TiSiW12O40/TiO2催化合成苯甲酸酯的研究

摘要

The benzoic esters were synthesized by esterification of propylalcohol, n-butyl alcohol, n-amyl alcohol, and isoamyl alcohol and benzoic acid using TiSiW12O40/TiO2 as heterogeneous catalyst, and the reaction conditions were selected. The experimental results showed that TiSiW12O40/TiO2 was an excellent catalyst for the synthesis of benzoic esters, and the optimun reaction conditions were molar ratio of alcohol to acid 4∶1, catalyst amount(based on the total amount of raw materials) 1.5%～2.5%, and reaction time 1.5～2.5 h. Under this conditions, the yields of propyl benzoic ester, n-butyl benzoic ester, n-amyl benzoic ester，and iso-amyl benzoic ester respectively were 40.5%，75.6%，96.7%，and 83.3%。%以固载杂多酸盐TiSiW12O40/TiO2为多相催化剂，以丙醇、丁醇、戊醇、异戊醇和苯甲酸为原料合成了一系列苯甲酸酯，并对反应条件进行了研究。实验表明，TiSiW12O40/TiO2是合成苯甲酸酯的良好催化剂，最佳反应条件为：醇酸摩尔比为4∶1，催化剂用量为反应物料总量的1.5%～2.5%，反应时间为1.5～2.5h。上述条件下，苯甲酸丙酯的产率为40.5%，苯甲酸丁酯的产率为75.6%，苯甲酸戊酯的产率为96.7%,苯甲酸异戊酯的产率为83.3%。