离子液体[hnmp]HSO_4催化合成月桂酸乙酯

以离子液体[hnmp]HSO4为催化剂,4A分子筛为脱水剂,无水乙醇为带水剂,月桂酸和无水乙醇为原料合成香料月桂酸乙酯,采用FT-IR和GC-MS等对产物结构进行表征。在单因素实验基础上,通过正交实验对月桂酸乙酯合成工艺进行优化,得到最佳工艺条件:月桂酸与无水乙醇物质的量比为0.04∶0.60,离子液体用量1.50 g,反应温度85℃,反应时间10 h。此工艺条件下,月桂酸乙酯产率达92.38%。离子液体对于合成月桂酸乙酯具有良好的催化性能,重复使用4次,仍有较好的催化活性。

Synthesis of ethyl laurate catalyzed by[ hnmp]HSO4 ionic liquid catalyst

Ethyl laurate was synthesized by using lauric acid and anhydrous ethanol as the raw material,ionic liquid ［hnmp］HSO₄ as the catalyst and 4A molecular sieve as the dehydrating agent.The structure of product was analyzed by means of FT-IR and GC-MS.On the basis of single-factor experiments,the orthogonal experiments was carried out to obtain the optimized reaction condition.The results showed that the yield of ethyl laurate could reach up to 92.38％ under the optimal condition as follows:ionic liquid amount 1.50 g,lauric acid/anhydrous ethanol molar ratio 0.04∶0.60,reaction temperature 85 ℃ and reaction time 10 h.［hnmp］HSO₄ ionic liquid for synthesis of ethyl laurate had good catalytic activity even after being reused for 4 times.