Selective hydrogenation of aliphatic dinitriles to omega-aminonitriles in ammonia with supported, finely dispersed rhodium-containing catalyst
US4601859A · kind A · utility
35Cited by
5References
25Claims
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Key dates
| Filing date | May 4, 1984 |
| Grant date | Jul 22, 1986 |
| Priority date | — |
| Expiry date | May 4, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A dinitrile is hydrogenated to an omega-aminonitrile with hydrogen with a supported highly dispersed rhodium catalyst and only ammonia present. The catalyst is prepared by hydrolyzing a rhodium(III) halide or nitrate with strong aqueous base at elevated temperatures, drying the supported rhodium hydroxide at elevated temperatures and intimately contacting with hydrogen the dried product with hydrogen at 260.degree.-360.degree. C. High conversions, selectivity to aminonitrile and long catalyst service times and catalyst recyclability are achieved in the absence of an aprotic solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.