Production of 1,4-dicyanobutene-(2)
Abstract
Abstract A PROCESS FOR PRODUCING 1,4-DICYANOBUTENE-(2) IN WHICH AT LEAST ONE OF THE COMPOUNDS 1,2-DIBROMOBUTENE(3) OR 1,4-DIBROMOBUTENE-(2) IS REACTED WITH HYDROCYANIC ACID IN THE PRESENCE OF A COPPER SALT CATALYST. THE PROCESS TAKES PLACE IN THE PRESENCE OF AN AQUEOUS ACID MEDIUM AND IN THE PRESENCE OF AN ACID ACCEPTOR. DURING THE REACTION A PH OF FROM -1TO +3 IS MAINTAINED. THE HYDROGEN BROMIDE THAT IS PRESENT IN THE REACTION SOLUTION IS OXIDIZED TO ELEMENTARY BROMINE AND THE AQUEOUS SOLUTION CONTAINING THE ACID ACCEPTOR IS RECYCLED TO THE REACTION MIXTURE. THE RATE OF REACTION OF THE PROCESS IS CONSIDERABLY HIGHER THAN THAT OF CONVENTIONAL METHODS AND LOWER YIELDS OF BY-PRODUCTS ARE ACHIEVED.
Inventors
- 👤 Hans-Martin Weitz
- 👤 Franz Merger
- 👤 Juergen Koopmann
Bibliographic Details
Claims Analysis
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |