钛酸钾催化DMC酯交换反应合成碳酸二异辛酯的研究

研究了碳酸二甲酯（DMC）与异辛醇（EHOH）酯交换合成碳酸二异辛酯（DEHC）的反应，对几种钾盐的催化性能比较，发现K2TiO3具有较好的催化活性和选择性。实验结果表明，K2TiO3为催化剂时，最佳反应条件为：反应温度140 ℃，反应时间2 h，n(DMC)∶n(EHOH)=1∶3，催化剂用量为原料总质量的1%，DMC转化率为72.1%，DEHC收率为57.6%，DEHC选择性为79.2%。

Transesterification of DMC and EHOH over potassium titanate for synthesis of di-2-ethyl hexyl carbonate(DEHC)

A transesterification process for synthesis of di-2-ethyl-hexyl carbonate(DEHC) from dimethyl carbonate(DMC) and 2-ethyl-hexanol（EHOH）was studied. Several potassium salts were compared as the catalysts for the transesterification, among which K₂TiO₃ exhibited better activity and selectivity. The optimum operation conditions for K₂TiO₃ catalyst were obtained as follows: reaction temperature 140 ℃, reaction time 2 h, n(DMC)∶n(EHOH) =1∶3, catalyst loadings = 1% of mass of the feed. DMC conversion of 72.1%, selectivity to DEHC of 79.2% and DEHC yield of 57.6% were attained under the optimum condition.