Bayer Aktiengesellschaft

Walter Kipshagen

Alexander Klausener

Heinz U Blank

Eberhard Zirngiebl

Heinz Landscheidt

Udo Birkenstock

Herbert Schmidt

Thomas-Jorn Schulz

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.

Process for the preparation of chlorine-substituted aromatic amines and

Dialkyl carbonates can be prepared by reacting carbon monoxide with alkyl nitrites over a modified platinum metal supported catalyst at an elevated temperature in a continuous gas phase reaction, the reaction being carried out with the exclusion of additional oxidizing substances and, if appropriate, the presence of a lower alcohol.

Process for the preparation of dialkyl carbonates

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Leverkusen, Germany

Walter Kipshagen