Process for increasing the selectivity of the hydrogenation...

Details Process for increasing the selectivity of the hydrogenation... Process for increasing the selectivity of the hydrogenation...

C - Chemistry, Metallurgy

07

C

C07C 209/72 (2006.01) C07C 211/36 (2006.01)

Patent

CA 2492095

The invention relates to a process for increasing the selectivity of the hydrogenation of 4,4'-diaminodiphenylmethane (4,4'-MDA) to diaminodicyclohexylmethane (4,4'-HMDA) by catalytic hydrogenation of a mixture containing 4,4'-MDA as the main component and its mono-N-methyl derivative as a secondary component. According to the invention, the hydrogenation is terminated before a conversion of 4,4'-MDA to 4,4'-HMDA of 99% is achieved. Under these conditions, a substantially smaller proportion of the N-methyl- 4,4'-MDA is hydrogenated to N-methyl-4,4-HMDA.

L'invention concerne un procédé d'augmentation de la sélectivité de l'hydrogénation de 4,4'-diaminodiphénylméthane (4,4'-MDA) en diaminodicyclohexylméthane (4,4'-HMDA) par hydrogénation catalytique d'un mélange contenant 4,4'-MDA comme composant principal et son dérivé de mono-N-méthyl comme composant secondaire. Selon l'invention, l'hydrogénation s'achève avant la conversion à 99 % de 4,4'-MDA en 4,4'-HMDA. Dans ces conditions, une proportion sensiblement inférieure du N-méthyl-4,4'-MDA est hydrogénée en N-méthyl-4,4-HMDA.

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