US3796796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for converting hydrogen sulfide and sulfur dioxide to elemental sulfur
Assignee: IFP Energies nouvelles
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Filing: 1971-11-18
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Granted: 1974-03-12
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Expires: 1991-11-18
Abstract
Abstract SULFUR IS OBTAINED BY REACTING HYDROGEN SULFIDE WITH SULFUR DIOXIDE IN CONTACT WITH A LIQUID PHASE CONTAINING A SELECTED ALCOHOL, POLYOL, POLYALKYLENEGLYCOL OR ETHER THEREOF. AN ESSENTIAL FEATURE IS THE USE OF A CATALYST WHICH IS BOTH A PARTIAL ESTER AND A PARTIAL SALT OF METAL I1 OR IIA FROM AN ORGANIC POLYCARBOXYLIC ACID. THIS CATALYST IS HIGHLY ACTIVE AND STABLE OVER LONG PERIODS, THE ACITIVITY DECREASE BEING, FOR EXAMPLE, LESS THAN ABOUT 1.5% AFTER 20 HOURS OF RUN.
Inventors
- 👤 A Deschamps
- 👤 C Dezael
- 👤 P Renault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:30
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |