Chinese Journal of Applied Chemistry ›› 2017, Vol. 34 ›› Issue (7): 824-832.DOI: 10.11944/j.issn.1000-0518.2017.07.160423

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Determination of Thermodynamic Parameters of Organic Solvents in Ionic Liquid 1-Butyl-3-methylimidazolium Hexafluorophosphate by Inverse Gas Chromatography

TIAN Luoyangab,CHEN Yalic,WANG Qiangab*()   

  1. aCenter for Physical and Chemical Analysis,Xinjiang University,Urumqi 830046,China
    bKey Laboratory of Coal Cleaning Conversion and Chemical Engineering Process,Xinjiang Uyghur Autonomous Region,College of Chemistry and Chemical Engineering,Xinjiang University,Urumqi 830046,China
    cService Center of Public Technology Xinjiang Institute of Ecology and Geography CAS,Urumqi 830046,China
  • Accepted:2017-01-23 Online:2017-07-04 Published:2017-07-04
  • Contact: WANG Qiang
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21366029, No.21566036)

Abstract:

Thermodynamic parameters of eighteen kinds of organic solvents in ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate([BMIM]PF6) were determined by inverse gas chromatography(IGC) from 343.15 to 373.15 K. The molar enthalpy of sorption, mass fraction activity coefficient, Flory-Huggins interaction parameter, partial molar enthalpy of mixing, and activity coefficient at infinite dilution, were calculated to determine the interactions between [BMIM]PF6 and selected solvents at the indicated temperature range. n-Alkanes, cyclohexane, tetrahydrofuran, ether, and carbon tetrachloride were found to be poor solvents for [BMIM]PF6, while benzene, toluene, m-xylene, dichloromethane, acetone, chloroform, ethyl acetate, methyl acetate, ethanol, and carbinol were favorable solvents for this ionic liquid.

Key words: inverse gas chromatography, ionic liquid, Flory-Huggins interaction parameter, activity coefficient at infinite dilution