Patent US2091759A successfully refreshed from Google Patents.
US4795620A
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Claus residual gas cleanup using tetraethylene glycol dimethyl ethers as SO2 scrubbing agent
Assignee: Linde GmbH
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Filing: 1987-02-27
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Granted: 1989-01-03
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Expires: 2007-02-27
Abstract
Abstract A process is disclosed for the purification of a gaseous stream contaminated at least with CO 2 and H 2 S. The gaseous stream is preheated and subjected, in the presence of recycled SO 2 , to a catalytic conversion of H 2 S into elemental sulfur. The thus-obtained sulfur is separated, and the residual gas, which contains at least H 2 S, SO 2 , CO 2 , and water, is freed absorptively from SO 2 after oxidative conversion of H 2 S to SO 2 . It is proposed that the residual gas, after oxidative conversion of H 2 S to SO 2 , is cooled in heat exchangers, preferably regenerators, and is subsequently scrubbed with a solvent consisting predominantly of tetraethylene glycol dimethyl ether.
Inventors
- 👤 Michael Heisel
- 👤 Gerhard Linde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:34
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8603; B01D53/8612; B01D53/46; B01D53/48; B01D53/50; B01D53/507; C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0404; C01B17/0456; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/129
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
145 words
In a process for purifying a Claus tail gas stream discharged from a Claus plant containing H 2 S, SO 2 , CO 2 and water; said process comprising oxidizing said Claus tail gas to convert the H 2 S to SO 2 ; cooling resultant oxidized gas, and subjecting cooled oxidized gas to a scrubbing stage comprising scrubbing and regeneration steps to separate SO 2 which is later recycled to said Claus plant, the scrubbing being conducted in a scrubbing column; the improvement which comprises cooling the oxidized gas to 60°-120° C., further cooling said oxidized gas to about 15°-40° C., and employing as the scrubbing agent a physical solvent at about 0°-40° C. on a dry basis, consisting essentially of 60-80% of tetraethylene glycol dimethyl ether; 15-25% of triethylene glycol dimethyl ether; 2.5-7.5% of pentaethylene glycol dimethyl ether; and 2.5-7.5% of mono ethers.
Claim 2
Dependent Claim
145 words
In a process for purifying a Claus tail gas stream discharged from a Claus plant containing H 2 S, SO 2 , CO 2 and water; said process comprising oxidizing said Claus tail gas to convert the H 2 S to SO 2 ; cooling resultant oxidized gas, and subjecting cooled oxidized gas to a scrubbing stage comprising scrubbing and regeneration steps to separate SO 2 which is later recycled to said Claus plant, the scrubbing being conducted in a scrubbing column; the improvement which comprises cooling the oxidized gas to 60°-120° C., further cooling said oxidized gas to about 15°-40° C., and employing as the scrubbing agent a physical solvent at about 0°-40° C. on a dry basis, consisting essentially of 60-80% of tetraethylene glycol dimethyl ether; 15-25% of triethylene glycol dimethyl ether; 2.5-7.5% of pentaethylene glycol dimethyl ether; and 2.5-7.5% of mono ethers.
Claim 3
Dependent Claim
26 words
A process according to claim 1, wherein the oxidized gas, before being cooled to 60°-120° C., is cooled in heat exchange with Claus plant feed gas.
Claim 4
Dependent Claim
18 words
A process according to claim 2, wherein regenerators are utilized to cool said oxidized gas to 60°-120° C.
Claim 5
Dependent Claim
27 words
A process according to claim 3, further comprising passing said Claus tail gas, prior to the oxidation step, through the regenerators in order to cool the regenerators.
Claim 6
Dependent Claim
39 words
A process according to claim 1, wherein the solvent, on a dry basis, consists essentially of 70% of tetraethylene glycol dimethyl ether; 20% of triethylene glycol dimethyl ether; 5% of pentaethylene glycol dimethyl ether; and 5% of mono ethers.
Claim 7
Dependent Claim
18 words
A process according to claim 1, wherein regenerators are utilized to cool said oxidized gas to 60°-120° C.
Claim 8
Dependent Claim
21 words
A process according to claim 6, further comprising passing air or oxygen through the regenerators in order to cool the regenerators.
Claim 9
Dependent Claim
21 words
A process according to claim 6, further comprising passing a sulfur-free gas through the regenerators in order to cool the regenerators.
Claim 10
Dependent Claim
27 words
A process according to claim 6, further comprising passing said Claus tail gas, prior to the oxidation step, through the regenerators in order to cool the regenerators.
Claim 11
Dependent Claim
39 words
A process according to claim 4, wherein the solvent, on a dry basis, consists essentially of 70% of tetraethylene glycol dimethyl ether; 20% of triethylene glycol dimethyl ether; 5% of pentaethylene glycol dimethyl ether; and 5% of mono ethers.
Claim 12
Dependent Claim
37 words
A process according to claim 1, wherein said regeneration step is conducted in a regeneration column and said oxidized gas is further cooled to about 15°-40° C. in heat exchange with bottom liquid from said regeneration column.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-03 | 1992-07-04 | 1993-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-03 | 1996-07-04 | 1997-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-03 | 2000-07-04 | 2001-01-03 | $7700.00 | Window Closed / Lapsed |