申请人:Shinohata Masaaki
公开号:US20110054211A1
公开(公告)日:2011-03-03
An object of the present invention is to provide a process that enables isocyanate to be produced stably over a long period of time and at high yield without encountering problems of the prior art during production of isocyanate without using phosgene. The present invention provides an isocyanate production process including the steps of: obtaining a reaction mixture containing an aryl carbamate having an aryl group originating in a diaryl carbonate, an aromatic hydroxy compound originating in a diaryl carbonate, and a diaryl carbonate, by reacting a diaryl carbonate and an amine compound in the presence of a reaction solvent in the form of an aromatic hydroxy compound; transferring the reaction mixture to a thermal decomposition reaction vessel; and obtaining isocyanate by applying the aryl carbamate to a thermal decomposition reaction, wherein the reaction vessel in which the reaction between the diaryl carbonate and the amine compound is carried out and the thermal decomposition reaction vessel for the aryl carbamate are different.
本发明的一个目的是提供一种能够在生产异氰酸酯时在长时间内稳定地且高产率地生产异氰酸酯的方法,而不使用光气时遇到先前技术问题的方法。本发明提供了一种异氰酸酯生产方法,包括以下步骤:通过在反应溶剂形式的芳香羟基化合物存在下,通过反应二芳基碳酸酯和胺化合物得到含有源自二芳基碳酸酯的芳基碳酸酯、源自二芳基碳酸酯的芳香羟基化合物和二芳基碳酸酯的反应混合物;将反应混合物转移至热分解反应容器;通过将芳基碳酸酯应用于热分解反应来获得异氰酸酯,其中进行二芳基碳酸酯和胺化合物之间的反应的反应容器和用于芳基碳酸酯的热分解反应的反应容器是不同的。