The article is about how to use phosgene and p-nitrophenylamine to react in acetic ether's liquefier to produce p-nitro-phenyl isocyanate, Its best technological condition have been discussed.

介绍用光气和苯胺在乙酸乙酯溶剂中反应来制备异氰酸苯酯的方法，并讨论了其最佳件。

Analysis on leakage reasons of chlorine liquefier were anlysed from manufacture, test and application. The liquefier was failure, and the protective measures were put forward.

从制造、检验、使用等方面氯气液化器的泄漏、失效原因进行了详细分析,针失效原因提出了防护措施。