US4244937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfur dioxide oxidation catalyst and process
Assignee: Texaco Inc
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Filing: 1979-07-30
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Granted: 1981-01-13
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Expires: 1999-07-30
Abstract
Abstract A catalytic process for the oxidation of sulfur-containing gases, e.g., sulfur dioxide and simultaneous production of sulfuric acid wherein a sulfur-containing gas is reacted with an oxygen-containing gas in the presence of a catalyst comprising an iron group metal on a solid support comprising a zeolite in a silica-alumina matrix.
Inventors
- 👤 Joseph A. Durkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:05
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/74; C01B17/76; C01B17/78; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/076
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
146 words
A process for the conversion of gaseous sulfur compounds to sulfuric acid which comprises passing a mixture of a gaseous sulfur compound and an oxygen-containing gas into contact with a catalyst at a temperature in the range of 150° to 600° C. and a pressure in the range of 3.5 to 350 kPa in the presence of water vapor, said catalyst comprising 5 to 10 weight percent nickel and 15 to 30 weight percent tungsten based on the total weight of the catalyst composite said nickel and tungsten being added to the catalyst by impregnation of nickel and tungsten compounds onto a base comprising 40-90 weight percent amorphous oxide having active acid sites selected from the group consisting of silica, alumina, zirconia, magnesia and beryllia and mixtures and composites of said oxides with one another and 10 to 60 weight percent of a hydrogen crystalline zeolite.
Claim 2
Dependent Claim
146 words
A process for the conversion of gaseous sulfur compounds to sulfuric acid which comprises passing a mixture of a gaseous sulfur compound and an oxygen-containing gas into contact with a catalyst at a temperature in the range of 150° to 600° C. and a pressure in the range of 3.5 to 350 kPa in the presence of water vapor, said catalyst comprising 5 to 10 weight percent nickel and 15 to 30 weight percent tungsten based on the total weight of the catalyst composite said nickel and tungsten being added to the catalyst by impregnation of nickel and tungsten compounds onto a base comprising 40-90 weight percent amorphous oxide having active acid sites selected from the group consisting of silica, alumina, zirconia, magnesia and beryllia and mixtures and composites of said oxides with one another and 10 to 60 weight percent of a hydrogen crystalline zeolite.
Claim 3
Dependent Claim
64 words
The process of claim 1 in which the hydrogen zeolite is a zeolite Y prepared by subjecting zeolite Y containing alkali metal ions to ion exchange with an aqueous solution of an ammonium compound until the ion exchange appears substantially complete, washing the ion exchanged zeolite to remove soluble alkali metal compounds and then drying at a temperature sufficiently high to drive off ammonia.
Claim 4
Dependent Claim
36 words
A process according to claim 1 wherein said mixture is passed into contact with said catalyst at a rate within the range of 1 to 500 volumes of said mixture per volume of catalyst per hour.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein the mixture of sulfur dioxide, water vapor, and uncombined oxygen comprises flue gas.
Claim 6
Dependent Claim
15 words
A process as defined in claim 1 wherein said gaseous sulfur compound comprises hydrogen sulfide.
Claim 7
Dependent Claim
15 words
A process as defined in claim 1 wherein said gaseous sulfur compound comprises sulfur dioxide.
Claim 8
Dependent Claim
20 words
A process according to claim 6 wherein said mixture contains 1 to 10 moles oxygen per mole of sulfur dioxide.
Claim 9
Dependent Claim
21 words
A process according to claim 7 wherein said mixture contains 0.5 to 5 volumes water vapor per volume of sulfur dioxide.
Claim 10
Dependent Claim
57 words
A process according to either of claim 6 or 8 wherein said base comprises from about 10 to about 60 weight percent of a hydrogen zeolite Y with the balance of said base composed of a mixture of from about 60 to about 90 weight percent silica and from about 40 to about 10 weight percent alumina.
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) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |