A process for preparing tolylene diamines by catalytic hydrogenation of dinitrotoluene

The invention relates to a process for the preparation of toluenediamine is reacted with the dinitrotoluene with hydrogen in the presence of a catalyst, characterized in that the dinitrotoluene used based a content of carbon dioxide in physically dissolved or chemically bound form of less than 0.175 mol .-%, on the molar amount used of the dinitrotoluene, comprising.