Process for the production of malononitrile
US6353126B1 · kind B1 · utility
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13Claims
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Key dates
| Filing date | Jun 30, 1999 |
| Grant date | Mar 5, 2002 |
| Priority date | — |
| Expiry date | Jun 30, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C253/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An improved process for the commercial production of malononitrile by the dehydration of cyanoacetamide employs cyanuric chloride in the presence of a catalytic amount of N,N-dimethylformamide and in a polar solvent that is removed by vacuum distillation at a temperature below 100° C. The N,N-dimethylformamide is added in a molar ratio of 0.16 moles for each mole of cyanoacetamide present in the starting solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.