Patent US3758584A successfully refreshed from Google Patents.
US3758584A
Expired / Lapsed
US
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Hydrogenation of adiponitrile
Assignee: EIDP Inc
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Filing: 1970-12-23
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Granted: 1973-09-11
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Expires: 1990-12-23
Abstract
Abstract Process for the catalytic hydrogenation of adiponitrile to hexamethylenediamine at elevated temperatures and pressures in the presence of a catalyst derived from an iron or cobalt compound which has been activated in a mixture of hydrogen and ammonia at a temperature in the range of about 300* C. to about 600* C.
Inventors
- 👤 D Bivens
- 👤 L Patton
- 👤 W Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:08
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/44; C07C209/48; B; B01; B01J; B01J23/00; B01J23/70
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
17 words
The process of claim 1 wherein the metal compound is an oxide of iron in granular form.
Claim 2
Dependent Claim
23 words
The process of claim 2 wherein the iron compound is activated in hydrogen containing from 0.25 to 3 percent by volume of ammonia.
Claim 3
Dependent Claim
27 words
The process of claim 3 wherein the activation of the iron compound is carried out at a temperature in the range of 350* C. to 420* C.
Claim 4
Dependent Claim
28 words
The process of claim 4 wherein the activation of the iron compound is carried out in hydrogen at a pressure in the range of 0.1 to 10 atmospheres.
Claim 5
Dependent Claim
54 words
The process of claim 5 wherein the hydrogenation is carried out at a temperature in the range of about 90* C. to about 200* C. at a hydrogen pressure of about 250 to about 400 atmospheres in the presence of ammonia in a weight ratio of ammonia to adiponitrile of at least about 1.8/1.
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein the metal compound is an oxide of cobalt.
References Cited (Backward Citations)
US2956075A
Cited
US3235600A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |