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US4012486A
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Process for reducing the total sulfur content of Claus off-gases
Assignee: Shell Development Co
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Filing: 1975-07-02
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Granted: 1977-03-15
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Expires: 1995-07-02
Abstract
Abstract The sulfur content of off-gases from processes such as the Claus process is treated by catalytically oxidizing the sulfur compounds to sulfur dioxide. By use of specific catalytic materials, low temperatures of reaction and minimal SO3 formation are achieved.
Inventors
- 👤 David M. Singleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:41
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/52
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
68 words
In a process for the oxidation of H 2 S to SO 2 in a gaseous stream containing H 2 S wherein the gaseous stream is contacted with a stoichiometric excess of oxygen with respect to the H 2 S at a temperature of from 150° to 450° C in the presence of a catalyst, the improvement wherein the catalytically active component of the catalyst consists of Bi.
Claim 2
Dependent Claim
68 words
In a process for the oxidation of H 2 S to SO 2 in a gaseous stream containing H 2 S wherein the gaseous stream is contacted with a stoichiometric excess of oxygen with respect to the H 2 S at a temperature of from 150° to 450° C in the presence of a catalyst, the improvement wherein the catalytically active component of the catalyst consists of Bi.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein the oxygen is supplied as air.
Claim 4
Dependent Claim
16 words
The method of claim 2 wherein the gaseous stream is an off-gas from a Claus plant.
Claim 5
Dependent Claim
57 words
A process for the removal of minor amounts of H 2 S from a gaseous effluent comprising, contacting the gaseous effluent with a stoichiometric excess of oxygen with respect to the H 2 S at a temperature of from 150° to 450° C in the presence of a catalyst, the catalytically active component of which is Bi.
Claim 6
Dependent Claim
57 words
A process for the removal of minor amounts of H 2 S from a gaseous effluent comprising, contacting the gaseous effluent with a stoichiometric excess of oxygen with respect to the H 2 S at a temperature of from 150° to 450° C in the presence of a catalyst, the catalytically active component of which is Bi.
Claim 7
Dependent Claim
12 words
The method of claim 4 wherein the oxygen is supplied as air.
Claim 8
Dependent Claim
124 words
In a method wherein a gaseous effluent containing minor amounts of H 2 S, SO 2 , SO 3 , COS and CS 2 is contacted with a reducing gas in the presence of a catalyst under reaction conditions to convert the bulk of the SO 2 , SO 3 , COS, and CS 2 to H 2 S in the effluent is absorbed and recovered, to produce an off-gas containing a reduced concentration of H 2 S, the improvement comprising contacting the off-gas with a stoichiometric excess of oxygen with respect to the H 2 S remaining in the off-gas at a temperature of 150° C to 450° C in the presence of a catalyst, the catalytically active component of which is Bi.
Claim 9
Dependent Claim
124 words
In a method wherein a gaseous effluent containing minor amounts of H 2 S, SO 2 , SO 3 , COS and CS 2 is contacted with a reducing gas in the presence of a catalyst under reaction conditions to convert the bulk of the SO 2 , SO 3 , COS, and CS 2 to H 2 S in the effluent is absorbed and recovered, to produce an off-gas containing a reduced concentration of H 2 S, the improvement comprising contacting the off-gas with a stoichiometric excess of oxygen with respect to the H 2 S remaining in the off-gas at a temperature of 150° C to 450° C in the presence of a catalyst, the catalytically active component of which is Bi.
Claim 10
Dependent Claim
12 words
The method of claim 6 wherein the oxygen is supplied as air.
Claim 11
Dependent Claim
13 words
The method of claim 1 wherein the Bi is present as bismuth oxide.
Claim 12
Dependent Claim
13 words
The method of claim 1 wherein the Bi is present as bismuth sulfide.
Claim 13
Dependent Claim
13 words
The method of claim 6 wherein the Bi is present as bismuth oxide.
Claim 14
Dependent Claim
13 words
The method of claim 6 wherein the Bi is present as bismuth sulfide.
References Cited (Backward Citations)
US1900751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |