US4197277A
Expired / Lapsed
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Process for oxidizing sulfur and sulfur compounds
Assignee: IFP Energies nouvelles
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Filing: 1977-11-02
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Granted: 1980-04-08
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Expires: 1997-11-02
Abstract
Abstract Sulfur and sulfur compounds contained in a gas are oxidized in contact with a catalyst comprising vanadium oxide, iron oxide and alumina, said catalyst having a surface higher than 30 m2/g and being obtained by impregnation of aluminum with soluble vanadium and iron compounds.
Inventors
- 👤 Andre Sugier
- 👤 Philippe Courty
- 👤 Andre Deschamps
- 👤 Henri Gruhier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:20
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0404; C01B17/046; C01B17/0465
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
143 words
In a process for oxidizing an oxidizable sulfur compound being at least one of sulfur, H 2 S, COS or CS 2 in the gas phase, wherein said sulfur compound in mixture with a gas containing molecular oxygen, is contacted with a catalyst of specific surface higher than 30 m 2 /g, which contains vanadium oxide, iron oxide and alumina, the improvement wherein the catalyst results from a process comprising impregnating alumina agglomerates with at least one dissolved vanadium compound and at least one dissolved iron compound, said agglomerates having a pore volume of 0.4 to 0.8 cm 3 /g with at least 0.1 cc/g of pores of diameter higher than 300 A and at least 0.05 cc/g of pores of diameter higher than 1,000 A, the resultant catalyst containing 1-10% by weight of vanadium oxide and 1-40% by weight of iron oxide.
Claim 2
Dependent Claim
143 words
In a process for oxidizing an oxidizable sulfur compound being at least one of sulfur, H 2 S, COS or CS 2 in the gas phase, wherein said sulfur compound in mixture with a gas containing molecular oxygen, is contacted with a catalyst of specific surface higher than 30 m 2 /g, which contains vanadium oxide, iron oxide and alumina, the improvement wherein the catalyst results from a process comprising impregnating alumina agglomerates with at least one dissolved vanadium compound and at least one dissolved iron compound, said agglomerates having a pore volume of 0.4 to 0.8 cm 3 /g with at least 0.1 cc/g of pores of diameter higher than 300 A and at least 0.05 cc/g of pores of diameter higher than 1,000 A, the resultant catalyst containing 1-10% by weight of vanadium oxide and 1-40% by weight of iron oxide.
Claim 3
Dependent Claim
18 words
A process according to claim 1, wherein the oxidizable compound is hydrogen sulfide and sulfur is the product.
Claim 4
Dependent Claim
25 words
A process according to claim 1, wherein the oxidizable compound is hydrogen sulfide in admixture with at least one of carbon oxysulfide and carbon disulfide.
Claim 5
Dependent Claim
22 words
A process according to claim 1, wherein the resultant catalyst also contains 500 to 30,000 parts by weight of silver per million.
Claim 6
Dependent Claim
19 words
A process according to claim 1, wherein the resultant catalyst also contains 1 to 20% b.w. of titanium oxide.
Claim 7
Dependent Claim
31 words
A process according to claim 1, wherein the sulfur compound comprises at least one of carbon oxysulfide and carbon disulfide and the gas is previously passed through a steam hydrolysis unit.
Claim 8
Dependent Claim
22 words
A process according to claim 1, wherein the impregnation of alumina is effected with an aqueous solution of vanadium and iron compounds.
Claim 9
Dependent Claim
31 words
A process according to claim 1, wherein the alumina agglomerates result from the treatment of fresh alumina agglomerates with steam under pressure at 110°-300° C., followed with heating at 500°-1000° C.
Claim 10
Dependent Claim
38 words
A process according to claim 1, wherein the sulfur compound comprises at least one of carbon oxysulfide and carbon disulfide and is previously passed through a steam hydrolysis unit containing a catalyst such as defined in claim 1.
Claim 11
Dependent Claim
33 words
A process according to claim 1, wherein said dissolved iron compound is iron nitrate, chloride, sulfate, or carboxylate, and said vanadium compound is vanadium ammonium sulfate, vanadium oxalate, ammonium metavanadate, or vanadic acid.
Claim 12
Dependent Claim
33 words
A process according to claim 1, wherein the process of producing the catalyst comprises the further steps of drying and thermally activating the resultant dried catalyst at a temperature of about 350°-600° C.
Claim 13
Dependent Claim
15 words
A process according to claim 11, wherein the thermal activation temperature is about 400°-550° C.
Claim 14
Dependent Claim
19 words
A process according to claim 1 wherein the oxidizing process is conducted at a temperature higher than 150° C.
Claim 15
Dependent Claim
43 words
A process according to claim 1 wherein the oxidizing process is conducted at 200°-700° C., the oxidizing process being used to treat the waste-gas from a Claus unit, and wherein the sulfur compounds in said waste gas are oxidized to SO 2 .
Claim 16
Dependent Claim
14 words
A process according to claim 14 wherein the process is conducted at 300°-600° C.
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) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |