反气相色谱法表征离子液体1-己基-3-甲基咪唑四氟硼酸盐的热力学参数

doi:10.3724/SP.J.1123.2014.09018

色谱 ›› 2015, Vol. 33 ›› Issue (1): 58-64.DOI: 10.3724/SP.J.1123.2014.09018

反气相色谱法表征离子液体1-己基-3-甲基咪唑四氟硼酸盐的热力学参数

李晓萍^1,2, 王强¹, 李玲², 丁艳萍^1,2

1. 新疆大学理化测试中心, 新疆乌鲁木齐 830046;
2. 新疆大学化学化工学院, 新疆乌鲁木齐 830046

收稿日期:2014-09-10 修回日期:2014-10-28 出版日期:2015-01-08 发布日期:2014-12-26
通讯作者: 王强
基金资助:
National Natural Science Foundation of China (Grant No. 21366029)

Determination of the thermodynamic parameters of ionic liquid 1-hexyl-3-methylimidazolium tetrafluoroborate by inverse gas chromatography

LI Xiaoping^1,2, WANG Qiang¹, LI Ling², DING Yanping^1,2

1. Center for Physical and Chemical Analysis, Xinjiang University, Urumqi 830046, China;
2. College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China

Received:2014-09-10 Revised:2014-10-28 Online:2015-01-08 Published:2014-12-26
Supported by:
National Natural Science Foundation of China (Grant No. 21366029)

摘要/Abstract

摘要：

采用反气相色谱法(IGC)表征了离子液体(IL)1-己基-3-甲基咪唑四氟硼酸盐([HMIM]BF₄)在343.15~373.15 K温度范围内的热力学参数.使用了一系列不同化学结构的探针分子测定[HMIM]BF₄与溶剂之间的相互作用力.根据探针分子的保留时间计算得到探针分子与[HMIM]BF₄之间的Flory-Huggins相互作用参数、摩尔吸附焓、无限稀释摩尔混合焓、摩尔蒸发焓、无限稀释活度系数以及[HMIM]BF₄的溶解度参数.结果表明,n-C₆、n-C₇、n-C₈、n-C₉、乙醚、四氢呋喃、苯、环己烷为[HMIM]BF₄的不良溶剂;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、乙酸甲酯为[HMIM]BF₄的良溶剂.运用外推法得到了[HMIM]BF₄在室温(298.15K)时的溶解度参数为23.70 (J·^-3)^0.5.实验结果证明反气相色谱法是一种简便准确的获得离子液体热力学参数的方法.获得的热力学参数体现了这种离子液体与探针分子之间的相互作用力.本研究为离子液体的进一步应用提供了参考.

关键词: Flory-Huggins相互作用参数, 反气相色谱法, 离子液体, 溶解度参数, 无限稀释活度系数

Abstract:

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·^-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.

Key words: activity coefficient at infinite dilution, Flory-Huggins interaction parameter, inverse gas chromatography (IGC), ionic liquid (IL), solubility parameter

中图分类号:

O658

李晓萍, 王强, 李玲, 丁艳萍. 反气相色谱法表征离子液体1-己基-3-甲基咪唑四氟硼酸盐的热力学参数[J]. 色谱, 2015, 33(1): 58-64.

LI Xiaoping, WANG Qiang, LI Ling, DING Yanping . Determination of the thermodynamic parameters of ionic liquid 1-hexyl-3-methylimidazolium tetrafluoroborate by inverse gas chromatography[J]. Chinese Journal of Chromatography, 2015, 33(1): 58-64.

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反气相色谱法表征离子液体1-己基-3-甲基咪唑四氟硼酸盐的热力学参数

Determination of the thermodynamic parameters of ionic liquid 1-hexyl-3-methylimidazolium tetrafluoroborate by inverse gas chromatography

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