US4059418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flue gas desulfurization sorbent and process
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1975-03-17
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Granted: 1977-11-22
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Expires: 1995-03-17
Abstract
Abstract Sulfur dioxide is removed from flue gases by contacting the flue gas at elevated temperature with a sorbent comprising a shaped refractory substrate of low surface area and an adherent oxide film impregnated with a transition metal or metal oxide which is selective for the removal of sulfur oxide from gas mixtures on the external surface of the substrate. A technique for laying down the adherent oxide film on the refractory substrate is also disclosed.
Inventors
- 👤 Neville L. Cull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:05
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/508
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
68 words
In a process wherein sulfur dioxide is separated from a gaseous mixture containing the same by contacting said gaseous mixture, under desulfurization conditions, with a solid sorbent comprising a carrier and an active material supported thereon, which active material will selectively react with sulfur dioxide at the desulfurization conditions employed, the improvement wherein said carrier comprises a low surface area substrate coated with an adherent refractory oxide film.
Claim 2
Dependent Claim
68 words
In a process wherein sulfur dioxide is separated from a gaseous mixture containing the same by contacting said gaseous mixture, under desulfurization conditions, with a solid sorbent comprising a carrier and an active material supported thereon, which active material will selectively react with sulfur dioxide at the desulfurization conditions employed, the improvement wherein said carrier comprises a low surface area substrate coated with an adherent refractory oxide film.
Claim 3
Dependent Claim
12 words
The improvement of claim 1 wherein said substrate is a ceramic material.
Claim 4
Dependent Claim
20 words
The improvement of claim 2 wherein said substrate has a surface area not over about 10 square meters per gram.
Claim 5
Dependent Claim
17 words
The improvement of claim 2 wherein said substrate has a pore volume not over about 0.5 cc/g.
Claim 6
Dependent Claim
10 words
The improvement of claim 2 wherein said substrate comprises alumina.
Claim 7
Dependent Claim
10 words
The improvement of claim 1 wherein said film is alumina.
Claim 8
Dependent Claim
15 words
The improvement of claim 1 wherein said film is a mixture of alumina and titania.
Claim 9
Dependent Claim
12 words
The improvement of claim 1 wherein said active material is copper oxide.
Claim 10
Dependent Claim
14 words
The improvement of claim 1 wherein said active material is deposited on said film.
Claim 11
Dependent Claim
34 words
The improvement of claim 1 wherein said oxide film is formed by treatment of the substrate with a hydrolyzable organic metal compound corresponding to the desired oxide film material, followed by hydrolysis and calcination.
Claim 12
Dependent Claim
27 words
The improvement of claim 6 wherein the alumina film is formed by treatment of the substrate with a hydrolyzable organic aluminum compound followed by hydrolysis and calcination.
Claim 13
Dependent Claim
14 words
The improvement of claim 4 wherein the organic aluminum compound is an aluminum alkoxide.
Claim 14
Dependent Claim
14 words
The improvement of claim 11 wherein the organic aluminum compound is an aluminum alkyl.
Claim 15
Dependent Claim
35 words
The improvement of claim 1 wherein the film comprises titania and alumina and is formed by treating the substrate with a partially prepolymerized titanium alkoxide and with an aluminum alkoxide, followed by hydrolysis and calcination.
References Cited (Backward Citations)
GB667145A
Cited
US3501897A
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US3770647A
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US3776854A
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US3755535A
Cited
US3846536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |