申请人:ASAHI KASEI KABUSHIKI KAISHA
公开号:US10968168B2
公开(公告)日:2021-04-06
An isocyanate production method according to the present invention is a method in which an isocyanate is produced by subjecting a carbamate to thermal decomposition, and includes: a step of preparing a mixture liquid containing the carbamate, an inactive solvent and a polyisocyanate compound; a step of conducting a thermal decomposition reaction of the carbamate by continuously introducing the mixture liquid into a thermal decomposition reactor; a step of collecting a low-boiling decomposition product by continuously extracting the low-boiling decomposition product in a gaseous state from the reactor, the low-boiling decomposition product having a boiling point lower than the polyisocyanate compound; and a step of collecting a high-boiling component by continuously extracting, from the reactor, a liquid phase component which is not collected in a gaseous state at the step of collecting the low-boiling decomposition product.
根据本发明的异氰酸酯生产方法,是一种通过使氨基甲酸酯进行热分解来生产异氰酸酯的方法,其中包括第一步:制备含有氨基甲酸酯、非活性溶剂和多异氰酸酯化合物的混合液; 第二步:将混合液连续引入热分解反应器,进行氨基甲酸酯的热分解反应;收集低沸点分解产物的步骤,从反应器中连续提取气态的低沸点分解产物,低沸点分解产物的沸点低于多异氰酸酯化合物;以及 收集高沸点组分的步骤,从反应器中连续提取在收集低沸点分解产物步骤中未收集到的气态液相组分。