Procedure for aincrementar the selectivity of the hydrogenation of 4,4'-diaminodiphenylmethane 4,4'-diaminodicyclohexylmethane in the presence of n-alkyl-4,4'-diaminodiphenylmethane.

摘要

Process for the production of 4-diaminodicyclohexylmethane 4¿ (4 4¿-HMDA) by catalytic hydrogenation of a mixture of substances containing 4-diaminodiphenylmethane 4¿ (4 4¿-MDA) as the main component and its derivative mono-N-methyl as a secondary component, provided with an increased with respect to the hydrogenation of 4, 4¿-MDA in the presence of a heterogeneous hydrogenation catalyst at a temperature in the range of 50 to 220 ° C selectivity, and pressure hydrogen in the range of 1 to 30 MPa, characterized in that the