Hydrogenation of methylenedianiline to produce bis(para-aminocyc

Details Hydrogenation of methylenedianiline to produce bis(para-aminocyc Hydrogenation of methylenedianiline to produce bis(para-aminocyc

1988-02-10

1990-08-07

Hollrah, Glennon H.

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

Organic compounds

Amino nitrogen containing

564452, C07C20972

Patent

active

049469983

ABSTRACT:
This invention relates to an improved hydrogenation process wherein methylenedianiline is reduced to form bis(para-aminocyclohexyl)methane (PACM). The process contemplates contacting methylenedianiline and hydrogen in the presence of a two component metal catalyst comprising rhodium and ruthenium under mild hydrogenation conditions. Use of the mixed metal catalyst system allows one to obtain a preselected isomer ratio having from about 5-40% by weight, typically 14`28% by weight of the trans,trans- configurational isomer.

REFERENCES:
patent: 3697449 (1972-10-01), Brake
patent: 3856862 (1974-12-01), Chung et al.
patent: 4448995 (1984-05-01), Allen
patent: 4754070 (1988-06-01), Casey et al.

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