Process for the preparation of toluene diisocyanate

Preparing tolylene diisocyanate comprises reacting toluene diamine with phosgene to give a raw tolylene diisocyanate, distillatively purifying the raw tolylene diisocyanate to give pure tolylene diisocyanate and a mixture containing tolylene diisocyanate and a distillation residue, mixing the mixture containing tolylene diisocyanate and the distillation residue with water at less than 230[deg] C and less than 30 bars in one or more consecutively arranged raw reactor to give toluene diamine, and purifying the obtained toluene diamine and reintroducing to the reaction in the first step. Preparing tolylene diisocyanate comprises reacting toluene diamine with phosgene to give a raw tolylene diisocyanate, subsequently distillatively purifying the raw tolylene diisocyanate to give pure tolylene diisocyanate and a mixture containing tolylene diisocyanate and a distillation residue, continuously mixing the mixture containing tolylene diisocyanate and the distillation residue with water at less than 230[deg] C and an absolute pressure of less than 30 bars in one or more consecutively arranged raw reactor to give toluene diamine, and purifying the obtained toluene diamine and reintroducing to the reaction in the first step.