Process for the preparation of mixed isomeric methylene-bridged

Details Process for the preparation of mixed isomeric methylene-bridged Process for the preparation of mixed isomeric methylene-bridged

1974-05-30

1976-05-25

Horwitz, D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 8740

Patent

active

039593746

ABSTRACT:
A process is described for the preparation of mixed isomeric methylene-bridged polycyclohexylpolyamines wherein a mixed isomeric methylene-bridged polyphenyl polyamine mixture having a functionality of from about 2.0 to about 3.3 is pretreated by contacting the mixture and hydrogen with a nickel-containing hydrogenation catalyst at a temperature of from about 25.degree.C. to about 250.degree.C. under a pressure of about 500 to about 15,000 psig. The pretreated isomeric polyamine is then hydrogenated in the presence of ammonia under conventional hydrogenation conditions employing a ruthenium-containing hydrogenation catalyst. The pretreatment step allows the utilization of mixed isomeric methylene-bridged polyphenyl polyamine feed mixtures for the production of isomeric methylene-bridged polycyclohexylpolyamines in high yields without attendant deactivation of the ruthenium hydrogenation catalyst heretofore observed. The process is particularly applicable to continuous operation.

REFERENCES:
patent: 3376341 (1968-04-01), Bauer

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