METHOD OF OBTAINING AROMATIC ISOCYANATES

摘要

In the production of an aromatic organic isocyanate by contacting an aromatic nitro compound and carbon monoxide in the presence of a catalyst system comprising a platinum group metal compound with or without an aromatic nitrogenous heterocyclic compound, an improved process wherein the said catalyst system includes further at least one of water, hydrogen, hydrogen halides, boric acids, formic acid, oxalic acid and formaldehyde. By such improved process a much higher reaction rate and a markedly excellent yield are attained.