Para-aminophenol derivatives

Details Para-aminophenol derivatives Para-aminophenol derivatives

1978-11-08

1981-03-17

Howard, Jacqueline V.

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

Organic compounds

Amino nitrogen containing

564435, C07C 8758, C07C 9144

Patent

active

042566690

ABSTRACT:
A process for the preparation of diaryl para-phenylenediamines from a crude para-aminophenol solution such as obtained by the 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 consisting of aniline, mixed toluidines, 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 separated 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-phenylenediamines.

REFERENCES:
patent: 2048823 (1936-07-01), Semon
patent: 2053785 (1936-09-01), Semon
patent: 2087199 (1937-07-01), Clifford
patent: 3383416 (1968-05-01), Benner
patent: 3418373 (1968-12-01), Summers et al.
patent: 3432460 (1969-03-01), Spacht
patent: 3717680 (1973-02-01), Baron et al.

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