Li Xiaoping, Wang Qiang, Li Ling, Ding Yanping
Se Pu. 2015 Jan;33(1):58-64. doi: 10.3724/sp.j.1123.2014.09018.
Inverse gas chromatography (IGC) was used to characterize the thermodynamic properties of ionic liquid (IL) 1-hexyl-3-methylimidazolium tetrafluoroborate ([HMIM] BF4) in the temperature range from 343.15 K to 373. 15 K. A series of solvents with different chemical natures were used to determine the [HMIM] BF4-solvent interactions. The thermodynamic parameters including Flory-Huggins interaction parameter, partial molar heats of sorption, mixing and evaporation as well as the activity coefficient at infinite dilution were obtained to judge the interactions between [HMIM]BF4 and the selected solvents. In addition, the solubility parameters of [HMIM] BF4 at different temperatures were determined. The results showed that among the selected solvents, n-C6, n-C7, n-C8, n-C9, diethyl ether, tetrahydrofuran, benzene and cyclohexane were poor solvents for [HMIM] BF4, while toluene, m-xylene, methanol, ethanol, dichloromethane, tetrachloromethane, chloroform, acetone, ethyl acetate and methyl acetate were the favorite ones. The solubility parameter of [HMIM]BF4 at room temperature (298.15 K) was 23.70 (J x cm(-3)(0.5), which was obtained by the linear extrapolation method. The experiment proved that IGC is a simple and accurate method to obtain the thermodynamic properties of ionic liquids. The obtained thermodynamic parameters revealed the strength of the interactions between the selected solvents and the ionic liquid, which could be used as a reference to the further applications of the ionic liquid.
采用反相气相色谱法（IGC）表征了离子液体1-己基-3-甲基咪唑四氟硼酸盐（[HMIM]BF4）在343.15 K至373.15 K温度范围内的热力学性质。使用一系列具有不同化学性质的溶剂来测定[HMIM]BF4与溶剂之间的相互作用。获得了包括弗洛里-哈金斯相互作用参数、吸附、混合和蒸发的偏摩尔热以及无限稀释下的活度系数等热力学参数，以判断[HMIM]BF4与所选溶剂之间的相互作用。此外，还测定了[HMIM]BF4在不同温度下的溶解度参数。结果表明，在所选溶剂中，正己烷、正庚烷、正辛烷、正壬烷、乙醚、四氢呋喃、苯和环己烷是[HMIM]BF4的不良溶剂，而甲苯、间二甲苯、甲醇、乙醇、二氯甲烷、四氯化碳、氯仿、丙酮、乙酸乙酯和乙酸甲酯是其优选溶剂。通过线性外推法得到[HMIM]BF4在室温（298.15 K）下的溶解度参数为23.70（J·cm-3）0.5。实验证明，IGC是一种获取离子液体热力学性质的简单而准确的方法。所获得的热力学参数揭示了所选溶剂与离子液体之间相互作用的强度，可为离子液体的进一步应用提供参考。
