Patent US3947560A successfully refreshed from Google Patents.
US3947560A
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Process for oxidizing sulfur dioxide
Assignee: Eneos Corp
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Filing: 1974-03-05
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Granted: 1976-03-30
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Expires: 1994-03-05
Abstract
Abstract A process for oxidizing sulfur dioxide which comprises contacting a gas containing sulfur dioxide and a gas containing oxygen with an aqueous solution containing at least 3 ppm each of a pentavalent vanadium ion and a divalent manganese ion.
Inventors
- 👤 Masao Nambu
- 👤 Syunichi Yamamoto
- 👤 Hideo Machida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:05
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/74; C01B17/76; C01B17/775
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
113 words
In a process for removing sulfur dioxide from a gas stream containing the same prior to passing said gas stream to the ambient atmosphere by converting the sulfur dioxide in a low temperature, liquid phase, catalytic reaction to sulfuric acid, the improvement comprising contacting the sulfur dioxide containing gas stream and a gas containing oxygen with an acidic aqueous solution containing from 3 ppm to 8000 ppm of pentavalent vanadium ion and from 3 to 200 ppm of a divalent manganese ion at a temperature in the range of 0° to 100° C and continuing said contact until the concentration of sulfuric acid in said aqueous solution reaches up to 55% by weight.
Claim 2
Dependent Claim
113 words
In a process for removing sulfur dioxide from a gas stream containing the same prior to passing said gas stream to the ambient atmosphere by converting the sulfur dioxide in a low temperature, liquid phase, catalytic reaction to sulfuric acid, the improvement comprising contacting the sulfur dioxide containing gas stream and a gas containing oxygen with an acidic aqueous solution containing from 3 ppm to 8000 ppm of pentavalent vanadium ion and from 3 to 200 ppm of a divalent manganese ion at a temperature in the range of 0° to 100° C and continuing said contact until the concentration of sulfuric acid in said aqueous solution reaches up to 55% by weight.
Claim 3
Dependent Claim
30 words
The improved process of claim 1 wherein said aqueous solution contains 10 to 8,000 ppm of said pentavalent vanadium ion and 5 to 200 ppm of said divalent manganese ion.
Claim 4
Dependent Claim
26 words
The improved process of claim 2 wherein said oxygen containing gas is air and said contact is conducted at a temperature of 20° to 70° C.
Claim 5
Dependent Claim
19 words
The improved process of claim 1 wherein a single gas stream contains both of the sulfur dioxide and oxygen.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |