Sequential distillation process for removing tetrahydroazepine from aminocapronitrile and/or hexamethylenediamine

摘要

A process for removing tetrahydroazepine from aminocapronitrile or hexamethylenediamine by sequential distillation in which the overhead from the second distillation is combined with a fresh, incoming mixture of tetrahydroazepine and aminocapronitrile or hexamethylenediamine.