Method for producing aromatic amines

摘要

The invention relates to a process for preparing aromatic amines by catalytically hydrogenating the corresponding aromatic nitro compound, which comprises using a copper catalyst with a support comprising SiO2, the SiO2 having been prepared by wet grinding and subsequent spray drying.

主权项

1. A process for preparing an aromatic amine, comprising:
hydrogenating, with a copper catalyst, a corresponding aromatic nitro compound, wherein: the copper catalyst comprises a support comprising SiO2 obtained by wet grinding and subsequent spray drying, the copper catalyst additionally comprises potassium and zinc, the copper catalyst has a surface area of from 150 to 380 m2/g, the SiO2 has a surface area of from 400 to 620 m2/g, the hydrogenating is performed at a pressure of 2 to 20 bar and a temperature of 200 to 300° C., the catalyst comprises copper in an amount of 15 to 40% by weight, and the sum of the potassium and zinc and any additional metals present in the copper catalyst is 1 to 10% by weight.