高分子负载钛酸酯催化剂的制备及其在高沸点酯合成中的应用

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反应，制得负载钛酸酯催化剂PVAC-1，用红外光谱对其分子结构进行了表征，用比色法测定了催化剂中的Ti含量。研究了PVA–1在邻苯二甲酸二异辛酯（DOP）、己二酸二庚酯、苯甲酸异辛酯等高沸点酯合成过程中的活性。结果表明该催化剂具有与烷基钛酸酯Ti(OBu)4相当的催化活性。在催化合成上述3种高沸点酯时有机酸转化率分别达到99.8%、97.5%和99.7%。催化剂可多次重复使用。

Preparation and application of a new polymer-supported titanium catalyst in synthesis of high boiling esters

A polymer-supported titanate(PVAC–1) was prepared by the reaction of titanium tetrachloride with polyvinyl alcohol，and was been characterized with FTIR. The content of titanium of the catalyst was measured by the colorimetric analysis method. The supported titanate was used to catalyze esterification to form high boiling esters. The results showed that the catalytic activity of PVAC-1 was comparable with that of Ti(OBu)₄，a known highly active catalyst for the synthesis of high boiling esters. Using PVAC-1 as catalyst，the conversion of acid was up to 99.8%，97.5%，and 99.7% for the synthesis of DOP，di–heptanol and benzoate，respectively. The catalyst could be recycled without significant loss of activity.