申请人:Asahi Kasei Kogyo Kabushiki Kaisha
公开号:US06262210B1
公开(公告)日:2001-07-17
A process for producing aromatic carbonates, which comprises transesterifying, in the presence of a metal-containing catalyst, a starting material selected from a dialkyl carbonate, an alkyl aryl carbonate and a mixture thereof with a reactant selected from an aromatic monohydroxy compound, an alkyl aryl carbonate and a mixture thereof, characterized in that: at least one type of catalyst-containing liquid is taken out, wherein the catalyst-containing liquid is selected from a portion of a high boiling point reaction mixture obtained by the above transesterification and containing the desired aromatic carbonate and the metal-containing catalyst, and a portion of a liquid catalyst fraction obtained by separating the desired aromatic carbonate from the high boiling point reaction mixture, wherein each portion contains (A) high boiling point substance having a boiling point higher than the boiling point of the produced aromatic carbonate and (B) the metal-containing catalyst; (C) a functional substance capable of reacting with at least one component selected from high boiling point substance (A) and metal-containing catalyst (B) is added to the taken-out catalyst-containing liquid; and the (B)/(C) reaction product is recycled to the reaction system, while withdrawing the (A)/(C) reaction product. By the process of the present invention, the desired aromatic carbonates having high purity can be produced stably for a prolonged period of time.
一种生产芳香族碳酸酯的方法,包括在含金属催化剂的存在下,将从二烷基碳酸酯、烷基芳基碳酸酯和其混合物中选择的起始物与从芳香族单羟基化合物、烷基芳基碳酸酯和其混合物中选择的反应物进行酯交换反应,其特征在于:取出至少一种催化剂含液,所述催化剂含液选自通过上述酯交换反应获得的高沸点反应混合物的部分,其含有所需的芳香族碳酸酯和含金属催化剂,以及从高沸点反应混合物中分离所得的所需芳香族碳酸酯的液体催化剂分馏部分的部分,其中每个部分都包含(A)沸点高于所产生的芳香族碳酸酯的沸点的高沸点物质和(B)含金属催化剂;将能够与高沸点物质(A)和含金属催化剂(B)中的至少一种成分反应的功能性物质添加到取出的催化剂含液中;并将(B)/(C)反应产物回收到反应系统中,同时撤回(A)/(C)反应产物。通过本发明的方法,可以稳定地生产高纯度的所需芳香族碳酸酯,且生产时间可以延长。