FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention relates to the improved method for preparing N-alkyl-N'-phenyl-p-phenylenediamines. Method involves interaction of aminodiphenylamine with aliphatic alcohols at temperature 170-235°C in the presence of potassium hydroxide by azeotrope distillation off and the following condensation of formed water and alcohol vapors in heat exchanger device, separation of water from alcohol in water separator device and recovery settled alcohol to the parent reaction mass through tubular film vaporizer heated by a heat carrier with temperature 175°C, not below. Method provides diminishing the reaction time and losses of alcohol, and to reduce energy consumption in the process due to decreasing temperature.
EFFECT: improved preparing method.
5 ex
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