US3862252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of selective hydrogenation of cyclopentadiene
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1973-12-27
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Granted: 1975-01-21
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Expires: 1993-12-27
Abstract
Abstract A method of producing cyclopentene by a selective hydrogenation of cyclopentadiene with molecular hydrogen using a catalyst consisting essentially of palladium or palladium and iron, impregnated on a magnesium oxide having a surface area smaller than 100 m2/g. The catalyst may be reactivated by heating at a temperature of 200* to 600*C.
Inventors
- 👤 Shoichi Matsumura
- 👤 Yasushi Kato
- 👤 Masakazu Uekita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:49
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/22; B01J37/24; B01J23/00; B01J23/38; B01J23/40; B01J23/44; B01J23/70; B01J23/89; B01J23/8906; B01J23/90; B01J23/96; B01J35/00; B01J35/60; C; C07; C07C; C07C5/00; C07C5/02; C07C5/03; C07C5/05; B01J35/61; B01J35/612; B01J35/613; C07C2523/00; C07C2523/38; C07C2523/40; C07C2523/44; C07C2523/70; C07C2523/74; C07C2523/745; C07C2523/89; C07C2601/00; C07C2601/06; C07C2601/10; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
39 words
A METHOD OF PRODUCING CYCLOPENTENE BY SELECTIVE HYDROGENATION OF CYCLOPENTADIENE WITH MOLECULAR HYDROGEN USING A CATALYST CONSISTING ESSENTIALLY OF PALLADIUM OR PALLADIUM AND IRON DISPOSED ON A CARRIER OF MAGNESIUM OXIDE HAVING A SURFACE AREA SMALLER THAN 100 M2/G.
Claim 2
Independent Claim
39 words
A METHOD OF PRODUCING CYCLOPENTENE BY SELECTIVE HYDROGENATION OF CYCLOPENTADIENE WITH MOLECULAR HYDROGEN USING A CATALYST CONSISTING ESSENTIALLY OF PALLADIUM OR PALLADIUM AND IRON DISPOSED ON A CARRIER OF MAGNESIUM OXIDE HAVING A SURFACE AREA SMALLER THAN 100 M2/G.
Claim 3
Dependent Claim
37 words
The method of claim 1, wherein said palladium is used in an amount of from 0.01 to 5.0 percent by weight, and said iron is used in an amount of from 0.01 to 5.0 percent by weight.
Claim 4
Dependent Claim
32 words
The method of claim 2, wherein said amount of palladium is from 0.01 to 2.0 percent by weight, and wherein said amount of iron is from 0.01 to 2.0 percent by weight.
Claim 5
Dependent Claim
37 words
The method of claim 1, wherein said selective hydrogenation is carried out at a temperature of from 50* to 250*C, at about atmospheric pressure and with hydrogen at a molar ratio to cyclopentadiene of 1.0 to 3.0.
Claim 6
Dependent Claim
22 words
The method of claim 4, wherein said temperature is from 70* to 180*C, and said molar ratio is from 1.0 to 2.0.
Claim 7
Dependent Claim
60 words
The process of claim 1, wherein said palladium or palladium and iron are disposed on said carrier by dipping said carrier into one or more compounds containing said palladium or palladium and iron, removing excess water therefrom, and reducing the resulting impregnated compound to a metallic state using an agent selected from the group consisting of hydrogen, hydrazine and formaldehyde.
Claim 8
Dependent Claim
18 words
The process of claim 5, wherein said hydrogenation is for a period of from 1 to 24 hours.
Claim 9
Dependent Claim
28 words
The process of claim 1, wherein said catalyst is reactivated after use in said hydrogenation reaction by exposing said catalyst to a temperature of from 200* to 600*C.
Claim 10
Dependent Claim
31 words
The process of claim 8, wherein said catalyst is exposed to said temperAture in a gas atmosphere flow; a gas ambient at atmospheric pressure, or a gas ambient at reduced pressure.
Claim 11
Dependent Claim
23 words
The process of claim 9, wherein said gas is selected from the group consisting of inert gases, hydrogen and oxygen-containing inert gas mixtures.
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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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |