Patent US4383940A successfully refreshed from Google Patents.
US4383940A
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Catalysts for hydrogenation of unsaturated dinitriles
Assignee: Phillips Petroleum Co
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Filing: 1981-11-30
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Granted: 1983-05-17
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Expires: 2001-11-30
Abstract
Abstract Unsaturated dinitriles are hydrogenated to saturated diamines using a rhodium catalyst on a silica support having a surface area larger than 275 m 2 /g, a pore volume of from about 1.0 to 1.5 mL/g and an average pore size of from about 100 to about 175 A. The supported rhodium catalyst is prepared by a method which includes the steps of contacting a silica support having the characteristics described above with a solution or dispersion of rhodium or a reducible compound of rhodium, and then subjecting the impregnated silica support to vacuum treatment.
Inventors
- 👤 Timothy P. Murtha
- 👤 Charles A. Drake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:36
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/44; C07C209/48; B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/46; B01J23/464; B01J35/00; B01J35/60; B01J35/61; B01J35/615; B01J35/63; B01J35/635; B01J35/64; B01J35/647
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
142 words
A process for preparing a hydrogenation catalyst comprising the steps of contacting a silica support having a surface area of at least about 275 m 2 /g, a pore volume of from about 1.0 to about 1.5 mL/g and an average pore size of from about 100 to about 175 A with a liquid solution of a substance selected from rhodium and reducible compounds of rhodium so as to incorporate within the hydrogenation catalyst from about 0.05 to about 30 weight percent of rhodium; drying the thus-contacted silica support under a vacuum of from about 10 -4 to about 20 mm Hg at a temperature of about 20° to about 250° C. for a time of about 15 minutes to about 30 hours; and contacting the thus-dried silica support with a reducing agent under reducing conditions to produce a rhodium-containing hydrogenation catalyst.
Claim 2
Dependent Claim
142 words
A process for preparing a hydrogenation catalyst comprising the steps of contacting a silica support having a surface area of at least about 275 m 2 /g, a pore volume of from about 1.0 to about 1.5 mL/g and an average pore size of from about 100 to about 175 A with a liquid solution of a substance selected from rhodium and reducible compounds of rhodium so as to incorporate within the hydrogenation catalyst from about 0.05 to about 30 weight percent of rhodium; drying the thus-contacted silica support under a vacuum of from about 10 -4 to about 20 mm Hg at a temperature of about 20° to about 250° C. for a time of about 15 minutes to about 30 hours; and contacting the thus-dried silica support with a reducing agent under reducing conditions to produce a rhodium-containing hydrogenation catalyst.
Claim 3
Dependent Claim
43 words
The process of claim 1 in which the vacuum treatment is carried out at from about 10 -2 to 20 mm Hg, a temperature from about 40° to about 200° C. and a time of from about 1 hour to about 24 hours.
Claim 4
Dependent Claim
33 words
The process of claim 1 in which the reducible compounds of rhodium are selected from the group consisting of rhodium oxides, halides, nitrates, oxalates, acetates, carbamates, propionates, tartrates, hydroxides and mixtures of these.
Claim 5
Dependent Claim
20 words
The process of claim 1 in which the reducible compounds of rhodium are selected from rhodium chloride and rhodium nitrate.
Claim 6
Dependent Claim
22 words
The process of claim 1 in which the reducing agent is selected from the group consisting of hydrogen, hydrazine and sodium borohydride.
Claim 7
Dependent Claim
29 words
The process of claim 1 in which the reduction step is carried out during the hydrogenation of the at least one unsaturated dinitrile and the reducing agent is hydrogen.
Claim 8
Dependent Claim
14 words
The hydrogenation catalyst prepared by the method of claim 1, 2, 3, or 5.
Claim 9
Dependent Claim
36 words
The process of claim 1 in which the silica support is contacted prior to vacuum treatment with a material consisting essentially of a liquid solution of a substance selected from rhodium and reducible compounds of rhodium.
Claim 10
Dependent Claim
27 words
The process of claim 1 in which the silica support is contacted with a material consisting essentially of a liquid solution of rhodium chloride or rhodium nitrate.
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) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |