Process for preparing p-aminophenol in the presence of dimethyld

Details Process for preparing p-aminophenol in the presence of dimethyld Process for preparing p-aminophenol in the presence of dimethyld

1978-10-27

1979-11-27

Douglas, Winston A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 8900

Patent

active

041761383

ABSTRACT:
The preparation of p-aminophenol by the catalytic hydrogenation of nitrobenzene in an acid reaction medium containing an aqueous isopropyl alcohol solution of trimethyldodecylammonium chloride leads to the formation of chloro- and isopropoxyaniline impurities. These end up in the by-product aniline. The substitution of dimethyldodecylamine sulfate for the quaternary salt eliminates these impurities without significant adverse effect on the yield, production rate or purity of the p-aminophenol.

REFERENCES:
patent: 2198249 (1940-04-01), Henke et al.
patent: 2765342 (1956-10-01), Spiegler
patent: 3383416 (1968-05-01), Benner
patent: 3535382 (1970-10-01), Brown et al.
patent: 3654365 (1972-04-01), Daunis et al.
Bamberger, "Deutsche Chemische Gesellschaft Berichte", 27, pp. 1347-1350 (1894).
Bamberger, "Deutsche Chemische Gesellschaft Berichte", 27, pp. 1548-1557 (1894).

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