US3832445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfur dioxide removal
Assignee: Shell USA Inc
•
Filing: 1971-05-07
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Granted: 1974-08-27
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Expires: 1991-05-07
Abstract
Abstract Removing sulfur dioxide from an SO2 and oxygen-containing gas by contacting the gas with a solid acceptor for SO2 comprising supported cupric oxide at a temperature between 300 and 500*C and regenerating the solid acceptor by use of a reducing gas at temperatures within the same range as the acceptance temperature.
Inventors
- 👤 H Kouwenhoven
- 👤 F Pijpers
- 👤 Lookeren N Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:46
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0473; B; B01; B01D; B01D53/00; B01D53/02; B01D53/06; B01D53/10; B01D53/12; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/508; C01B17/0404; C01B17/0456; C01B17/48; C01B17/50; C01B17/60
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
29 words
The process of claim 1 wherein the reducing gas comprises hydrogen, carbon monoxide, a normally gaseous hydrocarbon, or mixtures thereof, and the SO2 and oxygen-containing gas is flue gas.
Claim 2
Dependent Claim
16 words
The process of claim 1 wherein regeneration is effected at a temperature between 350* and 450*C.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein the regenerated acceptor is oxidized to contain cupric oxide before returning it into contact with the SO2 and oxygen-containing gas.
Claim 4
Dependent Claim
13 words
The process of claim 3 wherein the reducing gas comprises a methane/hydrogen mixture.
Claim 5
Dependent Claim
14 words
The process of claim 3 wherein the reducing gas comprises a carbon mOnoxide/hydrogen mixture.
Claim 6
Dependent Claim
21 words
The process of claim 3 wherein the copper content of the solid acceptor is from 5 to 15 percent by weight.
Claim 7
Dependent Claim
29 words
The process of claim 7 wherein the carrier is natural clay, bauxite, alumina, chromia, boria, silica, silica-magnesia silica-alumina or zeolite having a surface area of at least 100 m2/g.
Claim 8
Dependent Claim
16 words
The process of claim 1 wherein acceptance and regeneration are accomplished at substantially the same temperature.
Claim 9
Dependent Claim
18 words
The process of claim 1 wherein the solid acceptor contains from 0.1 to 10 percent by weight palladium.
Claim 10
Dependent Claim
17 words
The process of claim 1 wherein the acceptor contains from 0.1 to 10 percent by weight silver.
Claim 11
Dependent Claim
10 words
The process of claim 7 wherein the carrier is alumina.
References Cited (Backward Citations)
US2747968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |