US3645912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regeneration of unsupported vanadium sulfide catalyst
Assignee: Universal Oil Products Co
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Filing: 1970-02-02
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Granted: 1972-02-29
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Expires: 1990-02-02
Abstract
Abstract A CARBONIZED, UNSUPPORTED VANADIUM SULFIDE CATALYST IS REGENERATED WITH HYDROGEN SULFIDE OR ELEMENTAL SULFUR BY WAY OF A TWO-STAGE TREATMENT AT ELEVATED TEMPERATURES. THE FIRST STAGE IS EFFECTED AT TEMPERATURES ABOVE ABOUT 500*C., WHEREBY CARBON DISULFIDE IS FORMED, AND THE SECOND STAGE IS EFFECTED AT TEMPERATURES BELOW ABOUT 500* C., WHEREBY VANADIUM TETRASULFIDE IS FORMED. IN A PREFERRED METHOD, THE CARBONIZED CATALYST AND ELEMENTAL SULFUR ARE CONTACTED AND HEATED IN A HYDROGEN SULFIDE ATMOSPHERE. FURTHER, CARBON DISULFIDE MAY BE USED AT THE LOWER TEMPERATURE TO FORM THE VANADIUM TETRASULFIDE.
Inventors
- 👤 John G Gatsis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:50
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/02; C10G45/14; C10G45/16; B; B01; B01J; B01J27/00; B01J27/02; B01J27/04
Claims Analysis
Total Claims: 0
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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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |