申请人:Asahi Kasei Chemicals Corporation
公开号:EP1961731A1
公开(公告)日:2008-08-27
It is an object of the present invention to provide a specific process that enables a high-purity diaryl carbonate required for producing a high-quality high-performance aromatic polycarbonate to be produced industrially in a large amount (e.g. not less than 1 ton / hr) stably for a prolonged period of time (e.g. not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours) from a cyclic carbonate and an aromatic monohydroxy compound. When producing a high-purity diaryl carbonate from a cyclic carbonate and an aromatic monohydroxy compound, the above object can be attained by carrying out a process of the present invention which comprises the steps of: (I) producing a dialkyl carbonate and a diol using a reactive distillation column having a specified structure; (II) producing a diaryl carbonate using two reactive distillation columns each having a specified structure; and (III) purifying the diaryl carbonate so as to obtain a high-purity diaryl carbonate.
本发明的目的是提供一种特定工艺,使得可以在工业上大量稳定地生产所需用于生产高质量高性能芳香族聚碳酸酯的高纯度二芳基碳酸酯(例如,每小时不少于1吨),并且可以在较长时间内(例如,不少于1000小时,最好不少于3000小时,更好不少于5000小时)从环状碳酸酯和芳香族单羟基化合物中生产。当从环状碳酸酯和芳香族单羟基化合物生产高纯度二芳基碳酸酯时,可以通过执行本发明的工艺步骤来实现上述目的,该工艺步骤包括:(I)使用具有特定结构的反应精馏塔生产二烷基碳酸酯和二醇;(II)使用具有特定结构的两个反应精馏塔生产二芳基碳酸酯;和(III)纯化二芳基碳酸酯以获得高纯度二芳基碳酸酯。