Patent US3725531A successfully refreshed from Google Patents.
US3725531A
Expired / Lapsed
US
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Catalytic conversion of organic sulfur components of industrial off-gases
Assignee: CIT Group Business Credit Inc
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Filing: 1971-02-22
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Granted: 1973-04-03
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Expires: 1991-02-22
Abstract
Abstract A process wherein industrial off-gases containing organic sulfur components are contacted with an alumina base catalyst to convert these organic sulfur components to easily removable compounds such as CO2 and S. The catalysts employed comprise an alumina base support in combination with at least one metal selected from strontium, calcium, magnesium, zinc, cadmium, barium and molybdenum employed as promoters. The catalysts have significantly increased service life due to the high resistance to sulfate poisoning.
Inventors
- 👤 M Pearson
- 👤 O Olsen
- 👤 J Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:43
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/60; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/485; B01D53/50; B01D53/501
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
26 words
The process of claim 1, wherein the promoter quantity in the catalyst is from about 1 percent to about 20 percent by weight of the catalyst.
Claim 2
Dependent Claim
31 words
The process of claim 1, wherein the contacting is accomplished at a temperature between 200* and 400* C and the surface area of the support is greater than about 50 m2/g.
Claim 3
Dependent Claim
17 words
The process of claim 1, wherein the support is a spherical alumina possessing essentially a chi-rho structure.
Claim 4
Dependent Claim
12 words
The process of claim 1, wherein the support is an activated bauxite.
Claim 5
Dependent Claim
10 words
The process of claim 1, wherein the promoter is zinc.
Claim 6
Dependent Claim
10 words
The process of claim 1, wherein the promoter is cadmium.
Claim 7
Dependent Claim
10 words
The process of claim 1, wherein the promoter is calcium.
Claim 8
Dependent Claim
10 words
The process of claim 1, wherein the promoter is magnesium.
Claim 9
Dependent Claim
10 words
The process of claim 1, wherein the promoter is molybdenum.
References Cited (Backward Citations)
US1771481A
Cited
US2747968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |