Patent US1898670A successfully refreshed from Google Patents.
Patent US4186146A successfully refreshed from Google Patents.
US4186146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogenation of aromatic nitriles to primary amines
Assignee: Sunoco Inc R&M
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Filing: 1979-02-01
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Granted: 1980-01-29
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Expires: 1999-02-01
Abstract
Abstract In the process of hydrogenating aromatic nitriles to primary amines whereby the nitrile is hydrogenated in a solvent system containing added ammonia using a cobalt or nickel catalyst, the improvement of employing an ether as solvent and carrying out the hydrogenation in the presence of water in an amount of from about 10% to about 20% by volume of the ether solvent whereby the rate of reaction is increased, secondary amine by-products are reduced and catalyst may be recycled without adverse effects.
Inventors
- 👤 Walter A. Butte, Jr.
- 👤 William J. Murtaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:40
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/44; C07C209/48; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
In the process of hydrogenating aromatic nitriles to primary amines whereby the nitrile is hydrogenated in a solvent system containing added ammonia using a cobalt or nickel catalyst, the improvement of employing as solvent an ether containing four to six carbon atoms and carrying out the hydrogenation in the presence of water in an amount of from about 10% to about 20% by volume of the ether solvent whereby the rate of reaction is increased, secondary amine by-products are reduced and catalyst may be recycled without adverse effects.
Claim 2
Dependent Claim
88 words
In the process of hydrogenating aromatic nitriles to primary amines whereby the nitrile is hydrogenated in a solvent system containing added ammonia using a cobalt or nickel catalyst, the improvement of employing as solvent an ether containing four to six carbon atoms and carrying out the hydrogenation in the presence of water in an amount of from about 10% to about 20% by volume of the ether solvent whereby the rate of reaction is increased, secondary amine by-products are reduced and catalyst may be recycled without adverse effects.
Claim 3
Dependent Claim
93 words
In the process of hydrogenating aromatic nitriles of the benzene and naphthalene series to primary amines whereby the nitrile is hydrogenated in a solvent system containing added ammonia using a cobalt or nickel catalyst, the improvement of employing a 4 or 5 carbon cyclic ether as solvent and carrying out the hydrogenation in the presence of water in an amount of from about 10% to about 20% by volume of the ether solvent whereby the rate of reaction is increased, secondary amine by-products are reduced and catalyst may be recycled without adverse effects.
Claim 4
Dependent Claim
93 words
In the process of hydrogenating aromatic nitriles of the benzene and naphthalene series to primary amines whereby the nitrile is hydrogenated in a solvent system containing added ammonia using a cobalt or nickel catalyst, the improvement of employing a 4 or 5 carbon cyclic ether as solvent and carrying out the hydrogenation in the presence of water in an amount of from about 10% to about 20% by volume of the ether solvent whereby the rate of reaction is increased, secondary amine by-products are reduced and catalyst may be recycled without adverse effects.
Claim 5
Dependent Claim
15 words
The process of claim 2 where the nitrile is a member of the benzene series.
Claim 6
Dependent Claim
11 words
The process of claim 2 where the ether solvent is tetrahydrofuran.
Claim 7
Dependent Claim
11 words
The process of claim 2 where the cyclic ether is dioxane.
Claim 8
Dependent Claim
10 words
The process of claim 4 where the nitrile is terephthalonitrile.
Claim 9
Dependent Claim
17 words
The process of claim 6 where the range of water is from about 10% to about 15%.
Claim 10
Dependent Claim
13 words
The process of claim 7 where the catalyst is supported cobalt or nickel.
Claim 11
Dependent Claim
14 words
The process of claim 7 where the catalyst is Raney nickel or Raney cobalt.
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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) | 1983-01-28 | 1983-07-30 | 1984-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-28 | 1987-07-30 | 1988-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-28 | 1991-07-30 | 1992-01-29 | $7700.00 | Window Closed / Lapsed |