Continuous Ni/low A1 catalyzed hydrogenation of aromatic nitro compounds
US6423872B1 · kind B1 · utility
15Cited by
1References
22Claims
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Key dates
| Filing date | Mar 28, 2001 |
| Grant date | Jul 23, 2002 |
| Priority date | — |
| Expiry date | Mar 28, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C209/36
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Nitrated aromatic compounds are continuously catalytically hydrogenated into their corresponding aromatic amines in the presence of an effective amount of a nickel or nickel/aluminum catalyst, the nickel catalyst being essentially devoid of aluminum values and the nickel/aluminum catalyst containing up to 5.5% by weight of aluminum values; the subject hydrogenation is thus conducted under conditions such as to limit the formation of nickel aluminates and the nickel or nickel/aluminum catalyst is continuously catalytically active for at least three days.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.