磷钨酸铝合成柠檬酸三丁酯

以磷钨酸和结晶三氯化铝为原料合成磷钨酸铝，并以此为催化剂, 由柠檬酸与正丁醇合成柠檬酸三丁酯。考察了醇酸物质的量比、催化剂用量、反应时间和反应温度对酯化反应的影响，得出合成柠檬酸三丁酯的最优化条件为：醇酸物质的量比为4.5∶1，催化剂用量为柠檬酸质量的2.5%，反应时间4 h, 反应温度150 ℃，产品的收率达93.5 %。将磷钨酸铝与其他类型的催化剂进行比较，证明磷钨酸铝催化高效，可回收使用。并对合成的产品进行了红外光谱分析及折光率的测定。

Synthesis of tributyl citrate catalyzed by AlPW12O40

AlPW₁₂O₄₀was used as a heterogeneous catalyst for synthesis of tributyl citrate. The effects of dosage of catalyst, ratio of the reactants, reaction temperature and reaction time were investigated. The optimal reaction condition was as follows: citric acid 0.1 mol, n butyl alcohol/citric acid molar ratio 4.5∶1, catalyst dosage 2.5 % (based on mass of citric acid), reaction time 4 h, reaction temperature 150 ℃. Tributyl citrate yield of 93.5 % was attained.