US3684740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regeneration of platinum group metal-alpha alumina catalyst
Assignee: Atlantic Richfield Co
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Filing: 1969-06-10
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Granted: 1972-08-15
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Expires: 1989-06-10
Abstract
Abstract A NEW METHOD FOR REGENERATING A HYDROGENATION OF DEHYDROGENATION CATALYST OF A PLATINUM-GROUP METAL ON ALPHA-ALUMINA IS DISCLOSED. THE REACTOR CONTAINING THE CATALYST IS FIRST HEATED WITH AN OXIDIZING GAS TO BURN OFF DEPOSITED CARBONACEOUS MATERIAL. AFTER THE BURNING, THE CATALYST IS COOLED AND WASHED WITH LIQUID PHASE WATER FOR A TIME SUFFICIENT TO REMOVE IMPURITIES. THIS BURN AND WATER-WASH REGENERATION PROCEDURE CAN RESTORE THE CATALYST ACTIVITY AND SELECTIVITY TO SUBSTANTIALLY VIRGIN LEVELS.
Inventors
- 👤 Robert N Cimbalo
- 👤 Allen R Broyles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:27
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/90; B01J23/96; C; C07; C07C; C07C5/00; C07C5/02; C07C5/08; C07C2523/00; C07C2523/38; C07C2523/40; C07C2523/44; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
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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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |