A quick and green process to prepare [Rmim]OH solutions is developed based on fast ion exchange between OH− and halide ions (halide = Cl− or Br−) in ethanol. Five ionic liquids were synthesized by neutralizing the obtained [Rmim]OH solution with acids to verify the feasibility of the whole process. The halogen content in the finally obtained ionic liquids and the experimental factors influencing the content are mainly discussed. Moreover, two other alcohols besides ethanol, propanol and iso-propanol, were further examined as solvents. The results show that this process, together with the alkylation and hydroxide anion route, is simple and efficient for preparing various ionic liquids, and that the process is a complementary synthetic route to existing strategies to prepare various ILs.
基于 OH- 与
乙醇中的卤化物离子(卤化物 = Cl- 或 Br-)之间的快速离子交换,开发了一种制备 [Rmim]OH 溶液的快速绿色工艺。通过用酸中和得到的 [Rmim]OH 溶液,合成了五种
离子液体,以验证整个工艺的可行性。主要讨论了最终得到的
离子液体中的卤素含量及其影响因素。此外,还进一步研究了除
乙醇之外的另外两种醇,即
丙醇和
异丙醇作为溶剂的情况。结果表明,该工艺与烷基化和
氢氧阴离子路线一起,可简单高效地制备各种
离子液体,是现有制备各种
离子液体策略的补充合成路线。