Patent ID: 9079823
Filing Date: 2015-07-14
Classification: C07C,Y02P

Abstract:
1. A continuous process (P) for continuously preparing a diamine, the process comprising the steps of: (a) reacting a corresponding alkenenitrile and a corresponding monoamine to form a corresponding aminonitrile, the monoamine being introduced in molar excess relative to the alkenenitrile, with recycling into the reaction of the unreacted monoamine; (b) reducing the aminonitrile obtained in step (a) with hydrogen in the presence of at least one alkali metal hydroxide, water and a hydrogenation catalyst; (c) separating the at least one alkali metal hydroxide by evaporation of a diamine obtained in step (b) and of the water; and (d) distilling the diamine, wherein, said alkenenitrile is a linear or branched C2 to C4 alkene in which a hydrogen atom is replaced with a conjugated cyano group and/or the monoamine is a secondary amine of general formula R1R2NH, in which R1 and R2, which can be identical or different, represent a C1 to C4 alkyl.