超声波对氯代1-烯丙基-3-甲基咪唑离子液体合成的强化

采用超声波辅助加热回流的方法合成了氯代1–烯丙基–3–甲基咪唑离子液体(AMIM]Cl),并对其进行了紫外光谱(UV)和傅利叶红外光谱(FT–IR)表征。考察了反应物摩尔比、反应时间和超声波功率对离子液体的收率和纯度的影响,探讨了超声波对合成反应的强化效应。实验结果表明超声波能强化AMIM]Cl的合成,明显缩短合成时间,且其强化效应受反应物摩尔比的影响较小,而与超声波功率紧密相关。AMIM]Cl适宜的合成条件为反应温度50℃、反应时间2h、氯丙烯与1–甲基咪唑的摩尔比1.4、超声波功率100W,此时离子液体的收率和纯度分别为94.4%和99.2%。

Intensification of the Synthesis of 1-allyl-3-methylimidazolium Ionic Liquid by Ultrasonic Wave

1-allyl-3-Methylimidazolium Chloride ionic liquid （AMIM]Cl） was synthesized by using heating reflux and ultrasonic irradiation method, and characterized by UV and FT-IR. The influences of reactant molar ratio, reaction time and ultrasonic power on the yield and purity of AMIM]CI were discussed, and the enhancing effect of ultrasonic wave on the reaction was investigated. The experimental results showed that the application of ultrasonic wave intensified the synthesis process of the ionic liquid and reduced the synthesis time. The enhancive effect of ultrasonic wave was affected slightly by the reactant molar ratio, but closely related to ultrasonic power. The optimum synthesis condition was obtained as follows： reaction temperature, reaction time, ultrasonic power and the molar ratio of allyl chloride to 1-methylimidazole were 50 ℃, 2 h, 100 W and 1.4, respectively. The purity of the ionic liquid and the yield under the optimum condition was 94.4 % and 99.2 %, respectively.