DIAMINE PURIFICATION METHOD

摘要

The invention relates to a method of purifying diamines which are obtained by hydrogenation of dinitriles. More specifically, the invention relates to the purification of hexamethylene diamine which is obtained by hydrogenation of adiponitrile. The inventive method consists in treating at least one part of the hexamethylene diamine flow drawn from the distillation column and re-injecting the treated flow back into the column.