Patent ID: 9102594
Filing Date: 2015-08-11
Classification: C07C

Abstract:
1. Process for the preparation of isocyanates by reaction of the corresponding amines with phosgene in the gas phase, wherein (i) the amine is converted into the gas phase in a vaporization space in the presence of from >0.10% by weight to 10% by weight of a diluent, based on the total weight of diluent and amine; (ii) the gaseous stream obtained from (i) containing amine and diluent is reacted with a gaseous phosgene stream in a reaction space to give the corresponding isocyanate; characterized in that the diluent employed in step (i) contains between 90.0000% by weight and 99.9950% by weight of substances which are inert in the phosgenation process and between 0.68% by weight and 10.0000% by weight of oxygen, in each case based on the weight of the diluent, and the molar ratio of amine to oxygen (O wherein the amine is toluene diamine (TDA).