| 摘要 |
Aliphatic dinitriles containing from 4 to 22 carbon atoms and having at least two carbon atoms between the nitrile groups are purified by heating with water and a neutral salt of ammonia or an amine. A suitable temperature range is 50 DEG to 200 DEG C. The water is preferably present in an amount which is 1 to 20% by weight of the dinitrile, and the neutral salt is preferably present in an amount which is 0.01 to 10% by weight of the dinitrile. Dinitriles exemplified are adipodinitrile, suberodinitrile, sebacodinitrile and mixtures of 1,9- and 1,10-dicyanoheptadecanes. After heating, the mixture of dinitrile, neutral salt and water may be subjected to distillation. The process may be adapted to both continuous and discontinuous operation. |
