Patent ID: 8389770
Filing Date: 2013-03-05
Classification: C07C

Abstract:
1. A process for preparing a bis(aminophenyl)alkane, comprising reacting an aromatic amine, which may be substituted or unsubstituted, with a C 1 -C 3 aldehyde in the presence of a heterogeneous catalyst, the catalyst being a mesoporous acidic ion exchanger based on a divinylbenzene/styrene copolymer, and the catalyst comprising an acidic center, measured in accordance with DIN 54 403, in a concentration of 4 to 6 eq/kg, and the average pore diameter of the catalyst particles, measured in accordance with ASTM D 4222, being 10 to 32 nm, and the polynuclear compound content of the reaction mixture formed being 10% by weight.