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.

介绍用光气和硝基苯胺在酯溶剂中反应来制备硝基异氰苯酯的法，并讨论了其最佳工艺条件。

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。