Abstract
Solubilities of carbon tetrachloride in four imidazolium ionic liquids including 1-butyl-3-methyl imidazolium bis(trifluoromethyl sulfonyl) imide ([Bmim][NTf2]), 1-butyl-3-methyl imidazolium dicyanamide ([Bmim][N(CN)2]), 1-butyl-3-methyl imidazolium hexafluorophosphate ([Bmim][PF6]), and 1-butyl-3-methyl imidazolium tetrafluoroborate ([Bmim][BF4]) have been experimentally determined using the double-liquid phase isothermal equilibrium method in the temperature range from (298.15 to 318.15) K and at ambient pressure. An empirical equation was proposed to correlate the solubility data with temperatures. The dissolving thermodynamic function variations involving ΔGsθ, ΔHsθ, and ΔSsθ have been evaluated based on the solubility results. Through the calculation and analysis for polarity, steric hindrance, and interaction energy of CCl4 with the anions, the sequence of dissolving ability of the ionic liquids for CCl4 was discussed, and a dissolution mechanism as well as dissolution driving force have been suggested. The results show that at a certain temperature the dissolving ability of the ionic liquids for CCl4 changes in the order x[Bmim][NTf2] > x[Bmim][N(CN)2] > x[Bmim][BF4] > x[Bmim][PF6], and the dissolving ability of each ionic liquid goes up with an increase in temperature. The dissolution of CCl4 in the ionic liquids is an endothermic, enthalpy-driven process.
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