Para-aminophenol derivatives

Details Para-aminophenol derivatives Para-aminophenol derivatives

C - Chemistry, Metallurgy

07

C

260/612.3, 260/5

C07C 213/10 (2006.01)

Patent

CA 1124262

ABSTRACT OF THE DISCLOSURE A process for the preparation of diaryl para-phenylene- diamines from a crude para-aminophenol solution such as obtained by tho catalytic hydrogenation of nitrobenzene in an aqueous acid reaction medium. The process comprises contacting the para-aminophenol containing acidic solution, after neutralization with ammonia, with an aromatic amine selected from the group conststing of aniline, mixed toluidanes, ortho-toluidine, mixed xylidines, and mixtures thereof under conditions whereby the aromatic amine extracts the para-aminophenol from the crude feed solution and is separated therefrom. The geparated solution comprised essentially of the aromatic amine extractant, para-aminophenol, and minor amounts of impurities is then contacted with an alkylation catalyst to produce the diaryl para-phenylene- diamines.

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