Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Patent
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:
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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.
Benner Roland G.
Henson Paul D.
Howard Jacqueline V.
Mallinckrodt Inc.
Rosen Lawrence
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