Patent ID: 6300497
Filing Date: 2001-10-09
Classification: C07C,C07D

Abstract:
A process for distillative removal of part or all of an azepine derivative (III) selected from the group consisting of tetrahydroazepine, 2-aminoazepan, N-(2-azepano)-1,6-diaminohexane and N-(2-azepano)-6-aminocapronitrile from a mixture (II) comprising an azepine derivative (III) and an amine (I) selected from the group consisting of 6-aminocapronitrile and hexamethylenediamine, which comprises conducting the distillation with an overhead temperature of from 160 to 250.degree. C., the distillation pressure, as measured at the top of the distillation apparatus, being within the range from 0.3 to 3 bar if hexamethylenediamine is used as amine (I) and within the range from 0.1 to 1.3 bar if 6-aminocapronitrile is used as amine (I).