Process for the preparation of chlorine-substituted aromatic amines and of catalysts

US5410085A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Udo Birkenstock · Ratingen, DE
• Walter Kipshagen · Leverkusen, DE
• Herbert Schmidt · Friedberg, DE
• Thomas Schulz · Bad Pyrmont, DE
• Eberhard Zirngiebl

Key dates

• Filing date: Oct 20, 1993
• Grant date: Apr 25, 1995
• Expiry date: Oct 20, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C209/365
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Chlorine-substituted aromatic amines are prepared by the hydrogenation of chlorine-substituted aromatic nitro compounds in the presence of a catalyst containing platinum and nickel and/or cobalt on an activated charcoal support, the platinum having been simultaneously deposited and reduced on the activated charcoal support in the preparation of the catalyst. Such catalysts are furthermore prepared, as are catalysts containing noble metals on an activated charcoal support, it also being possible for the latter to be used for the reduction of nitronaphthalenes or nitrotoluenes.