US3758676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for recovery of elemental sulfur from sour gas
Assignee: BP America Production Co
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Filing: 1971-06-21
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Granted: 1973-09-11
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Expires: 1991-06-21
Abstract
Abstract This process takes advantage of the favorable equilibrium that exists for the catalytic reaction of H2S with SO2 at temperatures of the order of 270* to about 300*F while at the same time offering considerable flexibility in the manner in which the various streams can be handled. Because of the fact that one of the reactors in a multi-reactor plant can always be operated at an effluent temperature of at least 600*F, the process assures good clean up of feed streams containing CS2 and COS. Also, valving and piping are simplified by allowing one reactor to operate as a conventional Claus reactor while the other two reactors operate alternately at temperatures above and below the sulfur dew point.
Inventors
- 👤 C Goddin
- 👤 N Montgomery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:22
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0404; C01B17/0426; C01B17/0439
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
27 words
The method of claim 1 in which the inlet temperature of said vaporous mixture introduced into said second bed is in the range of from about 450*-550*F.
Claim 2
Dependent Claim
33 words
simultaneously with removal of said sulfur, reacting the H2S and SO2 in said reaction mixture in said first zone with the generation of additional heat used to aid in vaporizing said deposited sulfur;
Claim 3
Dependent Claim
45 words
withdrawing a mixture of sulfur and unreacted H2S and SO2 from said first zone, separating the produced sulfur therefrom and introducing the resulting sulfur-denuded mixture into a second catalytic reaction zone at an inlet temperature of about 300* to about 550*F to form additional sulfur;
Claim 4
Dependent Claim
18 words
The method of claim 1 in which said reaction mixture contains an objectionable amount of CS2 and COS.
Claim 5
Dependent Claim
38 words
The method of claim 3 wherein the conditions maintained in said second bed are such that the effluent therefrom contains not more than about 0.1 percent CS2 and COS, based on the sulfur content of said gaseous stream.
Claim 6
Dependent Claim
42 words
withdrawing product sulfur and a mixture of unreacted H2S and SO2 from said second zone, separating sulfur therefrom and introducing said mixture of unreacted H2S and SO2 at a temperature of from about 270* to about 300*F into a third catalyst bed;
Claim 7
Dependent Claim
48 words
The process of claim 1 modified to the extent that when the effluent from said first catalyst bed reaches a temperature of about 600*F the feed to said second catalyst bed is reduced in temperature to a level below the dew point of the sulfur vapor produced therein.
Claim 8
Dependent Claim
21 words
continuing step 1 until the temperature of the effluent from said first zone increases to from about 600* to about 700*F;
Claim 9
Dependent Claim
27 words
thereafter lowering the inlet temperature of the feed to said first zone until the temperature of the effluent therefrom decreases to from about 500* to about 550*F;
Claim 10
Dependent Claim
40 words
diverting the flow of the reaction mixture in step 1 to said second zone, taking the sulfur-denuded effluent from the latter and introducing it at a temperature of from about 250* to about 270*F into the freshly regenerated first zone;
Claim 11
Dependent Claim
38 words
continuing step 7 until the effluent from said first zone approaches a temperature of from about 350* to about 400*F; and thereafter repeating the above cycle with the positions of the first and third catalyst zones being reversed.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |