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Patent US3674848A successfully refreshed from Google Patents.
US3674848A
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Hydration of nitriles using metal salts of cation exchange resins
Assignee: Wyeth Holdings LLC
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Filing: 1970-08-19
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Granted: 1972-07-04
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Expires: 1990-08-19
Abstract
Abstract Solid catalysts for hydration of nitriles to amides comprise metal salts of cation exchange resins. Group I B and II B metals are used with either strong acid or weak acid cation exchange resins. A variety of organic nitriles may be used in the process. Detailed examples describe preparation of several catalysts and the synthesis of acrylamide, acetamide and benzamide. The reactants in liquid solution are contacted with the solid catalyst at 70* - 180* C.
Inventors
- 👤 Erwin Frederick Schoenbrunn
- 👤 Vinod Tarkeshwar Sinha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:00
CPC Classifications
C; C07; C07C; C07C231/00; C07C231/06; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
17 words
A process defined by claim 1 wherein said nitrile is acrylonitrile and said amide product is acrylamide.
Claim 2
Dependent Claim
18 words
A process defined by claim 1 wherein said acid cation exchange resin is a weak-acid ion exchange resin.
Claim 3
Dependent Claim
17 words
A process defined by claim 2 wherein said ion exchange resin is a weak-acid ion exchange resin.
Claim 4
Dependent Claim
17 words
A process defined by claim 1 wherein said ion exchange resin is a strong-acid ion exchange resin.
Claim 5
Dependent Claim
17 words
A process defined by claim 2 wherein said ion exchange resin is a strong-acid ion exchange resin.
Claim 6
Dependent Claim
20 words
A process defined by claim 4 wherein said salt is the zinc salt of a weak acid cation exchange resin.
Claim 7
Dependent Claim
20 words
A process defined by claim 6 wherein said salt is the cuprous salt of a strong acid cation exchange resin.
Claim 8
Dependent Claim
25 words
A process defined by claim 1 wherein said nitrile is acetonitrile and said catalyst is the silver salt of a weak acid cation exchange resin.
Claim 9
Dependent Claim
25 words
A process defined by claim 1 wherein said nitrile is benzonitrile and said catalyst is the silver salt of a weak acid cation exchange resin.
References Cited (Backward Citations)
US2421030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |