Production of m-aminophenol

Details Production of m-aminophenol Production of m-aminophenol

C - Chemistry, Metallurgy

07

C

260/612.3, 260/6

C07C 213/10 (2006.01) C07C 215/74 (2006.01)

Patent

CA 1329626

ABSTRACT Disclosed is a method of purifying an aqueous solution of m-aminophenol containing m-phenylenediamine as impurities, by extracting m-phenylenediamine from the aqueous solution with a halogenated hydrocarbon. Also disclosed is an improvement in a process of producing m-aminophenol comprising: reacting resorcinol with ammonia in water in the presence of a water soluble amination catalyst at elevated temperatures in a reaction vessel, and then separating m-aminophenol from the resultant reaction mixture. The improved process employes the above-mentioned purification method and comprises: (a) a step of removing unreacted ammonia from the reaction mixture and then crystallizing crude m-aminophenol from the reaction mixture; (b) a step of separating the crude m-aminophenol from the reaction mixture; (c) a step of adding a halogenated hydrocarbon to the resulting mother liquor to extract m-phenylenediamine as by- products into the halogenated hydrocarbon, separating an aqueous phase from an organic phase, and recycling the aqueous phase to the reaction vessel; and (d) a step of distilling the crude m-aminophenol to provide high purity m-aminophenol.

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