US3825485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocracking effluent cooling prior to hydrodesulfurization
Assignee: Texaco Inc
•
Filing: 1972-09-07
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Granted: 1974-07-23
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Expires: 1992-09-07
Abstract
Abstract A RESIDUE-CONTAINING PETROLEUM FRACTION, 50 PERCENT BOILING ABOVE 1,000*F., IS HYDROCRACKED AND THEN HYDRODESULFURIZED. DURING THE ONSTREAM PERIOD, THE CONVERSION LEVEL OF MATERIAL BOILING ABOVE 1,000*F. IS MAINTAINED SUBSTANTIALLY CONSTANT WHILE THE SULFUR CONTENT OF THE HYDROCRACKED EFFLUENT INCREASES. THE SULFUR CONTENT OF A PRODUCT FRACTTION IS MAINTAINED SUBSTANTIALLY CONSTANT BY GRADUALLY INCREASING THE HYDROSULFURIZATION TEMPERATURE. THE EFFLUENT FROM THE HYDROCRACKING REACTTION IS COOLED BY ADDING AN AROMATIC-RICH FRACTION AND THE COOLED MIXTURE IS PASSED TO THE DESULFURIZATION REACTION.
Inventors
- 👤 W Coons
- 👤 J Colvert
- 👤 G Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:22
CPC Classifications
C; C10; C10G; C10G47/00
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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |