C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/605.7
C07C 209/72 (2006.01) C07C 211/36 (2006.01) B01J 23/46 (2006.01)
Patent
CA 1331200
PROCESS FOR THE PRODUCTION OF 4,4'-DIAMINO-DICYCLOHEXYLMETHANE WITH A LOW OF TRANS-TRANS ISOMER CONTENT BY THE CATALYTIC HYDROGENATION OF 4 4'-DIAMINO-DIPHENYLMETHANE ABSTRACT OF THE DISCLOSURE 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 to 190°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 m2/g and an average pore diameter dp of about 10 to 320 .ANG., the catalyst being prepared by impregnating the catalyst support to a penetration depth of at least about 50 µm 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.
587691
Allen Gary F.
Bub Guenther Karl Heinz
Otte Werner
Schmelzer Hans Georg
Allen Gary F.
Bub Guenther Karl Heinz
Huls Aktiengesellschaft
Miles Inc.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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