenic acid (9,12,15-octadecatrienoic acid).
- As used herein, the term “yield” may refer to the total weight of jet fuel produced from the oxygen-cleaved and hydrogenation reactions. It may be defined in terms of a yield %, wherein the total weight of the jet fuel produced is divided by the total weight of the natural oil feedstock. It may also refer to the total weight of the jet fuel following a separation step and/or isomerization reaction.
- As used herein, the term “oxygen-cleaved product” may refer to either an “ozone-cleaved product” or an “oxidative-cleaved product.”
- As used herein, the term “oxygen” may refer to ozone (O3), oxygen gas (O2), or elemental oxygen (O).
- As used herein, the term “ozone-cleaved product” refers to the product from the reaction of an olefin with ozone under conditions sufficient to have the unsaturated carbon-carbon bond cleaved and replaced with a double bond to oxygen.
- As used herein, the term “oxidative-cleaved product” refers to the product from the reaction of an olefin with oxygen gas under conditions sufficient to have the unsaturated carbon-carbon bond cleaved and replaced with a double bound to oxygen or a carboxyl group.
- As used herein, the term “isomerization,” “isomerize(s),” or “isomerizing” refers to the reaction and conversion of straight-chain hydrocarbon compounds, such as normal paraffins or normal olefins, into branched hydrocarbon compounds, such as iso-paraffins or iso-olefins. For example, n-pentane may be isomerized into a mixture of n-pentane, 2-methylbutane, and 2,2-dimethylpropane. Isomerization of normal paraffins or normal olefins may be used to improve the overall properties of a fuel composition.
- As used herein, the term “yield” may refer to the total weight of jet fuel produced from the oxygen-cleaved and hydrogenation reactions. It may also refer to the total weight of the jet fuel following a separation step and/or isomerization reaction. It may be defined in terms of a yield %, wherein the total weight of the jet fuel produced is divided by the total weight of the natural oil feedstock and low-weight olefin, combined.
- As used herein, the term “jet fuel” or “aviation fuel” may refer to kerosene or naphtha-type fuel cuts, or military-grade jet fuel compositions. “Kerosene-type” jet fuel (including Jet A and Jet A-1) has a carbon number distribution between about 8 and 16. Jet A and Jet A-1 typically have a flash point between 38° C. and 66° C., an auto ignition temperature of approximately 210° C., a freeze point between approximately −47° C. and −40° C., a density of approximately 0.8 g/cc at 15° C., and an energy density of approximately 42.8-43.2 MJ/kg. “Naphtha-type” or “wide-cut” jet fuel (including Jet B) has a carbon number between about 5 and 15. Jet B typically comprises a flash point between approximately −23° C. and 0° C., an auto ignition temperature of approximately 250° C., a freeze point of approximately −65° C., a density of approximately 0.78 g/cc, and an energy density of approximately 42.8-43.5 MJ/kg. “Military grade” jet fuel refers to the Jet Propulsion or “JP” numbering system (JP-1, JP-2, JP-3, JP-4, JP-5, JP-6, JP-7, JP-8, etc.). Military grade jet fuels may comprise alternative or additional additives to have higher flash points than Jet A, Jet A-1, or Jet B in order to cope with heat and stress endured during supersonic flight. Additionally, fuel compositions may generally refer to materials meeting required specifications or to blend components that are useful in formulating fuel compositions but, by themselves, do not meet all of the required specifications for a fuel.
- As used herein, the term “carbon number distribution” may refer to the range of compounds present in a composition, wherein each compound is defined by the number of carbon atoms present. For example, jet fuel typically comprises a distribution of hydrocarbon compounds wherein a majority of those compounds have between 5 and 16 carbon atoms each.
- As used herein, the term “energy density” may refer to the amount of energy stored in a given system per unit mass (MJ/kg) or per unit volume (MJ/L). For example, the energy density of jet fuel is typically greater than 40 MJ/kg.
- In accordance with the present invention, in one embodiment, a high yield jet fuel composition can be created by reacting a natural oil with ozone.
- As shown in
FIG. 1 , anatural oil 12 is combined withozone 14 in areactor 20. Typical reaction conditions for ozonolysis are well-known in the art, as described in U.S. Pat. Nos. 3,481,954; 3,868,392; and 4,085,127, herein incorporated by reference. The natural oil preferably is a vegetable oil or vegetable oil derivative, such as soybean oil. - The ozonolysis reaction in the
reactor 20 produces an ozone-cleavedproduct 22. In one embodiment, based upon the quality of the ozone-cleavedproduct 22, it is preferable to isomerize the ozone-cleavedproduct 22 to assist in targeting the desired jet fuel properties like the flash point, freeze point, or energy density. Isomerization reactions are well-known in the art, as described in U.S. Pat. Nos. 3,150,205; 4,210,771; 5,095,169; and 6,214,764, herein incorporated by reference. An isomerization reaction at this stage may also crack some of the C18+ compounds, and assist in producing a jet fuel composition having compounds within the desired carbon number range of 5 to 16. - In one embodiment, the ozone-cleaved
product 22 is sent to ahydrogenation unit 30. In certain embodiments, it is preferable to separate the byproducts from the ozone-cleavedproduct 22 prior to introduction to thehydrogenation unit 30. - In the hydrogenation unit,
hydrogen gas 24 is reacted with the ozone-cleavedproduct 22 in thehydrogenation unit 30. During hydrogenation, the aldehydes from the ozone-cleavedproducts 22 are reduced by thehydrogen gas 24. Additionally, the natural oil esters, acids, and alcohols are reduced into hydrocarbons. The resultinghydrogenated product 32 includes hydrocarbons with a distribution preferably centered around approximately C9 hydrocarbons. Thehydrogenated product 32 may also contain byproducts from the hydrogenation and ozonolysis reactions, including water or heavy hydrocarbon chains (C18+). Process conditions for the hydrogenation step are well-known in the art, as discussed in PCT/EP2007/009668. - The
hydrogenated product 32 may be used as a jet fuel composition. Alternatively, thehydrogenated product 32 may be sent to aseparation unit 40 to remove any byproducts 44 (i.e. water, C18+) from the desiredjet fuel composition 42. In one embodiment, thehydrogenated product 32 may be separated into a targeted jetfuel composition fraction 42, a light-ends fraction (not shown), and a heavy-ends byproducts fraction, shown as 44 for this embodiment. Thehydrogenated product 32 may contain byproducts from the ozonolysis reaction that would be separated at this stage if a separation step was not performed prior to the hydrogenation step. In one embodiment, distillation is used to separate the fractions. Alternatively, the heavy-ends byproducts fraction can be separated from the target jet fuel composition fraction by cooling thehydrogenated product 32 to approximately 38-66° C., or −47-40° C., or −65° C. and then removing the solid fraction by techniques known in the art such as filtration or centrifugation. - In another embodiment, based upon the quality of the
hydrogenated product 32 or thejet fuel composition 42, there may be a need for further processing to target the desired jet fuel properties like the flash point, freeze point, or energy density. For instance, there may be a need to isomerize the n-paraffin hydrocarbons in thehydrogenated product 32 orjet fuel composition 42, and produce a mixture of n-paraffin and iso-paraffin compounds. Isomerization reactions are well-known in the art, as described in U.S. Pat. Nos. 3,150,205; 4,210,771; 5,095,169; and 6,214,764, herein incorporated by reference. - In one embodiment, ozonolysis of a natural oil can produce a
jet fuel composition 42 having at least 20 wt % of C9 compounds. More preferably, ozonolysis may lead to a jet fuel composition having at least 30, 40, or 50 wt % C9 compounds. In these compositions, various performance parameters are targeted for specific types of jet fuel. - In another embodiment, as shown in
FIG. 2 , a high yield jet fuel composition is created by reacting a natural oil with oxygen gas under conditions sufficient to cleave the natural oil olefins. Typical conditions for oxidative cleavage reactions are known in the art, as described in U.S. Pat. Nos. 5,596,111; 5,864,049; and 5,939,572, herein incorporated by reference. For example, thenatural oil 112 may be reacted withoxygen gas 114 in areactor 120 in the presence of an organic solvent, an inorganic oxide catalyst, and a peroxidant such as hydrogen peroxide. Thenatural oil 112 preferably is a vegetable oil or vegetable oil derivative, such as soybean oil. - The oxidative cleavage reaction in the
reactor 120 produces an oxidative-cleavedproduct 122. In one embodiment, based upon the quality of the oxidative-cleavedproduct 122, it is preferable to isomerize the oxidative-cleavedproduct 122 to assist in targeting the desired jet fuel properties like the flash point, freeze point, or energy density. Isomerization reactions are well-known in the art, as described in U.S. Pat. Nos. 3,150,205; 4,210,771; 5,095,169; and 6,214,764, herein incorporated by reference. An isomerization reaction at this stage may also crack some of the C18+ compounds, and assist in producing a jet fuel composition having compounds within the desired carbon number range of 5 to 16. - In one embodiment, the oxidative-cleaved
product 122 is sent to ahydrogenation unit 130. In certain embodiments, it is preferable to separate the byproducts from the oxidative-cleavedproduct 122 prior to introduction to thehydrogenation unit 130. - In the
hydrogenation unit 130,hydrogen gas 124 is reacted with the oxidative-cleavedproduct 122. During hydrogenation, carboxylic acids and aldehydes from the oxidative-cleavedproduct 122 are reduced by thehydrogen gas 124. Additionally, the natural oil esters, acids, and alcohols are reduced into hydrocarbons. The resultinghydrogenated product 132 includes hydrocarbons with a distribution preferably centered at approximately C9 hydrocarbons. Thehydrogenated product 132 may also contain byproducts from the hydrogenation and oxidative-cleavage reactions, including water or heavy hydrocarbon chains (C18+). Process conditions for the hydrogenation step are well-known in the art, as discussed in PCT/EP2007/009668. - The hydrogenated product may function as a jet fuel composition. Alternatively, the hydrogenated product may be sent to a
separation unit 140 to remove any byproducts 144 (i.e. water, C18+) from the desiredjet fuel composition 142. In one embodiment, thehydrogenated product 132 may be separated into a targeted jetfuel composition fraction 142, a light-ends fraction (not shown), and a heavy-ends byproducts fraction shown as 144 for this embodiment. The hydrogenated product may contain byproducts from the oxidative-cleavage reaction that would be separated at this stage if a separation step was not performed prior to the hydrogenation step. In one embodiment, distillation may be used to separate the fractions. Alternatively, the heavy-ends byproducts fraction can be separated from the target jet fuel composition fraction by cooling thehydrogenated product 132 to approximately 38-66° C., or −47-40° C., or −65° C. and then removing the solid fraction by techniques known in the art such as filtration or centrifugation. - In another embodiment, based upon the quality of the
hydrogenated product 132 or thejet fuel composition 142, there may be a need for further processing to target the desired jet fuel properties like the flash point, freeze point, or energy density. For instance, there may be a need to isomerize the n-paraffin hydrocarbons in thehydrogenated product 132 orjet fuel composition 142, and produce a mixture of n-paraffin and iso-paraffin compounds. - Oxidative-cleavage of certain natural oils can produce a jet fuel composition having at least 40 wt % of C9 compounds, as shown in the table below. Alternatively, for certain natural oils, the jet fuel composition may comprise more than 50 wt % of C12 compounds. In these compositions, various performance parameters are targeted for specific types of jet fuel.
- In one embodiment, the natural oil is converted into a kerosene-type jet fuel comprising a carbon number distribution between 8 and 16 carbon numbers. This kerosene-type jet fuel distribution includes Jet A or Jet A-1. In this embodiment, it is preferable to have a flash point between approximately 38° C. and 66° C. It is also preferable to have an auto ignition temperature of approximately 210° C. It is also preferable to have a freeze point between approximately −47° C. and −40° C. (closer to −47° C. for a Jet A-1 type fuel and closer to −40° C. for a Jet A type fuel). It is also preferable to have a density of approximately 0.8 g/cc at 15° C. It is also preferable to have an energy density greater than 40 MJ/kg. It is more preferable to have an energy density between 42 and 48 MJ/kg. It is even more preferable to have an energy density for kerosene-type jet fuel of approximately 42.8-43.2 MJ/kg.
- Kerosene-type jet fuel is targeted by reacting the natural oil with ozone to achieve desired jet fuel properties as well as a desired distribution between C8 and C16.
- In another embodiment, the natural oil is converted into a naphtha-type jet fuel comprising a carbon number distribution between 5 and 15 carbon numbers. This naphtha-type jet fuel distribution includes Jet B. In this embodiment, it is preferable to have a flash point between approximately −23° C. and 0° C. It is also preferable to have an auto ignition temperature of approximately 250° C. It is also preferable to have a freeze point of approximately −65° C. It is also preferable to have a density of approximately 0.78 g/cc at 15° C. It is also preferable to have an energy density greater than 40 MJ/kg. It is more preferable to have an energy density between 42 and 48 MJ/kg. It is even more preferable to have an energy density for naphtha-type jet fuel of approximately 42.8-43.5 MJ/kg.
- Naphtha-type jet fuel is targeted by reacting the natural oil with ozone to achieve desired jet fuel properties as well as a desired distribution between C5 and C15.
- The invention will now be described with reference to the following non-limiting example.
- Various natural oils are reacted with oxygen gas under conditions sufficient to convert the natural oils into carboxylic acids and aldehydes via an oxidative cleavage reaction. The oxidative-cleaved product is then reacted with hydrogen gas under conditions sufficient to convert the oxidative-cleaved product into hydrocarbons. The distribution of hydrocarbons from each natural oil is shown in the table below, as compared to a typical jet fuel distribution from fossil fuels.
-
TABLE Natural oil C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14+ Canola oil 0.0 0.0 6.9 0.0 0.0 85.7 0.0 0.6 0.0 0.0 6.8 Chicken fat 0.0 0.0 7.0 0.0 0.0 61.0 0.0 0.0 0.2 0.0 31.8 Coconut oil 0.0 0.0 1.2 0.0 9.0 9.4 7.5 0.0 58.9 0.0 13.9 Corn oil 0.0 0.0 21.4 0.0 0.0 62.9 0.0 0.0 0.0 0.0 15.7 Cottonseed oil 0.0 0.0 20.2 0.0 0.0 50.3 0.0 0.0 0.0 0.0 29.5 Lard 0.0 0.0 3.6 0.0 0.0 56.3 0.1 0.8 0.1 0.0 39.1 Linseed oil 0.0 0.0 7.8 0.0 0.0 78.8 0.0 0.0 0.0 0.0 13.4 Palm oil 0.0 0.0 3.3 0.0 0.0 45.6 0.0 0.0 0.3 0.0 50.8 Palm kernel oil 0.0 0.0 1.2 0.0 4.3 18.5 4.6 0.0 58.5 0.0 12.9 Peanut oil 0.0 0.0 11.8 0.0 0.0 69.8 0.0 0.9 0.0 0.0 17.5 Rapeseed oil (erucic) 0.0 0.0 6.4 0.0 0.0 52.1 0.0 8.6 0.0 26.9 6.1 Rice bran oil 0.0 0.0 12.4 0.0 0.1 66.8 0.1 0.2 0.4 0.0 20.0 Safflower oil 0.0 0.0 30.1 0.0 0.0 59.8 0.0 0.0 0.0 0.0 10.2 Safflower oil (high 0.0 0.0 4.2 0.0 0.0 87.9 0.0 0.0 0.0 0.0 7.9 oleic) Soybean oil 0.0 0.0 20.7 0.0 0.0 62.2 0.0 0.0 0.0 0.0 17.1 Sunflower oil 0.0 0.0 26.1 0.0 0.0 60.2 0.0 0.0 0.5 0.0 13.2 Tallow (beef) 0.0 0.0 0.8 0.0 0.0 47.1 0.1 0.0 0.1 0.0 51.8 Tallow mutton 0.0 0.0 1.6 0.0 0.0 43.3 0.2 0.0 0.3 0.0 54.6 Jet fuel derived 0 0.1 0.2 1.75 4 5 8.2 11.75 9 4 56 from fossil fuel - While the invention as described may have modifications and alternative forms, various embodiments thereof have been described in detail. Further, while the present invention has been described in terms of non-limiting examples, it will be understood, of course, that the invention is not limited thereto since modifications may be made to those skilled in the art, particularly in light of the foregoing teachings.
Claims (13)
1-17. (canceled)
18. A method of producing a jet fuel composition comprising:
providing a natural oil comprising carbon-carbon double bonds;
reacting the natural oil with ozone to provide an ozone-cleaved product, wherein the ozone-cleaved product comprises C9 aldehydes; and
hydrogenating the ozone-cleaved product to provide a hydrogenated product comprising a jet fuel composition and at least one byproduct, wherein the hydrogenated product comprises C9 hydrocarbons formed from the hydrogenation of the C9 aldehydes, and wherein the hydrogenated product comprises at least 40 wt % C9 hydrocarbon compounds.
19. The method of claim 18 , wherein the jet fuel composition has an energy density of greater than 40 MJ/kg.
20. The method of claim 18 , further comprising isomerizing the ozone-cleaved product prior to the hydrogenating.
21. The method of claim 18 , further comprising isomerizing the jet fuel composition, wherein a fraction of normal-paraffin compounds in the jet fuel composition are isomerized into iso-paraffin compounds.
22. The method of claim 18 , further comprising separating C18+ compounds and water from the jet fuel composition.
23. The method of claim 22 , wherein the C18+ compounds are removed by at least one of the following: distillation, filtration, or centrifugation.
24. The method of claim 22 , wherein the jet fuel composition is a kerosene-type jet fuel having a carbon number distribution from 8 to 16 carbon atoms.
25. The method of claim 24 , wherein the kerosene-type jet fuel has:
a flash point between 38° C. and 66° C.;
an auto ignition temperature of 210° C.; and
a freeze point between −47° C. and −40° C.
26. The method of claim 22 , wherein the jet fuel composition is a naphtha-type jet fuel having a carbon number distribution from 5 to 15 carbon atoms.
27. The method of claim 26 , wherein the naphtha-type jet fuel has:
a flash point between −23° C. and 0° C.;
an auto ignition temperature of 250 ° C.; and
a freeze point of −65° C.
28. The method of claim 18 , wherein the natural oil is selected from the group consisting of algae oil, canola oil, rapeseed oil, coconut oil, corn oil, cottonseed oil, olive oil, palm oil, peanut oil, safflower oil, sesame oil, soybean oil, sunflower oil, linseed oil, palm kernel oil, tung oil, jatropha oil, castor oil, and natural oil derivatives of any one or more of these.
29. The method of claim 18 , wherein the natural oil is soybean oil, a derivative of soybean oil, or combination thereof.
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US8889932B2 (en) | 2014-11-18 |
CN102227489B (en) | 2015-04-15 |
CA2742793C (en) | 2016-05-10 |
MX2011005525A (en) | 2011-06-06 |
CA2742793A1 (en) | 2010-06-03 |
US20110230687A1 (en) | 2011-09-22 |
CN102227489A (en) | 2011-10-26 |
WO2010062932A1 (en) | 2010-06-03 |
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