申请人:Tanaka Shuji
公开号:US20120296063A1
公开(公告)日:2012-11-22
Disclosed is a process for preparing a diaryl oxalate which comprises the step of transesterifying a dialkyl oxalate or/and an alkylaryl oxalate with an aryl alcohol in the presence of a tetra(aryloxy)titanium as a catalyst, wherein the tetra(aryloxy)titanium is fed into a reaction system of the transesterification as an aryl alcohol solution of the tetra(aryloxy)titanium which is prepared by reacting a tetraalkoxy titanium and an excess amount of the aryl alcohol and removing a by-producing alkyl alcohol.
揭示了一种制备二芳基草酸酯的方法,包括在四(芳氧基)钛存在下,通过将二烷基草酸酯和/或烷基芳基草酸酯与芳基醇进行酯交换的步骤,其中四(芳氧基)钛以芳基醇溶液的形式加入酯交换的反应系统中,该芳基醇溶液是通过将四烷氧基钛和过量的芳基醇反应制备的,并去除生成的副产物烷基醇。