Patent US3937745A successfully refreshed from Google Patents.
US3937745A
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Selective hydrogenation of cyclopentadiene
Assignee: Goodyear Tire and Rubber Co
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Filing: 1974-08-29
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Granted: 1976-02-10
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Expires: 1994-08-29
Abstract
Abstract There is disclosed a method of selective hydrogenation of cyclopentadiene which comprises contacting cyclopentadiene with hydrogen in the presence of a catalyst comprising aluminum trialkyl and organonickel compounds. The preferred solvent system for the hydrogenation process is an aliphatic alcohol.
Inventors
- 👤 Lawson G. Wideman
- 👤 Henry R. Menapace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:32
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/16; B01J31/22; B01J31/2204; B01J31/2208; B01J31/2217; B01J31/02; B01J31/04; B01J31/12; B01J31/14; B01J31/143; B01J31/18; B01J31/1805; B01J31/20; B01J31/2226; B01J31/223; B01J31/2234; C; C07; C07C; C07C5/00; C07C5/02; C07C5/03; C07C5/05; B01J2231/00; B01J2231/60; B01J2231/64; B01J2231/641; B01J2231/645; B01J2531/00; B01J2531/80; B01J2531/84; B01J2531/847; C07C2531/00; C07C2531/02; C07C2531/04; C07C2531/12; C07C2531/14; C07C2531/16; C07C2531/20; C07C2531/22; C07C2601/00; C07C2601/06; C07C2601/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
85 words
In the method of selective hydrogenation of cyclopentadiene which comprises contacting cyclopentadiene with hydrogen and in contact with a homogeneous catalyst, the improvement which comprises utilizing as a homogeneous catalyst a mixture consisting of an aluminum trialkyl and an organonickel compound selected from the group consisting of nickel salts of carboxylic acids, nickel acetyacetonate, nickel salicaldehyde, bis(salicaldehyde) nickel, ethylene diamine nickel, bis(α-furyl dioxime) nickel and nickel tetracarbonyl in which the mole ratio of the trialkyl aluminum compound/nickel compound ranges from about 1.5/1 to about 10/1.
Claim 2
Dependent Claim
85 words
In the method of selective hydrogenation of cyclopentadiene which comprises contacting cyclopentadiene with hydrogen and in contact with a homogeneous catalyst, the improvement which comprises utilizing as a homogeneous catalyst a mixture consisting of an aluminum trialkyl and an organonickel compound selected from the group consisting of nickel salts of carboxylic acids, nickel acetyacetonate, nickel salicaldehyde, bis(salicaldehyde) nickel, ethylene diamine nickel, bis(α-furyl dioxime) nickel and nickel tetracarbonyl in which the mole ratio of the trialkyl aluminum compound/nickel compound ranges from about 1.5/1 to about 10/1.
Claim 3
Dependent Claim
15 words
The method according to claim 1 in which an alcohol is employed as a solvent.
Claim 4
Dependent Claim
19 words
The method according to claim 1 in which the hydrogen pressure ranges from about 100 to about 600 psig.
Claim 5
Dependent Claim
18 words
The method according to claim 1 in which the nickel compound is a salt of a carboxylic acid.
Claim 6
Dependent Claim
20 words
The method according to claim 1 in which the mole ratio of cyclopentadiene to nickel ranges from 100 to 3000.
Claim 7
Dependent Claim
71 words
The method according to claim 1 in which ethyl alcohol is employed as a solvent, the mole ratio of aluminum trialkyl to the organonickel compound ranges from about 2/1 to about 6/1, the hydrogen pressure ranges from about 100 to about 600 psig, the mole ratio of the cyclopentadiene to nickel ranges from about 500 to about 1000 and in which the organonickel compound is a salt of a carboxylic acid.
References Cited (Backward Citations)
US3692852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |