EP2593534A2 - Improved method of removing hydrogen sulfide - Google Patents

Improved method of removing hydrogen sulfide

Info

Publication number
EP2593534A2
EP2593534A2 EP11807421.0A EP11807421A EP2593534A2 EP 2593534 A2 EP2593534 A2 EP 2593534A2 EP 11807421 A EP11807421 A EP 11807421A EP 2593534 A2 EP2593534 A2 EP 2593534A2
Authority
EP
European Patent Office
Prior art keywords
nitroxide
scavenger
promoter
hydrogen sulfide
methyltriazine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11807421.0A
Other languages
German (de)
French (fr)
Other versions
EP2593534A4 (en
Inventor
Dennis R. Compton
J. Byron Strickland
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ChampionX LLC
Original Assignee
Nalco Co LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nalco Co LLC filed Critical Nalco Co LLC
Publication of EP2593534A2 publication Critical patent/EP2593534A2/en
Publication of EP2593534A4 publication Critical patent/EP2593534A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C10G29/00—Refining of hydrocarbon oils, in the absence of hydrogen, with other chemicals
    • C10G29/20—Organic compounds not containing metal atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C7/00—Purification; Separation; Use of additives
    • C07C7/148—Purification; Separation; Use of additives by treatment giving rise to a chemical modification of at least one compound
    • C07C7/152—Purification; Separation; Use of additives by treatment giving rise to a chemical modification of at least one compound by forming adducts or complexes
    • 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
    • C10G29/00—Refining of hydrocarbon oils, in the absence of hydrogen, with other chemicals
    • 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
    • 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
    • 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
    • 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
    • C10G2300/207—Acid gases, e.g. H2S, COS, SO2, HCN

