Patent US4664903A successfully refreshed from Google Patents.
US4664903A
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US
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Removal of sulfur compounds from gases
Assignee: Linde GmbH
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Filing: 1985-06-07
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Granted: 1987-05-12
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Expires: 2005-06-07
Abstract
Abstract For the removal of sulfur compounds, especially H2S, from gases that contain hydrocarbons, and/or CO2, the gases are scrubbed with a physical solvent, which is to be regenerated and reused. To obtain sulfur free of hydrocarbons, as well as a practically sulfur-free LPG fraction and optionally a C5+ fraction, an oxidizing agent is added to the solvent for reacting the sulfur compounds to elemental sulfur, and the sulfur is separated. The concomitantly absorbed hydrocarbons and/or CO2 can then be desorbed from the separated solvent by physical regeneration and can be recovered.
Inventors
- 👤 Hans Becker
- 👤 Michael Heisel
- 👤 Karl Baur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:04
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/05; B; B01; B01D; B01D53/00; B01D53/14; B01D53/1418; B01D53/1456; B01D53/1468; C07; C07C; C07C7/00; C07C7/11; C10; C10K; C10K1/00; C10K1/08; C10K1/16
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
104 words
In a process for the removal of sulfur compounds from gases that include a C 3+ hydrocarbon fraction, comprising scrubbing the gas with a physical solvent which absorbs the sulfur compounds and gases that include a C 3+ fraction in the scrubbing stage and regenerating and reusing the physical solvent, the improvement comprising withdrawing the loaded solvent from the scrubbing stage; adding an oxidizing agent to the physical solvent to react the sulfur compounds to elemental sulfur; separating the resultant sulfur from the solvent; and further separating and recovering the co-absorbed gases that include a C 3+ fraction from the solvent by physical regeneration.
Claim 2
Dependent Claim
104 words
In a process for the removal of sulfur compounds from gases that include a C 3+ hydrocarbon fraction, comprising scrubbing the gas with a physical solvent which absorbs the sulfur compounds and gases that include a C 3+ fraction in the scrubbing stage and regenerating and reusing the physical solvent, the improvement comprising withdrawing the loaded solvent from the scrubbing stage; adding an oxidizing agent to the physical solvent to react the sulfur compounds to elemental sulfur; separating the resultant sulfur from the solvent; and further separating and recovering the co-absorbed gases that include a C 3+ fraction from the solvent by physical regeneration.
Claim 3
Dependent Claim
22 words
A process according to claim 1, wherein the oxidizing agent is added to the solvent after the sulfur compounds are absorbed therein.
Claim 4
Dependent Claim
42 words
A process according to claim 1, comprising conducting, in a first process step, the separation of the sulfur compounds from the solvent and, in a subsequent, second process step, conducting the separating and recovery of the gases including a C 3+ fraction.
Claim 5
Dependent Claim
17 words
A process according to claim 1, wherein several different oxidizing agents are added in separate oxidizing stages.
Claim 6
Dependent Claim
25 words
A process according to claim 1, said oxidizing agent being added in an approximately stoichiometric proportion with respect to the reaction of the sulfur compounds.
Claim 7
Dependent Claim
12 words
A process according to claim 1, wherein the oxidizing agent is oxygen.
Claim 8
Dependent Claim
17 words
A process according to claim 1, wherein the oxidizing agent is SO 2 and/or SO 3 .
Claim 9
Dependent Claim
42 words
A process according to claim 1, wherein the addition of the oxidizing agent and/or the separation of sulfur from the solvent is performed in several series-arranged stages; and that, between individual stages, the temperature and/or the pressure of the solvent is lowered.
Claim 10
Dependent Claim
22 words
A process according to claim 1, wherein the solvent loaded with sulfur compounds is brought to a higher pressure and/or is heated.
Claim 11
Dependent Claim
29 words
A process according to claim 9, wherein gaseous phases forming during raising of the temperature and/or lowering of the pressure of the solvent are recycled into the scrubbing step.
Claim 12
Dependent Claim
23 words
A process according to claim 1, wherein the solvent, to separate the sulfur, is brought to temperatures of between -50° and +75° C.
Claim 13
Dependent Claim
23 words
A process according to claim 1, wherein the solvent, to separate the sulfur, is brought to temperatures of between 0° and +40° C.
Claim 14
Dependent Claim
30 words
A process according to claim 1, further comprising adding to the solvent an additive that accelerates the reaction rate of the reaction and/or enhances the sedimentation of the thus-formed sulfur.
Claim 15
Dependent Claim
39 words
A process according to claim 1, wherein the separated sulfur has solvent in admixture therewith, and the solvent withdrawn together with the sulfur is separated by heating the sulfur-solvent mixture, the resultant solvent being returned into the solvent cycle.
Claim 16
Dependent Claim
30 words
A process according to claim 14, wherein the sulfur-solvent mixture is heated to between 120° and 140° C., and the sulfur is separated in the liquid form from the solvent.
Claim 17
Dependent Claim
34 words
A process according to claim 1, wherein the solvent is separated, by heating and/or stripping, from lighter hydrocarbons and/or the CO 2 and from any water produced during the reaction of the sulfur compounds.
Claim 18
Dependent Claim
24 words
A process according to claim 1, wherein C 5+ hydrocarbons are separated from the solvent by decanting after addition of water and/or by extraction.
Claim 19
Dependent Claim
26 words
A process according to claim 16, wherein heavy hydrocarbons are removed from the raw gas in a process step preceding the reaction of the sulfur compounds.
Claim 20
Dependent Claim
59 words
A process according to claim 18, said heavy hydrocarbons being separated from the raw gas by means of a scrubbing step wherein the scrubbing step is performed with a partial stream of the loaded solvent from the sulfur scrubbing stage; and the heavy hydrocarbons are separated from said partial stream by decanting after addition of water and/or by extraction.
Claim 21
Dependent Claim
22 words
A process according to claim 1, further fractionating the gases including a C 3+ fraction to form an essentially sulfur-free LPG fraction.
Claim 22
Dependent Claim
21 words
A process according to claim 1, further fractionating the gases including a C 3+ fraction to form a C 5+ fraction.
Claim 23
Dependent Claim
20 words
A process according to claim 20, wherein the sulfur-free LPG fraction has less than about 5-500 molar ppm of sulfide.
Claim 24
Dependent Claim
22 words
A process according to claim 1, wherein the solvent is an alcohol, a ketone, a polyethylene glycol ethers or an aromatic hydrocarbon.
Claim 25
Dependent Claim
20 words
A process according to claim 1, wherein the solvent is methanol, N-methylpyrrolidone, dimethylformamide, polyethylene glycol ether, butyrolactone, toluene or xylene.
Claim 26
Dependent Claim
12 words
A process according to claim 13, wherein the additive is ammonium rhodanide.
References Cited (Backward Citations)
US2664345A
Cited
US2881047A
Cited
US2987379A
Cited
US3103411A
Cited
US3236905A
Cited
US3676519A
Cited
US4088735A
Cited
US4155968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |