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Patent US4088672A successfully refreshed from Google Patents.
US4088672A
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Preparation of dicyanobutenes from 3-pentenenitrile
Assignee: Imperial Chemical Industries Ltd
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Filing: 1975-04-25
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Granted: 1978-05-09
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Expires: 1995-04-25
Abstract
Abstract Dinitriles are obtained by heating an olefinically unsaturated mononitrile in presence of an olefin disproportionation catalyst, for example, 3-pentenenitrile gives dicyanobutenes.
Inventors
- 👤 Dhafir Y. Waddan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:54
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
62 words
A process for the manufacture of dicyanobutenes from 3-pentenenitrile consisting essentially of heating an olefinically unsaturated feed consisting essentially of 3-pentenenitrile at 20° to 450° C with an olefin disproportionation catalyst selected from the group consisting of an oxide or carbonyl of tungsten, molybdenum, rhenium, rhodium, iridium, osmium, ruthenium, niobium, tantalum, tellurium, lanthanum, thorium, vanadium, or tin, tungsten hexachloride or mixtures thereof.
Claim 2
Dependent Claim
62 words
A process for the manufacture of dicyanobutenes from 3-pentenenitrile consisting essentially of heating an olefinically unsaturated feed consisting essentially of 3-pentenenitrile at 20° to 450° C with an olefin disproportionation catalyst selected from the group consisting of an oxide or carbonyl of tungsten, molybdenum, rhenium, rhodium, iridium, osmium, ruthenium, niobium, tantalum, tellurium, lanthanum, thorium, vanadium, or tin, tungsten hexachloride or mixtures thereof.
Claim 3
Dependent Claim
19 words
The process of claim 1 in which the catalyst is an oxide or carbonyl of tungsten, molybdenum or rhenium.
Claim 4
Dependent Claim
46 words
The process of claim 1 in which the catalyst is an oxide or carbonyl of rhodium, iridium, osmium, ruthenium, niobium, tantalum, tellurium, lanthanum, thorium, vanadium, or tin, either alone or in admixture with each other or with an oxide or carbonyl of tungsten, molybdenum or rhenium.
Claim 5
Dependent Claim
20 words
The process of claim 2 in which the catalyst is molybdenum or tungsten and is promoted with cobalt or chromium.
Claim 6
Dependent Claim
23 words
A process as claimed in claim 1 in which the catalyst is molybdenum hexacarbonyl or tungsten hexachloride or a mixture of the two.
Claim 7
Dependent Claim
13 words
A process as claimed in claim 1 carried out in the liquid phase.
Claim 8
Dependent Claim
13 words
A process as claimed in claim 1 carried out in the vapour phase.
Claim 9
Dependent Claim
18 words
The process of claim 5 in which the tungsten hexachloride is used in conjunction with a reducing agent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |