A method for the production of toluylene diisocyanate, special mixtures of toluene diamine and water and their use for the preparation of toluylene diisocyanate

摘要

toluylendiisocyanat nitration of toluene to be dinitrotoluol, hydrogenation of the dinitrotoluols, possibly in the presence of a solvent or diluent, to a rohlu00f6sung from toluylendiamin and reaktionswasser,reappraisal of the toluylendiamin - rohlu00f6sung to dry toluylendiamin of commercial quality and phosgenierung of toluylendiamins to toluylendiisocyanat produced, with the destillative reappraisal of the toluylendiamin - rohlu00f6sung to anhydrous toluylendiamin,if necessary, after complete or partial resolution of separation of the solvent or diluent in a first manufacturing facility with a water content of 1 to 40 wt.%, preferably 2 to 10% by weight.-% is interrupted, the resulting mixture in liquid form to another plant is transported, where the destillative drying of the toluylendiamins is completed, where appropriate, further aufarbeitungsstufen be connected and then the toluylendiamin in to fa nder way to toluylendiisocyanat phosgeniert.the invention concerns also a $toluylendiamin and mixtures of water with a point of maximum 95u00b0c and their use for the production of toluylendiisocyanat, preferably in a place, the place of manufacture of mixtures of water and toluylendiamin differences hiedlich.