Patent US4022870A successfully refreshed from Google Patents.
US4022870A
Expired / Lapsed
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Catalytic process for removing sulfur dioxide from gas streams
Assignee: Verizon Laboratories Inc
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Filing: 1975-07-16
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Granted: 1977-05-10
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Expires: 1995-07-16
Abstract
Abstract This application describes a process for the catalytic reduction of sulfur dioxide in gas streams containing sulfur dioxide to elemental sulfur using a reducing gas such as hydrogen or, preferably, carbon monoxide, in a reactor charged with a material represented by the formula Ln 2 O 3 . Co 2 O 3 , where Ln is either Y or Gd. In a further aspect of this invention, a gas stream containing hydrogen sulfide or carbonyl sulfide and sulfur dioxide is passed through a reaction chamber charged with Ln 2 O 3 . Co 2 O 3 , where Ln is either Y or Gd, to catalytically produce at a sufficiently elevated temperature elemental sulfur with concomitant reduction of the concentrations of the undesired hydrogen sulfide or carbonyl sulfide and sulfur dioxide.
Inventors
- 👤 Frank C. Palilla
- 👤 Gary G. Gaudet
- 👤 Helmut Lingertat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:10
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8603; B01D53/8609; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/83; C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0473; C01B17/0478; C01B17/0486; C01B17/0491
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
110 words
A process for removing sulfur dioxide from a gas stream containing sulfur dioxide comprising passing a gas stream containing sulfur dioxide and carbon monoxide or hydrogen through a reaction chamber containing derivatives of Ln 2 O 3 . Co 2 O 3 after prereduction by carbon monoxide or hydrogen, or derivatives of Ln 2 O 3 . Co 2 O 3 after prereduction by carbon monoxide or hydrogen and exposure to said gas stream, where Ln is either Y or Gd, to catalytically produce at a sufficiently elevated temperature a product stream containing elemental sulfur and carbon dioxide or water, and thereafter removing said elemental sulfur from said product stream.
Claim 2
Dependent Claim
110 words
A process for removing sulfur dioxide from a gas stream containing sulfur dioxide comprising passing a gas stream containing sulfur dioxide and carbon monoxide or hydrogen through a reaction chamber containing derivatives of Ln 2 O 3 . Co 2 O 3 after prereduction by carbon monoxide or hydrogen, or derivatives of Ln 2 O 3 . Co 2 O 3 after prereduction by carbon monoxide or hydrogen and exposure to said gas stream, where Ln is either Y or Gd, to catalytically produce at a sufficiently elevated temperature a product stream containing elemental sulfur and carbon dioxide or water, and thereafter removing said elemental sulfur from said product stream.
Claim 3
Dependent Claim
9 words
The process of claim 1 wherein Ln is Y.
Claim 4
Dependent Claim
9 words
The process of claim 1 wherein Ln is Gd.
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein the production of said elemental sulfur proceeds even in the presence of oxygen in said reaction chamber.
Claim 6
Dependent Claim
36 words
The process of claim 1 wherein said carbon monoxide or said hydrogen present in said gas stream is within ±15% of the stoichiometric amount required for the complete reduction of all oxidants in said gas stream.
Claim 7
Dependent Claim
25 words
The process of claim 1 wherein the temperature of said gas stream in said reaction chamber is from about 450° C to about 700° C.
Claim 8
Dependent Claim
18 words
The process of claim 1 wherein said derivatives include CoS 2 , and Gd 2 O 2 S.
Claim 9
Dependent Claim
22 words
The process of claim 1 wherein said derivatives include CoS 2 , Co 4 S 3 and Y 2 O 3 .
Claim 10
Dependent Claim
16 words
The process of claim 1 wherein said derivatives are supported on a magnesia or zirconia carrier.
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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |