Catalytic hydrogenation of di(4-aminophenyl)methane

Details Catalytic hydrogenation of di(4-aminophenyl)methane Catalytic hydrogenation of di(4-aminophenyl)methane

B - Operations, Transporting

01

J

260/605.7

B01J 23/46 (2006.01)

Patent

CA 1190565

CATALYTIC HYDROGENATION OF DI(4-AMINOPHENYL)METHANE ABSTRACT OF THE DISCLOSURE The present invention relates to an improved proc- ess for the catalytic hydrogenation of di(4-aminophenyl) methane to a liquid di(4-aminocyelohexyl) methane mixture containing from 15 to 40% by weight of the trans, trans isomer. The invention resides in the use of a ruthenium- on-alumina catalyst, the use of an aliphatic alcohol during hydrogenation and the use of ammonia during hydro- genation, with the hydrogenation being conducted under specific process conditions. The hydrogenation reaction is conducted for no more than about sixty minutes at a temperature of from 150 to 217°C and at a hydrogen pres- sure of at least 500 psi.

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