Alkylation of toluenediamine and para-phenylenediamine with isobutylene in the presence of acidic, crystalline molecular sieves

摘要

This invention relates to an improvement in a fixed bed process for producing tert-butyl-derivatives of aromatic amines, e.g., para-phenylenediamine and toluenediamine by the reaction of isobutylene with the corresponding aromatic diamine in the presence of a highly acidic crystalline alumino-silicate catalyst. The improvement for regenerating the catalyst during operation constitutes adding sufficient water to the catalyst to provide sufficient saturation of the catalyst during the reaction and generally retard the reaction and then substantially decreasing the quantity of added water or reducing the amount of water added.