负载钛酸酯催化剂在酯交换法合成邻苯二甲酸二环己酯中的应用

Application of a New Polymer-Supported Titanium Catalyst in Synthesis of Dicyclohexyl phthalate by Transesterification

将聚乙烯醇与四氯化钛在二甲基亚砜和无水乙醇混合溶剂中进行反应，制得了负载钛酸酯催化剂PVAC-1，研究了在其催化下，邻苯二甲酸二甲酯与环己醇通过酯交换合成邻苯二甲酸二环己酯（DCHP）时催化剂用量、反应时间、催化剂重复使用次数及物料配比等对反应的影响。结果表明该催化剂具有与烷基钛酸酯T i（OBu）4相当的催化活性，在140-160℃下，反应6h，催化剂用量为物料总质量的1.3-1.6%时，酯的收率即可达到94.2%，重复使用6次后，收率仍在85%以上，且该催化剂制备方法简单，易与产物分离。

A stable polymer supported titanate PVAC-1 was synthesized by reacting titanium tetrachloride with polyvinyl alcohol in dimethyl sulfoxide and ethyl alcohol solutions. The relations between reaction time, amount of catalyst ,reaction temperature, reuse times and yield of dicyclohexyl phthalate （DCHP）by transesterifying was studied . The results showed that the catalyst has the same catalytic activity as Ti （OBu）4, and has a yield of dicyclohexyl phthalate of 94. 2% under reaction temperature 140-160℃, reaction time 6 h, catalyst amount 1.3- 1.6% of total raw materials, and remains a yield over 85% after reusing 6 times. It is proved that the catalyst can be separated easily from products and can be recovered and reused.