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US3558709A
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US
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Process for the preparation of amines or diamines by the catalytic hydrogenation of nitriles and dinitriles
Assignee: Huels AG
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Filing: 1968-04-19
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Granted: 1971-01-26
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Expires: 1988-04-19
Abstract
Abstract IN A PROCESS FOR THE SEPARATION OF AN AMINE BY THE CATALYTIC HYDROGENATION OF A NITRILE, THE IMPROVEMENT COMPRISING EMPLOYING AS THE CATALYST A COMPOSITE CATALYST CONSISTING ESSENTIALLY OF A SUPPORT OF A LARGE-PORE A-ALUMINUM OXIDE HAVING A CRYSTALLINE PROPORTION OF A-ALUMINUM OXIDE OF MORE THAN 70% BY WEIGHT, A SPECIFIC SURFACE OF BETWEEN 0.5 AND 30 M.2/G., AND A WATER ABSORPTION OF BETWEEN 30 AND 60 CM.3/100G.; AND COATED ON SAID SUPPORT COBALT IN A PROPORTION OF ABOUT 5-35% OF THE TOTAL CATALYST.
Inventors
- 👤 Gunter Hockele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:52
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/74; B01J23/75; C; C07; C07C; C07C209/00; C07C209/44; C07C209/48
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |