Patent ID: 8884064
Filing Date: 2014-11-11
Classification: C07C

Abstract:
1. A process comprising: (A) hydrogenating adiponitrile to hexamethylene diamine in the presence of at least one heterogeneous catalyst in a reaction mixture, wherein the at least one heterogeneous catalyst comprises a metal selected from the group consisting of Ni, Fe, Co, and mixtures thereof, and wherein the at least one heterogeneous catalyst has a particle size distribution of 0.1 to 5000 μm, and (B) removing the at least one heterogeneous catalyst by means of a magnetic filter or a wet drum separator, wherein the magnetic filter is a back flushable magnetic filter and the content of the at least one heterogeneous catalyst in the reaction mixture which is used in step (B) is from 5 to 10,000 ppm by weight based on the reaction mixture; wherein at least part of the at least one heterogeneous catalyst is separated off after step (A) and before step (B), and wherein the removal before step (B) is carried out by filtration, by cross flow filtration, by separation in the earth's gravitational field, by sieving, or a combination thereof.