Definitions

  • This invention relates generally to the treatment of sour gas and liquid hydrocarbon to remove or reduce the levels of hydrogen sulfide therein.
  • the toxicity of hydrogen sulfide in hydrocarbon streams is well known in the industry and considerable expense and efforts are expended annually to reduce its content to a safe level.
  • a regenerative system for treating sour gas streams.
  • These systems typically employ a compound used in an absorption tower to contact the produced fluids and selectively absorb the hydrogen sulfide and possibly other toxic materials such as carbon dioxide and mercaptans. The absorption compound is then regenerated and reused in the system.
  • Typical hydrogen sulfide absorption materials include alkanolamines, PEG, hindered amines, and other species that can be regenerated.
  • Nonregenerative scavengers for small plant hydrogen sulfide removal fall into four general categories: 1) aldehyde based, 2) metallic oxide based, 3) caustic based, and 4) other processes.
  • the scavenger reacts with the hydrogen sulfide to form a nontoxic compound or a compound, which can be removed from the hydrocarbon.
  • a chemical compound known as formthionals e.g., trithiane
  • Prior Art aldehyde scavengers typically include low molecular weight aldehydes and ketones and adducts thereof.
  • the low molecular weight aldehydes may also be combined with an alkyl or alkanolamine as disclosed in US Patent 4,748,011.
  • Other aldehyde derived scavengers include the reaction product of low molecular weight alkanolamines and aldehydes as disclosed in US Patent 4,978, 12.
  • PCT Application WO 92/01481 discloses a method of reducing sulfides in a sewage gas using certain tri-substituted-hexahydro-s-triazines.
  • German reference DE4027300 discloses a regenerative solvent for removing 3 ⁇ 4S and mercaptans.
  • US Patent 5,347,004 discloses the use of 1 ,3,5 alkoxyalkylene hexahydro triazines.
  • PCT Application WO 91 US 5232 discloses hydroxyalkyl triazine scavengers, specifically an N,N',N"-tris(2- hydroxyethyl)hexahydro-s-triazine.
  • US Patent 5,774,024 discloses the combination of an alkyl triazine scavenger and quaternary ammonium salt, where the quaternary ammonium salt enhances the effectiveness of the alkyl-triazine..
  • At least one embodiment of the invention is directed towards a method for removing hydrogen sulfide from a hydrocarbon fluid.
  • the method comprises contacting the fluid with an effective amount of sulfide scavenger formulated with a nitroxide promoter.
  • the amount of nitroxide promoter is sufficient to accelerate the scavenging action of the scavenger in comparison to the scavenging action of the scavenger in the absence of the nitroxide promoter.
  • Alkyl-triazine means a molecule according to the formula:
  • R ls R 2 , R 3 are Alkyl groups such as methyl, ethyl, propyl, isopropyl, t-butyl, etc. or are substituted alkyl groups such as CH 2 CH 2 OH, and R l5 R 2 , R3 can all be the same group or one or more different groups.
  • Alkyl-triazines include but are not limited to the triazines disclosed in US Patent 5,744,024.
  • Hydrocarbon fluid means a liquid or gas predominantly comprising organic material including but not limited to kerosene, crude oil, distillate fuels, fuel oil, heating oils, diesel fuel, gasoline, jet fuel, bunker fuel oils, and any combination thereof.
  • Methods means an alkyl-triazine in which R ls R 2 , and R 3 are all methyl groups.
  • R 2 where Ri R 2 and R 3 are any alkyl group containg 1 - 30 carbon atoms and includes cyclic compounds.
  • Non-Regenerative Scavenger means a scavenger, which is consumed by the process of scavenging.
  • Regenerative Scavenger means a scavenger, which is not consumed by the process of scavenging.
  • Promoter means a composition of matter that in and of itself does not scavenge, but when combined with a known scavenger, significantly increases the effectiveness of the scavenger.
  • Salt means a compound comprising an anion and a cation which usually ionizes in solution.
  • “Scavenger” means a composition of matter, such as but not limited to alkyl triazines, useful in reducing the amount of some other composition of matter, such as but not limited to hydrogen sulfide, in a fluid medium.
  • the amount of hydrogen sulfide in a hydrocarbon fluid is reduced by the introduction of an alkyl-triazine scavenger with a nitroxide promoter.
  • the promoter increases the effectiveness of the alkyl-triazine scavenger.
  • Nitroxide is superior to the prior art quarternay ammonium salt promoters because nitroxide is a single component and does not contain halides such as chloride.
  • the effectiveness of a nitroxide as a promoter is unexpected because it is a single neutral compound.
  • the promoter is from 1-25% of the scavenger-promoter containing composition.
  • At least a portion of the triazines are synthesized according to the process described in US Patent 5,744,024.
  • the ntiroxide is mixed with a solution of alkyl triazine where the solvent can be water and the nitroxide bearing solution is introduced into the hydrocarbon fluid.
  • the nitroxide introduction is simultaneous to the alkyl-triazine introduction.
  • nitroxide promoter with a scavenger over the prior art scavengers is that the nitroxide promoter is not a salt (it is not a combination of an anion and a cation) and therefore lacks halides and in particular lacks chloride.
  • a scavenging formulation is used in a hydrocarbon stream.
  • the formulation comprises a solvent, alkyl-triazine, and nitroxide.
  • the solvent is selected from the list consisting of water, alcohol, aromatic solvent, a solvent that mutually solvates alkyl-triazine, and nitroxide and any combination thereof.
  • the formulation can be introduced into the hydrocarbon stream by mechanical means including but not limited to injection pumps or any mechanism disclosed in US Patents 5,744,024 and 5,840,177.
  • the gas may be passed through an absorption tower containing a scavenging formulation.
  • the hydrocarbon fluid is in a liquid state. In at least one embodiment the hydrocarbon fluid is in a gaseous state.
  • the vapor space hydrogen sulfide levels were measured according to the procedure described by AST D5705-03.
  • the test procedure was modified for tables 2 and 3 by performing the test in kerosene at room temperature, which was approximately 22 °C instead of 60 °C.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Water Supply & Treatment (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)

Abstract

The invention provides a method of removing hydrogen sulfide from hydrocarbon fluids. The method involves using a nitroxide molecule to promote a sulfide scavenger such as alkyl-triazine. The nitroxide effectively accelerates the scavengers activity. This allows for the avoidance of the introduction of halides into the hydrocarbon stream.

Description

IMPROVED METHOD OF REMOVING HYDROGEN SULFIDE
Cross-Reference to Related Applications
None.
Statement Regarding Federally Sponsored Research or Development
Not Applicable,
Background of the Invention
This invention relates generally to the treatment of sour gas and liquid hydrocarbon to remove or reduce the levels of hydrogen sulfide therein. The toxicity of hydrogen sulfide in hydrocarbon streams is well known in the industry and considerable expense and efforts are expended annually to reduce its content to a safe level.
In large production facilities, it is generally more economical to install a regenerative system for treating sour gas streams. These systems typically employ a compound used in an absorption tower to contact the produced fluids and selectively absorb the hydrogen sulfide and possibly other toxic materials such as carbon dioxide and mercaptans. The absorption compound is then regenerated and reused in the system. Typical hydrogen sulfide absorption materials include alkanolamines, PEG, hindered amines, and other species that can be regenerated.
Nonregenerative scavengers for small plant hydrogen sulfide removal fall into four general categories: 1) aldehyde based, 2) metallic oxide based, 3) caustic based, and 4) other processes. In the removal of hydrogen sulfide by nonregenerative compounds, the scavenger reacts with the hydrogen sulfide to form a nontoxic compound or a compound, which can be removed from the hydrocarbon. For example, when formaldehyde reacts with hydrogen sulfide, a chemical compound known as formthionals (e.g., trithiane) is formed.
Prior Art aldehyde scavengers typically include low molecular weight aldehydes and ketones and adducts thereof. The low molecular weight aldehydes may also be combined with an alkyl or alkanolamine as disclosed in US Patent 4,748,011. Other aldehyde derived scavengers include the reaction product of low molecular weight alkanolamines and aldehydes as disclosed in US Patent 4,978, 12. PCT Application WO 92/01481 discloses a method of reducing sulfides in a sewage gas using certain tri-substituted-hexahydro-s-triazines. German reference DE4027300 discloses a regenerative solvent for removing ¾S and mercaptans. US Patent 5,347,004 discloses the use of 1 ,3,5 alkoxyalkylene hexahydro triazines. PCT Application WO 91 US 5232 discloses hydroxyalkyl triazine scavengers, specifically an N,N',N"-tris(2- hydroxyethyl)hexahydro-s-triazine. US Patent 5,774,024 discloses the combination of an alkyl triazine scavenger and quaternary ammonium salt, where the quaternary ammonium salt enhances the effectiveness of the alkyl-triazine..
Thus there is clear need and utility for an improved method of scavenging hydrogen sulfide from hydrocarbon fluids. The art described in this section is not intended to constitute an admission that any patent, publication or other information referred to herein is "prior art" with respect to this invention, unless specifically designated as such. I addition, this section should not be construed to mean that a search has been made or that no other pertinent information as defined in 37 CF § 1.56(a) exists.
Brief Summary of the Invention
At least one embodiment of the invention is directed towards a method for removing hydrogen sulfide from a hydrocarbon fluid. The method comprises contacting the fluid with an effective amount of sulfide scavenger formulated with a nitroxide promoter. The amount of nitroxide promoter is sufficient to accelerate the scavenging action of the scavenger in comparison to the scavenging action of the scavenger in the absence of the nitroxide promoter. Detailed Description of the Invention
For purposes of this application the definition of these terms is as follows:
"Alkyl-triazine" means a molecule according to the formula:
Where Rls R2, R3 are Alkyl groups such as methyl, ethyl, propyl, isopropyl, t-butyl, etc. or are substituted alkyl groups such as CH2CH2OH, and Rl5 R2, R3 can all be the same group or one or more different groups. Alkyl-triazines include but are not limited to the triazines disclosed in US Patent 5,744,024.
"Hydrocarbon fluid" means a liquid or gas predominantly comprising organic material including but not limited to kerosene, crude oil, distillate fuels, fuel oil, heating oils, diesel fuel, gasoline, jet fuel, bunker fuel oils, and any combination thereof.
"Methyltriazine" means an alkyl-triazine in which Rls R2, and R3 are all methyl groups.
"Nitroxide" means a composition of matter according to the formula:
R2 where Ri R2 and R3 are any alkyl group containg 1 - 30 carbon atoms and includes cyclic compounds.
"Non-Regenerative Scavenger" means a scavenger, which is consumed by the process of scavenging.
"Regenerative Scavenger" means a scavenger, which is not consumed by the process of scavenging.
"Promoter" means a composition of matter that in and of itself does not scavenge, but when combined with a known scavenger, significantly increases the effectiveness of the scavenger.
"Salt" means a compound comprising an anion and a cation which usually ionizes in solution.
"Scavenger" means a composition of matter, such as but not limited to alkyl triazines, useful in reducing the amount of some other composition of matter, such as but not limited to hydrogen sulfide, in a fluid medium.
In the event that the above definitions or a description stated elsewhere in this application is inconsistent with a meaning (explicit or implicit) which is commonly used, in a dictionary, or stated in a source incorporated by reference into this application, the application and the claim terms in particular are understood to be construed according to the definition or description in this application, and not according to the common definition, dictionary definition, or the definition that was incorporated by reference. In light of the above, in the event that a term can only be understood if it is construed by a dictionary, if the term is defined by the Kirk-Othmer Encyclopedia of Chemical Technology, 5th Edition, (2005), (Published by Wiley, John & Sons, Inc.) this definition shall control how the term is to be defined in the claims.
In at least one embodiment, the amount of hydrogen sulfide in a hydrocarbon fluid is reduced by the introduction of an alkyl-triazine scavenger with a nitroxide promoter. The promoter increases the effectiveness of the alkyl-triazine scavenger. Nitroxide is superior to the prior art quarternay ammonium salt promoters because nitroxide is a single component and does not contain halides such as chloride.
The effectiveness of a nitroxide as a promoter is unexpected because it is a single neutral compound. In at least one embodiment the promoter is from 1-25% of the scavenger-promoter containing composition.
In at least one embodiment, at least a portion of the triazines are synthesized according to the process described in US Patent 5,744,024.
In at least one embodiment the ntiroxide is mixed with a solution of alkyl triazine where the solvent can be water and the nitroxide bearing solution is introduced into the hydrocarbon fluid. In at least one embodiment the nitroxide introduction is simultaneous to the alkyl-triazine introduction. The properties of the ntiroxide promoter are such that it is highly effective in a number of different hydrocarbon fluids.
One advantage of the use of the nitroxide promoter with a scavenger over the prior art scavengers is that the nitroxide promoter is not a salt (it is not a combination of an anion and a cation) and therefore lacks halides and in particular lacks chloride.
In at least one embodiment a scavenging formulation is used in a hydrocarbon stream. The formulation comprises a solvent, alkyl-triazine, and nitroxide. The solvent is selected from the list consisting of water, alcohol, aromatic solvent, a solvent that mutually solvates alkyl-triazine, and nitroxide and any combination thereof. The formulation can be introduced into the hydrocarbon stream by mechanical means including but not limited to injection pumps or any mechanism disclosed in US Patents 5,744,024 and 5,840,177. In the context of gaseous hydrocarbon fluids, the gas may be passed through an absorption tower containing a scavenging formulation.
In at least one embodiment the hydrocarbon fluid is in a liquid state. In at least one embodiment the hydrocarbon fluid is in a gaseous state.
EXAMPLES
The foregoing may be better understood by reference to the following example, which is presented for purposes of illustration and is not intended to limit the scope of the invention.
Samples of sour hydrocarbon streams (fuel oils) were tested to determine the efficiency of the triazine formulated with promoter versus the triazine formulated without a promoter. The samples were comparatively treated with various dosages of methyltriazine scavenger, methyltriazine scavenger with a promoter, and the amounts of residual ¾S for the various samples were recorded. Table 1 compares the inventive composition at different concentrations, Table 2 compares promoted scavenger with non- promoted scavenger, and table 3 compares methyltriazine with and without promoter over time. Table 1 : Comparison of promoter at 3 different concentrations in vacuum gas oil for 2 hours at 60 °C
Dose H2S Percent Dose
Sample # Treatment (ppm) (ppm¾ Reduction Ratio
Untreated 0 200 0
Methyltriazine +
1 2.5% nitroxide 60 100 50 0.3 Methyltriazine +
2 5% nitroxide 60 120 40 0.3 Methyltriazine +
3 10% nitroxide 60 130 35 0.3
Table 2; Comparison of promoted and non-promoted triazine, in kerosene for 2 hours
Dose H2S Percent Dose Sample # Treatment (ppm) (ppm) Reduction Ratio
Untreated 1300
Methyltriazine +
5% Quaternary
ammonium 260 70 95 0.2 Methyltriazine +
5% nitroxide 260 90 93 0.2 Methyltriazine 260 120 91 0.2
Untreated 950
Methyltriazine +
5% Quaternary
ammonium 284 30 97 0.3 Methyltriazine +
5% nitroxide 284 70 93 0.3 Methyltriazine 284 80 92 0.3
Table 3: Comparison of alkyl-triazine with and without promoter over time in kerosene
Dose H2S Percent Dose Time
Sample # Treatment (ppm) (ppm) Reduction Ratio (min)
Untreated 0 1200 0 0
Methyltriazine
1 + nitroxide 400 300 75 0.3 15
Methyltriazine
2 + nitroxide 400 200 83 0.3 30
Methyltriazine
3 + nitroxide 400 85 93 0.3 60
Methyltriazine
4 + nitroxide 400 75 94 0.3 90
Methyltriazine
5 + nitroxide 400 75 94 0.3 120
Untreated 0 600 0.3 0
1 Methyltriazine 200 250 58 0.3 15
2 Methyltriazine 200 230 62 0.3 30
3 Methyltriazine 200 110 82 0.3 60
4 Methyltriazine 200 60 90 0.3 90
5 Methyltriazine 200 70 88 0.3 120
The vapor space hydrogen sulfide levels were measured according to the procedure described by AST D5705-03. The test procedure was modified for tables 2 and 3 by performing the test in kerosene at room temperature, which was approximately 22 °C instead of 60 °C.
This data demonstrates that the presence of the nitroxide enables the methyltraizine scavenger to reduce the levels of H2S faster than methyltriazine does without the promoter.
While this invention may be embodied in many different forms, there are shown in the drawings and described in detail herein specific preferred embodiments of the invention. The present disclosure is an exemplification of the principles of the invention and is not intended to limit the invention to the particular embodiments illustrated. All patents, patent applications, scientific papers, and any other referenced materials mentioned herein are incorporated by reference in their entirety. Furthermore, the invention encompasses any possible combination of some or all of the various embodiments described herein and incorporated herein.
The above disclosure is intended to be illustrative and not exhaustive. This description will suggest many variations and alternatives to one of ordinary skill in this art. All these alternatives and variations are intended to be included within the scope of the claims where the term "comprising" means "including, but not limited to". Those familiar with the art may recognize other equivalents to the specific embodiments described herein which equivalents are also intended to be encompassed by the claims.
All ranges and parameters disclosed herein are understood to encompass any and all subranges subsumed therein, and every number between the endpoints. For example, a stated range of "1 to 10" should be considered to include any and all subranges between (and inclusive of) the minimum value of 1 and the maximum value of 10; that is, all subranges beginning with a minimum value of 1 or more, (e.g. 1 to 6.1), and ending with a maximum value of 10 or less, (e.g. 2.3 to 9.4, 3 to 8, 4 to 7), and finally to each number 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 contained within the range .
This completes the description of the preferred and alternate embodiments of the invention. Those skilled in the art may recognize other equivalents to the specific embodiment described herein which equivalents are intended to be encompassed by the claims attached hereto.

Claims

Claims
1. A method of reducing the amount of hydrogen sulfide in a hydrocarbon fluid comprising contacting the fluid with an effective amount of a composition, the composition comprising a sulfide scavenger and a nitroxide promoter wherein the amount of nitroxide promoter is sufficient to accelerate the scavenging action of the scavenger in comparison to the scavenging action of the scavenger in the absence of the nitroxide promoter.
2. The method of claim 1 wherein the scavenger is an alkyl-triazine.
3. The method of claim 1 wherein the hydrocarbon fluid is liquid.
4. The method of claim 1 wherein the method results in no halides being added to the hydrocarbon fluid.
EP11807421.0A 2010-07-14 2011-07-13 Improved method of removing hydrogen sulfide Withdrawn EP2593534A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/835,805 US20120012506A1 (en) 2010-07-14 2010-07-14 Method of removing hydrogen sulfide
PCT/US2011/043780 WO2012009391A2 (en) 2010-07-14 2011-07-13 Improved method of removing hydrogen sulfide

Publications (2)

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EP2593534A2 true EP2593534A2 (en) 2013-05-22
EP2593534A4 EP2593534A4 (en) 2014-04-23

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EP (1) EP2593534A4 (en)
JP (1) JP5815699B2 (en)
KR (1) KR20130047738A (en)
CN (1) CN103003395A (en)
AR (1) AR082847A1 (en)
BR (1) BR112013000887A2 (en)
CA (1) CA2805402C (en)
MX (1) MX2013000511A (en)
RU (1) RU2562610C2 (en)
SG (1) SG187080A1 (en)
WO (1) WO2012009391A2 (en)

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CN107502329B (en) * 2016-06-14 2020-07-10 中国石油大学(华东) Eliminating agent for eliminating associated hydrogen sulfide gas in heavy oil thermal recovery
SG11201811536PA (en) * 2016-06-28 2019-01-30 Kuraray Co Composition for removing sulfur-containing compound
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US20120012506A1 (en) 2012-01-19
WO2012009391A3 (en) 2012-05-10
BR112013000887A2 (en) 2016-05-17
RU2562610C2 (en) 2015-09-10
RU2013102415A (en) 2014-08-20
CA2805402A1 (en) 2012-01-19
SG187080A1 (en) 2013-03-28
CA2805402C (en) 2018-03-13
KR20130047738A (en) 2013-05-08
MX2013000511A (en) 2013-02-27
JP2013532735A (en) 2013-08-19
EP2593534A4 (en) 2014-04-23
AR082847A1 (en) 2013-01-16
WO2012009391A2 (en) 2012-01-19
JP5815699B2 (en) 2015-11-17
CN103003395A (en) 2013-03-27

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