Patent US2749359A successfully refreshed from Google Patents.
US2749359A
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Hydrogenation of dicyanobutene in the presence of a neutralized palladium catalyst
Assignee: EIDP Inc
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Filing: 1953-01-06
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Granted: 1956-06-05
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Expires: 1973-01-06
Abstract
No abstract record available.
Inventors
- 👤 William H Calkins
- 👤 Donald E Welton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:42
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/44; C; C07; C07C; C07C255/00; B01J21/00; B01J21/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
THE PROCESS OF PRODUCING ADIPONITRILE IN A GAS-PHASE, CATALYTIC HYDROGENATION REACTION WHICH COMPRISES FORMING A GASEOUS MIXTURE OF 1,4-DICYANOBUTENE AND FROM 10 TO 100 MOLS OF HYDROGEN PER MOL OF 1,4-DICYANOBUTENE; AND PASSING SAID MIXTURE, AT A PRESSURE OF 0.5 TO 5.0 ATMOSPHERES AND AT A TEMPERATURE OF 200* C. TO 350* C., IN CONTACT WITH A PALLADIUM-ON-COCONUT-CHARCOAL CATALYST PREPARED BY DEPOSITING PALLADIUM ON THE SURFACE OF ALKALINE COCONUT CHARCOAL PARTICLES, TREATING THE PALLADIUMCOATED CATALYST BY WASHING WITH FORMIC ACID FOLLOWED BY WASHING WITH WATER, DRYING THE CATALYST, AND REDUCING THE DRIED CATALYST WITH HYDROGEN.
Claim 2
Dependent Claim
95 words
THE PROCESS OF PRODUCING ADIPONITRILE IN A GAS-PHASE, CATALYTIC HYDROGENATION REACTION WHICH COMPRISES FORMING A GASEOUS MIXTURE OF 1,4-DICYANOBUTENE AND FROM 10 TO 100 MOLS OF HYDROGEN PER MOL OF 1,4-DICYANOBUTENE; AND PASSING SAID MIXTURE, AT A PRESSURE OF 0.5 TO 5.0 ATMOSPHERES AND AT A TEMPERATURE OF 200* C. TO 350* C., IN CONTACT WITH A PALLADIUM-ON-COCONUT-CHARCOAL CATALYST PREPARED BY DEPOSITING PALLADIUM ON THE SURFACE OF ALKALINE COCONUT CHARCOAL PARTICLES, TREATING THE PALLADIUMCOATED CATALYST BY WASHING WITH FORMIC ACID FOLLOWED BY WASHING WITH WATER, DRYING THE CATALYST, AND REDUCING THE DRIED CATALYST WITH HYDROGEN.
References Cited (Backward Citations)
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US2344208A
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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) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |