Process for the production of malonic acid dinitrile and purification thereof
US4105688A · kind A · utility
52Cited by
7References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 26, 1971 |
| Grant date | Aug 8, 1978 |
| Priority date | — |
| Expiry date | Apr 26, 1991 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C255/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Malonic acid dinitrile is prepared by reacting acetonitrile and cyanogen chloride in the gaseous phase at temperatures from 740.degree. to 780.degree. C. Temperatures from 750.degree. to 760.degree. C. with molar ratios of 1:1 to 1:5 of cyanogen chloride to acetonitrile are preferred. The crude mixture containing malonic acid dinitrile may be purified by conversion of the principal impurities to easily separable compounds by a Diels-Alder or selective hydrogenation reaction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.