Citation: 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. doi: 10.3724/SP.J.1123.2014.09018 shu

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

LI Xiaoping ^1,2 ,
WANG Qiang ^1,, ,
LI Ling ² ,
DING Yanping ^1,2

1.
1. Center for Physical and Chemical Analysis, Xinjiang University, Urumqi 830046, China;

Corresponding author: WANG Qiang,
Received Date: 10 September 2014
Available Online: 28 October 2014
Fund Project: National Natural Science Foundation of China (Grant No. 21366029) (Grant No. 21366029)

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