US4258020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the simultaneous separation of sulfur and nitrogen oxides from a gaseous mixture
Assignee: Honeywell UOP LLC
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Filing: 1979-05-16
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Granted: 1981-03-24
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Expires: 1999-05-16
Abstract
Abstract An improved process for the simultaneous separation of sulfur and nitrogen oxides from a gaseous mixture containing said oxides and oxygen is disclosed. The gaseous mixture and ammonia are contacted with a solid sulfur oxides acceptor comprising copper, copper oxide, or mixture thereof dispersed on a carrier material, and wherein said solid acceptor is subjected to cyclic regeneration in contact with a reducing gas, is disclosed. The solid acceptor further contains a rare earth metal, metal oxide or mixture thereof which functions as a sulfur oxides acceptance regeneration promoter as well as a nitrogen oxides conversion catalyst.
Inventors
- 👤 Edward A. Ginger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:59
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8637
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
In a process for the simultaneous separation of oxides of sulfur and nitrogen from a gaseous mixture containing said oxides and oxygen, wherein said mixture and ammonia are contacted with a solid sulfur oxides acceptor comprising copper, copper oxide, copper sulfate, or mixtures thereof dispersed on a carrier material, and wherein said solid acceptor is subjected to cyclic regeneration at an elevated temperature in contact with a reducing gas, the improvement which comprises compositing a rare earth metal, rare earth metal oxide or a mixture thereof with said solid acceptor, said rare earth, rare earth metal oxide or a mixture thereof, comprising an acceptance-regeneration promoter as well as a nitrogen oxides conversion catalyst.
Claim 2
Dependent Claim
113 words
In a process for the simultaneous separation of oxides of sulfur and nitrogen from a gaseous mixture containing said oxides and oxygen, wherein said mixture and ammonia are contacted with a solid sulfur oxides acceptor comprising copper, copper oxide, copper sulfate, or mixtures thereof dispersed on a carrier material, and wherein said solid acceptor is subjected to cyclic regeneration at an elevated temperature in contact with a reducing gas, the improvement which comprises compositing a rare earth metal, rare earth metal oxide or a mixture thereof with said solid acceptor, said rare earth, rare earth metal oxide or a mixture thereof, comprising an acceptance-regeneration promoter as well as a nitrogen oxides conversion catalyst.
Claim 3
Dependent Claim
28 words
The process of claim 1 further characterized in that said rare earth metal, rare earth metal oxide, or mixture thereof is cerium, cerium oxide or a mixture thereof.
Claim 4
Dependent Claim
31 words
The process of claim 1 further characterized in that said rare earth metal, metal oxide, or mixture thereof comprises from about 0.01 to about 2.0 weight percent of said solid acceptor.
Claim 5
Dependent Claim
29 words
The process of claim 1 further characterized in that said copper, copper oxide, or mixture thereof comprises from about 5 to about 15 weight percent of said solid acceptor.
Claim 6
Dependent Claim
27 words
The process of claim 1 further characterized in that said carrier material is an alumina with a surface area of at least about 50 m 2 /gm.
Claim 7
Dependent Claim
14 words
The process of claim 1 further characterized in that said carrier material is gamma-alumina.
Claim 8
Dependent Claim
14 words
The process of claim 1 further characterized in that said carrier material is eta-alumina.
Claim 9
Dependent Claim
33 words
The process of claim 1 further characterized in that said ammonia is employed in from about a 0.1:1 to about a 2.5:1 mole ratio with the nitrogen oxides content of said gaseous mixture.
Claim 10
Dependent Claim
36 words
The process of claim 1 further characterized in that said solid acceptor is regenerated by heating the same in contact with a reducing gas comprising hydrogen and from about 50 to about 90 vol. % steam.
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) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |