METHOD OF PRODUCING N-2-ETHYLHEXYL-N'-PHENYL-p-PHENYLENEDIAMINE Russian patent published in 2011 - IPC C07C211/51 C07C211/55 C07C209/16 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing N-2-ethylhexyl-N'-phenyl-n-phenylenediamine. The method is realised through alkylation of n-aminophenyl-amine with a potassium alcoholate solution in 2-ethylhexanol, added continuously in equal portions into molten n-aminophenyl-amine. Alcohol azeotrope is distilled with water through a fractionating column in which temperature is kept at 90-110°C by returning the condensed hot alcohol into the reaction zone. The end product is separated from the organic layer after aqueous extraction of the reaction mass. Temperature of the added potassium alcoholate solution is kept at 135-160°C. Before adding the potassium alcoholate solution, molten n-aminophenyl-amine is heated to 200-209°C, and addition is carried out until achieving 95% conversion of n-aminophenyl-amine, after which temperature in the reactor is raised to 231-237°C in order to complete alkylation.

EFFECT: short duration of the alkylation step, low power consumption during alkylation, low specific consumption of 2-ethylhexanol, high quality of the product.

4 cl, 1 tbl, 6 ex