US4277458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for oxidizing sulfur and sulfur compounds
Assignee: IFP Energies nouvelles
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Filing: 1979-07-13
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Granted: 1981-07-07
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Expires: 1999-07-13
Abstract
Abstract A gas containing carbon oxysulfide or carbon disulfide is passed in admixture with oxygen through a catalyst formed of a carrier, vanadium oxide and silver, the proportion of iron oxide, if any, being lower than 1% by weight. The amount of vanadium oxide may be 0.5 to 10% by weight and that of silver 0.05 to 4% by weight.
Inventors
- 👤 Andre Sugier
- 👤 Philippe Courty
- 👤 Andre Deschamps
- 👤 Henri Gruhier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:01
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/508; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/66; B01J23/68; B01J23/682
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
62 words
A catalytic process for directly converting any carbon oxysulfide and carbon disulfide in a gas containing at least one of the same to carbon dioxide and sulfur dioxide in a single step, which process comprises contacting a gas containing oxygen and at least one of carbon oxysulfide and carbon disulfide with a substantially iron-free catalyst comprising a carrier, vanadium oxide and silver.
Claim 2
Dependent Claim
62 words
A catalytic process for directly converting any carbon oxysulfide and carbon disulfide in a gas containing at least one of the same to carbon dioxide and sulfur dioxide in a single step, which process comprises contacting a gas containing oxygen and at least one of carbon oxysulfide and carbon disulfide with a substantially iron-free catalyst comprising a carrier, vanadium oxide and silver.
Claim 3
Dependent Claim
44 words
A process according to claim 1, wherein the carrier is alumina and the respective contents of vanadium oxide and silver are from 0.5 to 10% by weight of vanadium oxide as V 2 O 5 and from 0.05 to 4% by weight of silver.
Claim 4
Dependent Claim
22 words
A process according to claim 1, wherein the specific surface area of the catalyst is from 50 to 350 m 2 /g.
Claim 5
Dependent Claim
36 words
A process according to claim 1, wherein the catalyst is obtained by impregnating alumina with an aqueous solution of a vanadium compound and a silver compound, drying the impregnated alumina, and thermally activating the dried catalyst.
Claim 6
Dependent Claim
17 words
A process according to claim 1 which is effected at a temperature from 250° to 400° C.
Claim 7
Dependent Claim
13 words
A process according to claim 1, wherein the gas also contains hydrogen sulfide.
Claim 8
Dependent Claim
18 words
A process according to claim 1, wherein the catalyst consists essentially of a carrier, vanadium oxide and silver.
Claim 9
Dependent Claim
16 words
A process according to claim 1, wherein the vanadium oxide is V 2 O 5 .
Claim 10
Dependent Claim
34 words
A process according to claim 2, wherein the alumina carrier has a specific surface area of from 50 to 300 m 2 /g and a porosity of from 0.2 to 1 cm 3 /g.
Claim 11
Dependent Claim
67 words
A process according to claim 9, wherein the alumina carrier is in the form of balls of from 3 to 6 mm in size, having a pore volume of from 0.4 to 0.8 cm 3 /g and a pore distribution corresponding to at least 0.1 ml/g of pores of diameter higher than 300 angstroms and at least 0.05 ml/g of pores of diameter higher than 1,000 angstroms.
Claim 12
Dependent Claim
31 words
A process according to claim 4, wherein the impregnated alumina is dried at from 100° to 300° C., and the dried catalyst is thermally activated at from 350° to 600° C.
Claim 13
Dependent Claim
23 words
A process according to claim 1, wherein the volume of gas treated per volume of catalyst per hour is from 2,000 to 10,000.
Claim 14
Dependent Claim
39 words
A process according to claim 10, wherein the vanadium oxide and the silver are present on the alumina as an intimate mixture, the resultant catalyst containing, by weight, 95.8% alumina carrier, 3.8% V 2 O 5 and 0.4% Ag.
Claim 15
Dependent Claim
42 words
A process according to claim 10, wherein the vanadium oxide and the silver are present on the alumina as an intimate mixture, the resultant catalyst containing, by weight, 95.3% Al 2 O 3 , 3.7% V 2 O 5 and 1% Ag.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-06 | 1985-01-05 | 1985-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-06 | 1989-01-05 | 1989-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-06 | 1993-01-05 | 1993-07-07 | $7700.00 | Window Closed / Lapsed |