PROCEDIMIENTO CONTINUO PARA LA PREPARACION DE ISOCIANATOS ORGANICOS

摘要

A two-stage continuous preparation process for organic isocyanates uses a primary amine which is reacted with stoichiometrically excess phosgene at a gauge pressure of 10 Kg/cm2 or lower and a temperature of 60 DEG -100 DEG C. in an inert organic solvent. Then, the resultant reaction mixture is maintained at a gauge pressure of 10 Kg/cm2or lower and a temperature of 120 DEG -160 DEG C. until the reaction is completed.