PRODUCTION OF M-AMINOPHENOL
    4.
    发明专利

    公开(公告)号:CA1329626C

    公开(公告)日:1994-05-17

    申请号:CA585294

    申请日:1988-12-08

    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 byproducts 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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