1-甲基-3-乙基咪唑醋酸盐制备及密度、电导率的测定

On preparation and density and conductivity of 1-ethyl-3-methylimidazolium acetate

用N-甲基咪唑与溴乙烷为原料反应制得[Emim]Br,再以[Emim]Br和无水醋酸钠为原料,丙酮为溶剂进行反应制得离子液体1-甲基-3-乙基咪唑醋酸盐([Emim]Ac).测定[Emim]Ac在288.05 K至338.14 K之间的密度、电导率,计算得出相应温度下[Eimm]Ac的摩尔电导率.结果表明,[Emim]Ac的密度随温度的升高而减少,[Emim]Ac的电导率和摩尔电导均随温度的升高而增大.用多项式结合最小二乘法分别拟合了[Emim]Ac的密度、电导率和摩尔电导率与温度的函数关系,拟合标准偏差分别为0.000 7g/cm3,0.011 5mS/cm,0.187 2mS.cm2/mol.

l-ethyl-3-methylimidazolium bromide was obtained by N-methyl imidazole as the raw material reacts withethyl bromide. Further, 1-ethyl-3-methylimidazolium acetate ionic liquids（[EmimJAc） was synthesized by 1-ethyl-3-methylimidazolium bromide and sodium acetate. The conductivity and density of [ Emim] Ae at temperatures between 288. 05K to 338. 14K were measured, and the molar conductivity of [Emim] Ae was calculated at the corresponding temperature. The results show that the [Emim]Ac density decreases with increasing temperature, and the [Emim]Ae conductivity and molar conductivity increase with increasing temperature. The density, conductivity and molar conductivity of [ Emim] Ae are fitted by the 13olynomial and nonlinear least-square regression together, so the fitting standarddeviation is respectively O. 000 7g/cm^3 ,0. 0115ms · cm^-1 ,0. 187 2ms · cm^-1 · mol^-1