申请人:Asahi Kasei Chemicals Corporation
公开号:EP1964831A1
公开(公告)日:2008-09-03
It is an object of the present invention to provide a specific process that enables a high-purity diphenyl 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 a phenol. When producing, from a cyclic carbonate and a phenol, a high-purity diphenyl carbonate required for producing a high-quality high-performance aromatic polycarbonate, the above object can be attained by carrying out a process according to the present invention which comprises steps of: (I) producing a dialkyl carbonate and a diol using a reactive distillation column having a specified structure; (II) producing a diphenyl carbonate using two reactive distillation columns each having a specified structure, and (III) obtaining a high-purity diphenyl carbonate from the diphenyl carbonate using a high boiling point material separating column A and a diphenyl carbonate purifying column B.
本发明的目的是提供一种特定工艺,使得可以从环状碳酸酯和酚中稳定地大量(例如不少于1吨/小时)工业化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苯碳酸酯,且生产时间持续较长(例如不少于1000小时,最好不少于3000小时,更好地不少于5000小时)。在从环状碳酸酯和酚中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苯碳酸酯时,可以通过进行本发明的工艺步骤来实现上述目的,包括以下步骤:(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元醇;(II)使用具有特定结构的两个反应精馏塔生产二苯碳酸酯;以及(III)通过使用高沸点物分离塔A和二苯碳酸酯纯化塔B从二苯碳酸酯中获得高纯度二苯碳酸酯。