Patent US3857894A successfully refreshed from Google Patents.
US3857894A
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Hydrogenation of cyclic hydrocarbon diolefins to cyclic hydrocarbon olefins
Assignee: SnamProgetti SpA
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Filing: 1973-07-24
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Granted: 1974-12-31
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Expires: 1993-07-24
Abstract
Abstract A process is described whereby a diolefin is selectively hydrogenated to an olefin in the presence of a palladium base catalyst by adding to the reaction mixture an aqueous solution of a zinc salt such as zinc acetate wherein the ratio of water/zinc is at least 1/1 by weight.
Inventors
- 👤 M Morelli
- 👤 Marco F De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:36
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/02; C07C5/03; C07C5/05; C07C2523/00; C07C2523/38; C07C2523/40; C07C2523/44; C07C2527/00; C07C2527/02; C07C2527/053; C07C2527/06; C07C2527/138; C07C2527/24; C07C2527/25; C07C2531/00; C07C2531/02; C07C2531/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
66 words
A PROCESS OF HYDROGENATING A CYCLIC HYDROCARBON DIOLEFIN BY CONTACTING SAID CYCLIC DIOLEFIN WITH HYDROGEN IN THE PRESENCE OF A PALLADIUM BASE CATALYST, WHEREIN THE IMPROVEMENT COMPRISES INCREASING THE SELECTIVITY OF THE HYDROGENATION OF SAID CYCLIC HYDROCARBON DIOLEFIN TO CYCLIC HYDROCARBON OLEFIN BY ADDING TO THE HYDROGENATION MIXTURE AN AQUEOUS SOLUTION OF A ZINC SALT HAVING A RATIO OF WATER/ZINC OF AT LEAST 1/1 BY WEIGHT.
Claim 2
Dependent Claim
66 words
A PROCESS OF HYDROGENATING A CYCLIC HYDROCARBON DIOLEFIN BY CONTACTING SAID CYCLIC DIOLEFIN WITH HYDROGEN IN THE PRESENCE OF A PALLADIUM BASE CATALYST, WHEREIN THE IMPROVEMENT COMPRISES INCREASING THE SELECTIVITY OF THE HYDROGENATION OF SAID CYCLIC HYDROCARBON DIOLEFIN TO CYCLIC HYDROCARBON OLEFIN BY ADDING TO THE HYDROGENATION MIXTURE AN AQUEOUS SOLUTION OF A ZINC SALT HAVING A RATIO OF WATER/ZINC OF AT LEAST 1/1 BY WEIGHT.
Claim 3
Dependent Claim
33 words
A process of hydrogenating a cyclic hydrocarbon diolefin according to claim 1, wherein the amount of said zinc salt is from 0.01 percent to 5 percent by weight of the cyclic hydrocarbon diolefin.
Claim 4
Dependent Claim
33 words
A process of hydrogenating a cyclic hydrocarbon diolefin according to claim 1, wherein the hydrogenation is carried out at temperatures ranging from 20* to 60*C and at pressures between 1 and 50 atmospheres.
Claim 5
Dependent Claim
41 words
A process of hydrogenating a cyclic hydrocarbon diolefin according to claim 1, wherein the hydrogenation is carried out in the presence of an amine compound in the amount of not more than 0.5 percent by weight of the cyclic hydrocarbon diolefin.
Claim 6
Dependent Claim
18 words
A process of hydrogenating a cyclic hydrocarbon diolefin according to claim 4, wherein the amine compound is ammonia.
Claim 7
Dependent Claim
35 words
A process of hydrogenating a cyclic hydrocarbon diolefin according to claim 1, wherein the zinc salt is a member of the group consisting of zinc chloride, zinc sulfate, zinc nitrate, zinc acetate and zinc oxalate.
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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) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |