US4083809A
Expired / Lapsed
US
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Hydrogenation catalyst and method of producing same
Assignee: ISP Investments LLC
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Filing: 1976-08-20
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Granted: 1978-04-11
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Expires: 1996-08-20
Abstract
Abstract Hydrogenation catalyst and a process for producing gamma-butyrolactone by hydrogenating a feed compound -- selected from the group consisting of maleic acid, succinic acid, maleic anhydride, succinic anhydride, and mixtures of any of the foregoing -- in the vapor phase, in the presence of said catalyst, which is a highly selective elemental Cu-Pd or Cu-Pt catalyst, in order to produce high yields of gamma-butyrolactone and minimize the formation of by-products.
Inventors
- 👤 Waldo De Thomas
- 👤 Eugene V. Hort
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:27
CPC Classifications
C; C07; C07D; C07D315/00; B; B01; B01J; B01J23/00; B01J23/70; B01J23/89; B01J23/8926
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
A hydrogenation catalyst for the selective conversion of a feed compound selected from the group consisting of maleic acid, succinic acid, maleic anhydride, and succinic anhydride to gamma-butyrolactone in the vapor phase by hydrogenation consisting essentially of: a. an intimate admixture consisting of essentially metallic copper with a small amount of elemental metallic palladium or platinum therewith, on a magnesium silicate non-acidic carrier, wherein: b. said metals comprise about 4-30% by weight of said admixture, and c. the weight ratio of copper to said palladium or platinum being about 10:1 to about 500:1.
Claim 2
Dependent Claim
93 words
A hydrogenation catalyst for the selective conversion of a feed compound selected from the group consisting of maleic acid, succinic acid, maleic anhydride, and succinic anhydride to gamma-butyrolactone in the vapor phase by hydrogenation consisting essentially of: a. an intimate admixture consisting of essentially metallic copper with a small amount of elemental metallic palladium or platinum therewith, on a magnesium silicate non-acidic carrier, wherein: b. said metals comprise about 4-30% by weight of said admixture, and c. the weight ratio of copper to said palladium or platinum being about 10:1 to about 500:1.
Claim 3
Dependent Claim
139 words
A hydrogenation catalyst for the selective conversion of a feed compound selected from the group consisting of maleic acid, succinic acid, maleic anhydride, and succinic anhydride to gamma-butyrolactone in the vapor phase by hydrogenation consisting essentially of: a. an intimate admixture consisting of essentially metallic copper with a small amount of elemental metallic palladium or platinum therewith, on a non-acidic carrier selected from the group consisting of magnesium silicate, asbestos, kieselguhr, and silica gel, wherein: b. said metals comprise about 4-30% by weight of said admixture, and c. the weight ratio of copper to said palladium or platinum being about 10:1 to about 500:1, wherein said admixture is prepared from a solution of soluble copper and palladium or platinum salts on a carrier from which copper and palladium or platinum has been precipitated and then converted to elemental form.
Claim 4
Dependent Claim
139 words
A hydrogenation catalyst for the selective conversion of a feed compound selected from the group consisting of maleic acid, succinic acid, maleic anhydride, and succinic anhydride to gamma-butyrolactone in the vapor phase by hydrogenation consisting essentially of: a. an intimate admixture consisting of essentially metallic copper with a small amount of elemental metallic palladium or platinum therewith, on a non-acidic carrier selected from the group consisting of magnesium silicate, asbestos, kieselguhr, and silica gel, wherein: b. said metals comprise about 4-30% by weight of said admixture, and c. the weight ratio of copper to said palladium or platinum being about 10:1 to about 500:1, wherein said admixture is prepared from a solution of soluble copper and palladium or platinum salts on a carrier from which copper and palladium or platinum has been precipitated and then converted to elemental form.
Claim 5
Dependent Claim
31 words
A hydrogenation catalyst according to claim 2 wherein said conversion is effected by reduction by heating in hydrogen below 300° C after drying and calcining the precipitating salts on a carrier.
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) | 1981-04-10 | 1981-10-10 | 1982-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-10 | 1985-10-10 | 1986-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-10 | 1989-10-10 | 1990-04-11 | $7700.00 | Window Closed / Lapsed |