Patent ID: 7115537
Filing Date: 2006-10-03
Classification: B01J,C07C,Y02P

Abstract:
1. A process for the regeneration of a zeolitic catalyst which is at least partially exhausted by use in the synthesis of optionally sudstituted methylenedianiline (MDA) and derivatives thereof or of a mixture of optionally substituted MDA and derivatives thereof with a higher homologous product, which comprises contacting said catalyst with an aromatic compound, in at least partially liquid phase wherein the aromatic compound comprises at least one substituent having activating characteristics with respect to electrophilic substitution as compared to the aromatic compound without the said substituent wherein the substituent having activating characteristics is selected from NH 2 , —NHR, —NR 2 , —OH, —O − , —OR 1 , or —NHCOR 2 substituents wherein R is hydrogen, a C 1 –C 8 alkyl, C 4 –C 10 cycloalkyl C 6 –C 12 aromatic radical. R 1 and R 2 represent a C 1 –C 4 (iso)alkyl, C 4 –C 10 cycloalkyl, aromatic, alkylaromatic or C 6 –C 10 arylakyl radical.