| abstract |
The invention relates to a process for the preparation of m-toluenediamine, wherein a) hydrogenating dinitrotoluene in the presence of a catalyst and separating the resulting reaction mixture from catalyst, water and optionally solvent to give crude toluenediamine, and b) the crude toluenediamine is separated by distillation in a dividing wall column, wherein at least four product streams P1 - P4 are obtained, wherein the product stream P1 is a low boiler-containing stream, and the product stream P2 is an o-toluenediamine-containing stream, and the product stream P3 is a stream containing m-toluenediamine, and the product stream P4 is a high boiler and m-toluenediamine-containing stream. |