FIELD: chemistry.
SUBSTANCE: according to the disclosed method, a) dinitrotoluene undergoes hydrogenation in the presence of a catalyst and the obtained reaction mixture is separated from the catalyst, water and optionally solvent to obtain crude toluylenediamine, and b) crude toluylene undergoes distillation separation in a column with a partition in the middle part of the column, having a condenser, an evaporator and separating segments, to obtain at least four product streams P1-P4, wherein stream P1 contains low-boiling products, stream P2 contains o-toluylenediamine, stream P3 contains m-toluylenediamine, streap P4 contains high-boiling products and m-toluylenediamine.
EFFECT: method enables easy and efficient extraction of m-toluylenediamine from crude toluylenediamine obtained through hydrogenation of dintritoluene.
11 cl, 5 dwg, 1 ex
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