US3718691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of aqueous thiosulfate solutions containing formate with carbon monoxide
Assignee: C0NSOLIDATION COAL Co
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Filing: 1972-04-12
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Granted: 1973-02-27
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Expires: 1992-04-12
Abstract
Abstract Sodium, potassium, or ammonium thiosulfate is converted in one stage to the corresponding formate and H2S by heating the thiosulfate to an elevated temperature above 475*F. in the presence of carbon monoxide, steam, and one of the following: sodium, potassium, and ammonium formates.
Inventors
- 👤 P Yavorsky
- 👤 E Gorin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:26
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/16; C01B17/164; C07; C07C; C07C51/00; C07C51/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
13 words
The process according to claim 1 wherein H2 is added to the CO.
Claim 2
Dependent Claim
13 words
The process according to claim 1 wherein CO2 is added to the CO.
Claim 3
Dependent Claim
13 words
The process according to claim 1 wherein said mixture is in aqueous solution.
Claim 4
Dependent Claim
23 words
The process according to claim 4 wherein the temperature is between 500* and 600*F. and the pressure is between 750 and 1,000 psi.
Claim 5
Dependent Claim
16 words
The process according to claim 5 wherein the thiosulfate and the formate are the potassium salts.
Claim 6
Dependent Claim
36 words
The process which comprises reacting MSH WITH CO and H2O at a temperature above 475* F and at a pressure above 500 psi, to thereby make MOOCH and H2S, where M is Na, K, or NH4.
References Cited (Backward Citations)
US3584042A
Cited
US3592850A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |