PREPARATION OF DIAMINES BY HYDROGENATION OF DINITRILES

摘要

Disclosed is a method for hydrogenating a dinitrile to form a diamine in the presence of liquid or supercritical ammonia, in particular the preparation of hexamethylenediamine (HMD) from adiponitrile (ADN) and of 2-methylpentamethylenediamine (MPMD) from methylglutaronitrile (MGN). Heat generated in the hydrogenation reaction is used to supply heat for distilling ammonia from a liquid comprising ammonia and diamine.