混合离子液体中乙酸苄酯的合成

Synthesis of Benzyl Acetate in Mixed Ionic Liquid

采用廉价的硫酸分别部分交换咪唑型和吡啶型季铵盐中的氯离子,得到在室温下为液体的混合离子液体2[BMIM]Cl/[BMIM]2SO4与2[BPy]Cl/[BPy]2SO4,并在所合成的混合离子液体中,进行了乙酸钠与苄氯反应合成乙酸苄酯的研究;探讨了温度、反应时间和乙酸钠与苄氯的摩尔比对乙酸苄酯产率的影响,得到了合成乙酸苄酯的最佳工艺条件。将两种混合离子液体2[BMIM]Cl/[BMIM]2SO4和2[BPy]Cl/[BPy]2SO4进一步混合,得到的乙酸苄酯的产率高于单独使用2[BMIM]Cl/[BMIM]2SO4或2[BPy]Cl/[BPy]2SO4混合离子液体时的值,且当两种混合离子液体的摩尔比为1∶1时,乙酸苄酯的产率达到最大值。该方法可简化离子液体的生产工艺,有效降低离子液体的生产成本。

The mixed ionic liquid 2 [BMIM] Cl/[BMIM]2SO4 and 2 [BPy] Cl/[-BPy]2SO4 which were liquid in room temperature were prepared by using low-cost vitriol to partially exchange chlorine ion of [BMIM]Cl and [BPy]Cl. The synthesis of benzyl acetate from sodium acetate and benzyl chloride was investigated in two kinds of mixed ionic liquids,respectively. After comparing the influence of temperature, reaction time and molar ratio of sodium acetate and benzyl chloride on the yield of benzyl acetate, the best condition was obtained. The yield of benzyl acetate would increase by combined 2[BMIM]Cl/[BMIM]2SO4 with 2[BPy]Cl/ [BPy]2SO4 and it would reach the maximum when the molar ratio of 2[BMIM]Cl/ [BMIM]2SO4 and 2[BPy]Cl/[BPy]2SO4 is 1： 1. All these results offered a new approach to predigest the production of ionic liquid, decrease the cost and improve applied worthiness.