Process for producing aminophenols

Details Process for producing aminophenols Process for producing aminophenols

C - Chemistry, Metallurgy

07

C

260/601.5

C07C 89/00 (1985.01) C07C 91/44 (1985.01)

Patent

CA 1245672

Abstract of the Disclosure: A process for producing an aminophenol, which comprises (A) a step of reacting a dihydric phenol with an aminating reagent in the liquid state under heat in the presence of water and a water-soluble catalyst, (B) a step of removing the unreacted aminating reagent from the reaction mixture, and then precipitating the crude aminophenol from the reaction mixture from which the aminating reagent has been removed, thereby to obtain a crystallization mixture containing the crude aminophenol, (C) a step of separating the crystallization mixture into crystals of the crude aminophenol and the reaction mother liquor containing the catalyst, (D) a step of circulating part or the whole of the reaction mother liquor to the aminating step, and (E) a step of washing the crude aminophenol crystals with a washing liquor to obtain the washed crude aminophenol crystals and the washing mother liquor, and thereafter separating the aminophenol from the washed crude aminophenol crystals and purifying it.

497083

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