色谱Issue(1)：58-64,7.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
Determination of the thermodynamic parameters of ionic liquid 1-hexyl-3-methylimidazolium tetrafluoroborate by inverse gas chromatography
摘要
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-sol-vent 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,chloro-form,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·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 thermody-namic properties of ionic liquids. The obtained thermodynamic parameters revealed the strength of the interac-tions between the selected solvents and the ionic liquid,which could be used as a reference to the further appli-cations of the ionic liquid.关键词
反气相色谱法/离子液体/Flory-Huggins相互作用参数/无限稀释活度系数/溶解度参数Key words
inverse gas chromatography( IGC)/ionic liquid( IL)/Flory-Huggins interaction parameter/activi-ty coefficient at infinite dilution/solubility parameter分类
化学化工引用本文复制引用
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,(1):58-64,7.基金项目
National Natural Science Foundation of China（ Grant No．21366029）． （）
