Patent US4167529A successfully refreshed from Google Patents.
US4167529A
Expired / Lapsed
US
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Selective hydrogenation of cyclopentadiene to form cyclopentene using Raney nickel catalyst and ammonium hydroxide in the reaction mixture
Assignee: Goodyear Tire and Rubber Co
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Filing: 1977-11-11
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Granted: 1979-09-11
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Expires: 1997-11-11
Abstract
Abstract There is disclosed a process for the preparation of cyclopentene which comprises selectively hydrogenating cyclopentadiene in the liquid phase by contacting cyclopentadiene with hydrogen in the presence of a hydrogenation catalyst comprising a highly dispersed form of nickel in which ammonium hydroxide is employed in the reaction mixture.
Inventors
- 👤 Lawson G. Wideman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:09
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/02; C07C5/03; C07C5/05; C07C2525/00; C07C2525/02; C07C2601/00; C07C2601/06; C07C2601/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
71 words
The process for the preparation of cyclopentene which comprises selectively hydrogenating cyclopentadiene in the liquid phase by contacting cyclopentadiene with hydrogen in the presence of a hydrogenation catalyst comprising a highly dispersed form of nickel selected from the group consisting of Ranel nickel or modified Ranel nickel in which ammonium hydroxide is employed in the reaction mixture in the volume ratio of ammonium hydroxide to cyclopentadiene of from 1/1 to 4/1.
Claim 2
Dependent Claim
71 words
The process for the preparation of cyclopentene which comprises selectively hydrogenating cyclopentadiene in the liquid phase by contacting cyclopentadiene with hydrogen in the presence of a hydrogenation catalyst comprising a highly dispersed form of nickel selected from the group consisting of Ranel nickel or modified Ranel nickel in which ammonium hydroxide is employed in the reaction mixture in the volume ratio of ammonium hydroxide to cyclopentadiene of from 1/1 to 4/1.
Claim 3
Dependent Claim
16 words
A process according to claim 1 in which the temperature ranges from 20° to 30° C.
Claim 4
Dependent Claim
19 words
The process according to claim 1 in which the pressure of the hydrogen is at least 150 psig--1035.5 kPa.
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) | 1982-09-10 | 1983-03-12 | 1983-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-10 | 1987-03-12 | 1987-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-10 | 1991-03-12 | 1991-09-11 | $7700.00 | Window Closed / Lapsed |