Process for preparing para-phenylenediamine derivatives

Details Process for preparing para-phenylenediamine derivatives Process for preparing para-phenylenediamine derivatives

1998-06-04

1998-11-24

Burn, Brian M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

564434, C07C20936

Patent

active

058409823

ABSTRACT:
An improvement in a process for the preparation of a p-aminodiarylamine by reduction of the corresponding nitroso or nitro compound with hydrogen in a hydrogenator in the presence of a catalyst is disclosed. The invention includes equipping the hydrogenator with filtration means capable of separating the p-aminodiarylamine product from the catalyst, whereby the p-aminodiarylamine product can be removed from the hydrogenator while the catalyst is retained therein, thereby permitting the reaction to be run semicontinuously or continuously.

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