Patent ID: 6278023
Filing Date: 2001-08-21
Classification: B01J,C07C

Abstract:
A process for preparing aliphatic alpha, omega-diamines by hydrogenation of aliphatic alpha, omega-dinitriles in the presence of a catalyst, which comprises using a hydrogenation catalyst comprising(a) iron or a compound based on iron or mixtures thereof,(b) from 0.001 to 0.3% by weight based on (a) of a promoter based on 2, 3, 4 or 5 elements selected from the group consisting of aluminum, silicon, zirconium, titanium and vanadium, and also(c) from 0 to 0.3% by weight based on (a) of a compound based on an alkali and/or alkaline earth metal,the aliphatic alpha, omega-diamine comprising less than 2000 ppm of alpha, omega-aminonitrile based on diamine.