US3635838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regeneration of unsupported vanadium sulfide catalyst
Assignee: Universal Oil Products Co
•
Filing: 1970-02-02
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Granted: 1972-01-18
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Expires: 1990-02-02
Abstract
Abstract A carbonized, unsupported nonstoichiometric vanadium sulfide catalyst is regenerated by way of a three-stage treatment at elevated temperatures. In the first stage, carbon is removed from the catalyst by contacting with elemental sulfur at an elevated temperature in the range of about 500* to about 1,000* C. The substantially carbon-free catalyst is treated with a mineral acid, or anhydrous HF, to dissolve metallic contaminants, and further treated in a third stage with elemental sulfur at a temperature in the range of 300* to about 500* C. to form vanadium tetrasulfide.
Inventors
- 👤 John G Gatsis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:27
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/02; C10G45/14; C10G45/16; B; B01; B01J; B01J27/00; B01J27/02; B01J27/04; Y; Y10; Y10S; Y10S502/00; Y10S502/515; Y10S502/516; Y10S502/518
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
15 words
The process of claim 1 further characterized in that said mineral acid is sulfuric acid.
Claim 2
Dependent Claim
15 words
The process of claim 1 further characterized in that said mineral acid is hydrochloric acid.
Claim 3
Dependent Claim
15 words
The process of claim 1 further characterized in that said mineral acid is hydrofluoric acid.
Claim 4
Dependent Claim
33 words
The process of claim 1 further characterized in that said catalyst is decarbonized by heating in contact with elemental sulfur at a temperature in the range of 700* C. to about 1,000* C.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |