Patent ID: 6936737
Filing Date: 2005-08-30
Classification: C07C

Abstract:
1. A process for the preparation of methane diphenyl diamine or a mixture of methane diphenyl diamine and its higher homologues having the general formula (I): where R is independently selected from hydrogen, a C1 to C8 alkyl group, a C4 to C10 cycloalkyl group and a C6 to C12 aromatic group and n is a whole number from 1 to 5 so as to give a functionality from 2 and 6, which comprises carrying out the re-arrangement reaction of the intermediate having general formula (II): in the presence of a zeolite in acid form with a “spaciousness index” from 2.5 to 19 modified on the surface by one or more organic silicon compounds having the general formula Si(OX)4 or SiX4, in which X represents independently a C1 to C20 alkyl group, a C4 to C20 cycloalkyl group, or a C6 to C20 aromatic or alkyl-aromatic group, optionally substituted with one or more halogen atoms which zeolite has been calcined.