气相色谱法在离子液体与烷烃和脂类化合物相互作用研究中的应用

Application of gas chromatography on interaction of ionic liquids with alkanes and lipids

目的探讨离子液体与烷烃和脂类化合物的相互作用。方法采用气相色谱法，分别以三种离子液体——1-丁基-3-甲基咪唑双三氟甲烷磺酰亚胺离子液体[BMIm][NTf2]、实验室自制1-乙酸甲酯基-3-甲基双三氟甲磺酰亚胺离子液体[XMIml[NTf2]和1一对甲基苯甲酸甲酯基-3-甲基双三氟甲磺酰亚胺离子液体[YMIm][NTf2]作为固定相，以正己烷、正庚烷、正辛烷、正壬烷、三氯甲烷和乙酸乙酯为探针分子，计算70—110℃柱温的比保留体积、无限稀释质量分数活度系数、摩尔吸收焓、无限稀释摩尔混合焓和摩尔蒸发焓。结果不同柱温下，烷烃和三氯甲烷在【BMIm】[NTf2]柱，乙酸乙酯在【XMIm】[NTf2]柱的比保留体积较大；乙酸乙酯在[XMImJ[NTf2]柱的无限稀释质量分数活度系数较小；乙酸乙酯的无限稀释摩尔混合焓较小。结论【BMIm】【NTf2】与烷烃的相互作用较强，【XMIm】[NTf2]与乙酸乙酯的相互作用较强。

To explore the application of gas chromatography on interaction of ionic liquids with alkanes and lipids. Methods Three ionic liquids, [BMIm][NTf2], [XMIm][NTf2] and [YMImI[NTf2] were chosen as the stationary phase in gas chromatography respectively. Hexane, heptane, octane, nonane, chloroform, ethyl acetate were used as probe solutes. By using gas chromatography method, the retention time of the probe molecule was measured at 70-110 ~C, the retention volume（VsC）, the activity coefficients at infinite dilution （~1~）, the molar enthalpy of absorption （AHj~）, the partial molar enthalpy of mixing at infinite dilution ＂（AH~~）, and enthalpy of evaporation of the probe molecules （AHv）, were calculated. Results Alkanes and chloroform in [BMIm][NTf2], and ethyl acetate in [XMIm][NTf2] had higher Vs. Ethyl acetate in [XMIm][NTf2] had lower of ethyl acetate was lower. Conclusion [BMIm][NTf2] had stronger interaction with alkenes,[XMIm][NTf2] had stronger interaction with ethvl acetate.