Patent ID: 6972075

Claim:
A process for the distillative separation of 6-aminocapronitrile from a raw mixture containing 6-aminocapronitrile, adipodinitrile and hexamethylenediamine, wherein a) the raw mixture is separated into a hexamethylenediamine fraction and a mixture (I) which comprises 6-aminocapronitrile and adipodinitrile and has a hexamethylenediamine content of less than 1% by weight; b) all or part of the 6-aminocapronitrile is separated from the mixture (I) to give an adipodinitrile fraction and a mixture (II) which comprises 6-aminocapronitrile and which contains less than 1% by weight of substances which boil above 6-aminocapronitrile under distillation conditions and which cannot be formed by dimerization reactions of 6-aminocapronitrile under thermal stress; and c) the mixture (II) is separated into a mixture (IV) which has a higher hexamethylenediamine content than the mixture (II), and 6-aminocapronitrile (mixture (V)) which has a lower hexamethylenediamine content than the mixture (II).