Hemihydrogenation method for dinitriles
US6521779B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 2001 |
| Grant date | Feb 18, 2003 |
| Priority date | — |
| Expiry date | Sep 25, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D223/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention concerns the hydrogenation in amine function of a nitrile function of a dinitrile to obtain the corresponding aminonitrile. More precisely, the invention concerns the hemihydrogenation of a dinitrile into the corresponding aminonitrile, in a liquid medium, characterized in that it consists in operating in the presence of a Raney nickel or cobalt catalyst containing copper and/or silver and/or gold and in the presence of an alkaline or alkaline-earth metal hydroxide. The hemihydrogenation of adiponitrile provides amino-6 capronitrile, compound which can be easily transformed by cyclization hydrolysis into caprolactam, the starting product for the synthesis of polyamide-6.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.