树脂D001负载磷钨酸催化合成肉桂酸酯

Catalytic Synthesis of Cinnamate with Phosphotungstic Acid Supported on Resin D001

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,合成了肉桂酸酯。考察了醇酸摩尔比、反应时间和反应温度、催化剂用量和催化剂的重复使用性对反应酯化率的影响。结果表明,在反应温度100℃、反应时间3 h、酸醇摩尔比1∶3、催化剂质量占肉桂酸总质量15%的较优条件下,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。依据该较佳的工艺条件,进一步催化合成其他肉桂酸酯,酯化率均超过85%,表明树脂D001负载磷钨酸催化效果良好。

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 affecting the reaction yields,such as the reactants ratios,reaction time,temperature,the amount of catalyst and the reusability of catalyst,were investigated.The results show that the optimized conditions were as follows：the reaction temperature was 100 ℃,the reaction time was 3 hours,the mole ratio of acid to alcohol was 1：3,and the catalyst dosage was 15%（based on the total mass of cinnamic acid）.Under the optimum conditions,the percentage of esterification achieved 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 was also studied in the optimum conditions,and the percentages of esterification were all over 85%.It was shown that the catalyst of phosphotungstic acid supported on resin D001 has a good catalytic effect.