US3591522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reactivation of group viii selective hydrogenation catalysts
Assignee: Individual
•
Filing: 1969-06-13
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Granted: 1971-07-06
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Expires: 1989-06-13
Abstract
Abstract IN THE SELECTIVE HYDROGENATION OF HIGHLY UNSATURATED COMPOUNDS, SUCH AS ACETYLENES AND CONJUGATED OLEFINS, TO MONOETHYLENIC HYDROCARBONS, SAID RECATION BEING CONDUCTED AT ABOUT 0-250*C. IN THE PRESENCE OF A GROUP VIII METAL, THE CATALYST BECOMES DEACTIVATED BECAUSE OF THE DEPOSIT OF POLYMERIC OR RUBBERY-LIKE MATERIAL, AND SOMETIMES IT IS POISIONED BY SULFUROUS IMPURITIES. THE CATALYST IS RECATIVATED BY WASHING IT WITH INERT LIQUID HYDROCARBON AT BELOW 200*C., AND IN SUBSEQUENT STEPS, SEPARATING THE WASHED CATALYST FROM THE LIQUID, AND THEN CONTACTING THE SEPARATED CATALYST WITH HYDROGEN AT 200-500*C.
Inventors
- 👤 Jean Cosyns
- 👤 Jean-Francois Le Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:52
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/32; C10G45/34; B; B01; B01J; B01J23/00; B01J23/90; B01J23/94; B01J23/96; C07; C07F; C07F7/00; C07F7/22; C07F7/226; C08; C08K; C08K5/00; C08K5/56; C08K5/57; C08K5/58; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584; Y10; Y10S; Y10S502/00; Y10S502/515; Y10S502/517; Y10S585/00; Y10S585/8995; Y10S585/901
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |