Process for sulfur removal suitable for treating high-pressure gas streams
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C01B-017/04
C01B-017/00
C01B-017/05
출원번호
US-0961354
(2004-10-07)
등록번호
US-7381393
(2008-06-03)
발명자
/ 주소
Lynn,Scott
출원인 / 주소
The Regents of the University of California
대리인 / 주소
Townsend and Townsend and Crew LLP
인용정보
피인용 횟수 :
63인용 특허 :
5
초록▼
H2S-containing gases, particularly such gases at elevated pressure, are treated to remove H2S by reaction in a liquid medium with SO2, the SO2 being present in stoichiometric excess with respect to the H2S. The SO2 is produced by combustion of sulfur, preferably sulfur produced in the reaction betwe
H2S-containing gases, particularly such gases at elevated pressure, are treated to remove H2S by reaction in a liquid medium with SO2, the SO2 being present in stoichiometric excess with respect to the H2S. The SO2 is produced by combustion of sulfur, preferably sulfur produced in the reaction between H2S and SO2, preferably with oxygen. The process produces a treated gas that is substantially free of both H2S and SO2. An acid-gas absorber/stripper system or other system typically found in such processes to raise or concentrate the H2S level in the gas to be treated, is not needed in operations according to the invention.
대표청구항▼
What is claimed is: 1. In a process in which hydrogen sulfide in a hydrogen sulfide-containing gas is removed from said gas by reaction with sulfur dioxide to produce elemental sulfur in a liquid medium, the invention comprising conducting said reaction so as to react the hydrogen sulfide substanti
What is claimed is: 1. In a process in which hydrogen sulfide in a hydrogen sulfide-containing gas is removed from said gas by reaction with sulfur dioxide to produce elemental sulfur in a liquid medium, the invention comprising conducting said reaction so as to react the hydrogen sulfide substantially to extinction using a stoichiometric excess of sulfur dioxide and producing a gas substantially free of hydrogen sulfide and containing from 0.01 to 1 vol. % sulfur dioxide. 2. A process according to claim 1 in which the H2S-containing gas stream is at a pressure of at least about 5 bar absolute. 3. A process according to claim 1 in which the H2S-containing gas stream is at a pressure of from about 10 to about 100 bar absolute. 4. A process according to claim 1 in which the reactor is operated at a pressure of from about 10 to about 100 bar absolute. 5. A process according to claim 1 in which the reactor is operated at a temperature of from about 119 to about 155�� C. 6. A process according to claim 1 in which the reactor is operated at a temperature of from about 125 to about 145�� C. 7. A process according to claim 1 in which the reactor is operated at a temperature of from about 125 to about 140�� C. 8. A process according to claim 1 in which the SO2 is introduced into the reaction in the form of a liquid. 9. A process according to claim 1 in which part or all the SO2 is introduced into the reaction in the form of a gas. 10. A process according to claim 1 in which the reaction is conducted in the presence of a solvent selected from one or a mixture of polyglycol ethers. 11. A process according to claim 10 in which the one or more polyglycol ethers is selected from the methyl ether of triethylene glycol, the dimethyl ether of triethylene glycol, the dimethyl ether of polyethylene glycol, and the methyl ether of diethylene glycol. 12. A process according to claim 1 in which the reaction is conducted in the presence of a homogenous catalyst for the reaction. 13. A process according to claim 12 in which the catalyst is selected from aromatic amines that contain an aromatic ring nitrogen atom and in which there is no moiety attached to a carbon atom adjacent to a ring nitrogen atom. 14. A process according to claim 13 in which the catalyst is selected from pyridines, quinolines and isoquinolines, optionally substituted at one or more sites other than adjacent to a ring nitrogen atom with a polar group selected from the group consisting of hydroxyl, hydroxyalkyl, acetamido, acetyl, acetylalkyl, acetyloxy, acetyloxyalkyl, alkoxy, alkoxyalkyl, amino, alkylamino and aminoalkyl. 15. A process according to claim 13 in which the catalyst comprises 3-hydroxymethylpyridine. 16. A process for removing H2S from a gas containing it, comprising: (a) reacting an H2S-containing gas stream with a stoichiometric excess of SO2 in a reactor so as to react the hydrogen sulfide substantially to extinction and to produce an SO2-containing gas substantially free of H2S and containing from 0.01 to 1 vol. % sulfur dioxide and liquid sulfur, the reaction being conducted in an organic liquid solvent containing a homogeneous catalyst that promotes the reaction description="In-line Formulae" end="lead"2H2S+SO23S+2H2Odescription="In-line Formulae" end="tail" at a temperature in the reactor that is above the melting point of sulfur; (b) withdrawing liquid sulfur from the reactor; (c) withdrawing the SO2-containing gas of step (a) from the reactor; (d) removing SO2 from the gas of step (c) to produce a substantially H2S-and SO2-free gas, and (e) recycling the SO2 removed in step (d) to step (a). 17. A process according to claim 16 in which the H2S-containing gas stream is at a pressure of at least about 5 bar absolute. 18. A process according to claim 16 in which the H2S-containing gas stream is at a pressure of from about 10 to about 100 bar absolute. 19. A process according to claim 16 in which the reactor is operated at a pressure of from about 10 to about 100 bar absolute. 20. A process according to claim 16 in which the H2S-containing gas is introduced into the reactor without having previously been passed through a system for raising or concentrating the H2S content of the gas. 21. A process according to claim 16 in which the H2S-containing gas is synthesis gas containing one or more of H2, CO, H2O, COS and CO2. 22. A process according to claim 21 in which the H2S-containing gas is synthesis gas produced by gasifying coal or a heavy petroleum fraction. 23. A process according to claim 16 in which the H2S-containing gas comprises natural gas or an H2S-containing refinery gas. 24. A process according to claim 16 in which the H2S-containing gas additionally contains one or more substances selected from HCl, NH3, and heavy metals, and said one or more substances are substantially removed from the H2S-containing gas. 25. A process according to claim 24 in which said one or more substances are removed from the H2S-containing gas by contacting said gas with a glycol ether containing about 10-20% water. 26. A process according to claim 16 further comprising water removal from the product gas in step (d). 27. A process according to claim 16 further comprising removing sulfur-containing compounds other than SO2 from the SO2-containing gas of step (c), compressing the so treated gas and introducing it into a combustion step to produce SO2 from said sulfur-containing compounds. 28. A process according to claim 16 in which SO2 produced in step (c) is compressed and condensed to obtain liquid SO2, and the liquid SO2 is introduced into step (a) under elevated pressure. 29. A process for removing H2S from a gas containing it, comprising: (a) reacting an H2S-containing gas stream with a stoichiometric excess of SO2 in a reactor so as to react the hydrogen sulfide substantially to extinction and to produce an SO2-containing gas substantially free of H2S and liquid sulfur and containing from 0.01 to 1 vol. % sulfur dioxide, the H2S-containing gas being at a pressure of at least 5 bar absolute, the reaction being conducted in an organic liquid solvent containing a homogeneous catalyst that promotes the reaction description="In-line Formulae" end="lead"2H2S+SO23S+2H2Odescription="In-line Formulae" end="tail" at a temperature in the reactor that is above the melting point of sulfur; (b) withdrawing liquid sulfur from the reactor; (c) combusting the sulfur from step (b) to produce SO2 used in step (a); (d) withdrawing the SO2-containing gas of step (a) from the reactor; (e) removing SO2 from the gas of step (d) to produce a substantially H2S-and SO2-free gas, and (f) recycling the SO2 removed in step (e) to step (a).
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이 특허에 인용된 특허 (5)
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