2．1．1光气法（Phosgene method） 光气法是以苯酚（Phenol，PhOH）禾I］光气（COCl2）为原料来合成碳酸二苯酯，反应方程式如下： 2白OH+COCl2口。
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The invention relates to a method for producing isocyanates by reacting the corresponding amines with phosgene, optionally in the presence of at least one inert medium, in the gas phase.
本发明涉及一种在气相中，任选在至少一种惰性介质存在下，使相应的胺与光气反应而生产异氰酸酯的方法。
The method uses the bi-(trichloromethyl methyl) carbonate to replace phosgene so as to greatly reduce the safety and environmental protection risks from the source;
该方法用双（三 氯甲基）碳酸酯替代光气，从源头上大大降低了安全和环保隐患；
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