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US4224248A
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Process for the depyrophorization of pyrophoric metal catalysts and uses thereof
Assignee: Bayer AG
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Filing: 1978-10-17
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Granted: 1980-09-23
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Expires: 1998-10-17
Abstract
Abstract A process has been developed for the depyrophorization of pyrophoric metal catalysts, such as Raney nickel catalysts, which comprises treating said pyrophoric metal catalysts in water and/or an organic solvent with an organic nitro compound or a nitroso compound. The catalysts which are obtained according to the process of the invention are useful for carrying out all hydrogenation reaction which can be carried out using the corresponding pyrophoric catalysts. The catalysts obtained are further distinguished by high activity and extended life. They are not contaminated by contact catalyst poisons and can be used essentially without pre-activation.
Inventors
- 👤 Udo Birkenstock
- 👤 Josef Haydn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:49
CPC Classifications
B; B01; B01J; B01J25/00; B01J25/02; B01J33/00; B01J27/00; B01J27/02; B01J27/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
72 words
A process for the hydrogenation of an organic compound which comprises contacting said organic compound with a non-pyrophoric, highly active metal catalyst requiring essentially no pre-activation, and, prepared from a pyrophoric metal catalyst by treating a suspension of the pyrophoric metal catalyst in water and/or an organic solvent with an organic nitro compound or a nitroso compound at elevated temperature and pressure and separating the hydrogenated organic compound from the reaction medium.
Claim 2
Dependent Claim
72 words
A process for the hydrogenation of an organic compound which comprises contacting said organic compound with a non-pyrophoric, highly active metal catalyst requiring essentially no pre-activation, and, prepared from a pyrophoric metal catalyst by treating a suspension of the pyrophoric metal catalyst in water and/or an organic solvent with an organic nitro compound or a nitroso compound at elevated temperature and pressure and separating the hydrogenated organic compound from the reaction medium.
Claim 3
Dependent Claim
66 words
A process of claim 1 wherein the catalyst is prepared from a pyrophoric metal catalyst by treating a suspension of a pyrophoric metal catalyst, which contains, as the metal, an element of the groups IIa, IIIb, IVa, IVb, Vb, VIb, VIIb, VIII and Ib of the periodic System according to Mendeleev, in water and/or an organic solvent with an organic nitro compound or a nitroso compound.
Claim 4
Dependent Claim
43 words
A process of claim 1 wherein the catalyst is prepared from a pyrophoric metal catalyst by treating the suspension of a pyrophoric Raney nickel or Raney nickel/iron catalyst in water and/or an organic solvent with an organic nitro compound or a nitroso compound.
Claim 5
Dependent Claim
19 words
A process of claim 1, wherein the organic compound to be hydrogenated is an aromatic nitro or nitroso compound.
Claim 6
Dependent Claim
15 words
A process of claim 1, wherein the organic compound to be hydrogenated is a nitrile.
Claim 7
Dependent Claim
16 words
A process of claim 1, wherein the organic compound to be hydrogenated is a 2,4/2,6-dinitrotoluene mixture.
References Cited (Backward Citations)
US3425959A
Cited
US3544485A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |