Verfahren zur Herstellung von Parachlorphenylisozyanat

摘要

Phenyl isocyanate is produced by reacting aniline with phosgene in a single stage at a temperature of 90-95 DEG C., by simultaneously feeding into a reactor phosgene and a solution of aniline in toluene, the molar ratio of aniline to toluene being 1:2 and the molar ratio of phosgene to aniline being 1.05, and degassing the product by treating it in counterflow with an inert gas at the above-mentioned temperature. The process may be carried out in a reactor connected through a side overflow with a degassing column which is filled with glass rings and is provided with a thermometer, a cooler and an inert gas bubbling tube.