Solubilities and Thermodynamic Study of Carbon Tetrachloride in Imidazolium Ionic Liquids at Different Temperatures

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• 作者：Jun Zhang ; Hairui Yao ; Chengxuan Li ; Xigang Du ; Xiaokang Bai ; Jingjing Li ; Junna Liu
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2014
• 出版时间：March 13, 2014
• 年：2014
• 卷：59
• 期：3
• 页码：672-677
• 全文大小：239K
• 年卷期：v.59,no.3(March 13, 2014)
• ISSN：1520-5134

文摘

Solubilities of carbon tetrachloride in four imidazolium ionic liquids including 1-butyl-3-methyl imidazolium bis(trifluoromethyl sulfonyl) imide ([Bmim][NTf<sub>2sub>]), 1-butyl-3-methyl imidazolium dicyanamide ([Bmim][N(CN)<sub>2sub>]), 1-butyl-3-methyl imidazolium hexafluorophosphate ([Bmim][PF<sub>6sub>]), and 1-butyl-3-methyl imidazolium tetrafluoroborate ([Bmim][BF<sub>4sub>]) 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 螖G<sub>ssub><sup>胃sup>, 螖H<sub>ssub><sup>胃sup>, and 螖S<sub>ssub><sup>胃sup> have been evaluated based on the solubility results. Through the calculation and analysis for polarity, steric hindrance, and interaction energy of CCl<sub>4sub> with the anions, the sequence of dissolving ability of the ionic liquids for CCl<sub>4sub> 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 CCl<sub>4sub> changes in the order x<sub>[Bmim][NTf2]sub> > x<sub>[Bmim][N(CN)2]sub> > x<sub>[Bmim][BF4]sub> > x<sub>[Bmim][PF6]sub>, and the dissolving ability of each ionic liquid goes up with an increase in temperature. The dissolution of CCl<sub>4sub> in the ionic liquids is an endothermic, enthalpy-driven process.