| 摘要 |
<p>CATALYTIC HYDROGENATION OF DI(4-AMINOPHENYL)METHANE The present invention relates to an improved process 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 rutheniumon-alumina catalyst, the use of an aliphatic alcohol during hydrogenation and the use of ammonia during hydrogenation, 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.degree.C and at a hydrogen pressure of at least 500 psi.</p> |
