树脂D001负载磷钨酸催化合成肉桂酸酯

Catalytic Synthesis of Cinnate by Phosphotungstic Acid Supported on Resin D001

摘要:

以肉桂酸和正丁醇反应为例，采用强酸性阳离子树脂D001负载磷钨酸为催化剂，对肉桂酸酯的合成进行了详细的研究。考察了醇酸物质的量之比、反应时间和反应温度、催化剂的用量和催化剂的重复使用性等因素对反应酯化率的影响。结果表明较佳的工艺条件为：反应温度为100℃，反应时间3h，酸醇物质的量之比为1:3，催化剂质量占肉桂酸总质量的15%，在此较优的条件下酯化率达92.4%。催化剂不经处理重复使用4次，酯化率都在83%以上，说明催化剂具有良好的重复使用性。依据上述较佳的工艺条件，进一步催化合成其它肉桂酸酯，酯化率均超过85%，表明树脂D001负载磷钨酸催化效果良好。

Abstract:

The synthesis of cinnamate catalyzed by phosphotungstic acid supported on strong acid cationic resin D001 was studied with cinnamic acid and n-butyl alcohol as beginning materials.The factors effected on the reaction yields, such as the reactants ratios, reaction time, temperature, the amount of catalyst and the reusability of catalyst, were investigated. The result showed that the optimized conditions were as follows: the reaction temperature was 100° C, the reaction time was 3 hours, the ratio of acid and alcohol was 1:3, and the catalyst dosage was 15% (based on total mass of cinnamic acid). Under the optimum conditions, the percentage of esterifation achieves 92.4% and the yield was above 83% after the catalyst was used for 4 times without any treatment. The synthesis of several other cinnamates were also studied in the optimum conditions, and the percentages of esterifation were all over 85%.It was showed that the catalyst of phosphotungstic acid supported on resin D001 has a good catalytic effect.