Process for the production of 4,4'-diamino-dicyclohexylmethane w

Details Process for the production of 4,4'-diamino-dicyclohexylmethane w Process for the production of 4,4'-diamino-dicyclohexylmethane w

1989-09-21

1993-03-23

Ivy, C. Warren

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

C07C21135

Patent

active

051965941

ABSTRACT:
The present invention is directed to a process for the catalytic hydrogenation of a starting material containing 4,4'-diamino-diphenylmethane (4,4'-MDA) or its mixtures with 2,4'-diamino-diphenylmethane, 2,2'-diamino-diphenylmethane and/or higher ring compounds of the diphenylmethane series to a hydrogenation product having a trans-trans isomer content of 4,4'-diamino-dicyclohexylmethane (4,4'-HMDA) of about 15 to 40 weight percent, based on the diamine content of the hydrogenated product, by continuously hydrogenating in at least one fixed bed reactor at a temperature of about 100.degree. to 190.degree. C. and a pressure of about 50 to 350 bar in the presence of a ruthenium catalyst on a catalyst support having a BET surface area of about 70 to 280 m.sup.2 /g and an average pore diameter d.sub.p of about 10 to 320 .ANG., the catalyst being prepared by impregnating the catalyst support to a penetration depth of at least about 50 .mu.m with a soluble ruthenium compound in an amount sufficient to provide a catalyst containing about 0.1 to 5 weight percent ruthenium and subsequently reducing the soluble ruthenium compound to ruthenium.

REFERENCES:
patent: 2511028 (1950-06-01), Whitman
patent: 2606924 (1952-08-01), Whitman
patent: 3743677 (1973-07-01), Grossjubsjt et al.
patent: 3766272 (1973-11-01), Brake et al.
patent: 4394523 (1983-07-01), Allen

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