用恒温热重法测定1-己基-3-甲基咪唑苏氨酸离子液体[C<sub>6</sub>mim][Thr]蒸汽压和蒸发焓

引用本文: 佟静, 屈晔, 井立强, 刘璐, 刘春辉. 用恒温热重法测定1-己基-3-甲基咪唑苏氨酸离子液体[C₆mim][Thr]蒸汽压和蒸发焓[J]. 物理化学学报, 2018, 34(2): 194-200. doi: 10.3866/PKU.WHXB201707262 shu

Citation: TONG Jing, QU Ye, JING Liqiang, LIU Lu, LIU Chunhui. Measurement of Vapor Pressure and Vaporization Enthalpy for Ionic Liquids 1-Hexyl-3-methylimidazolium Threonine Salt[C₆mim][Thr]by Isothermogravimetric Analysis[J]. Acta Physico-Chimica Sinica, 2018, 34(2): 194-200. doi: 10.3866/PKU.WHXB201707262 shu

用恒温热重法测定1-己基-3-甲基咪唑苏氨酸离子液体[C₆mim][Thr]蒸汽压和蒸发焓

辽宁大学化学院, 沈阳 110036
基金项目:
国家自然科学基金（21273003）资助项目

摘要: 用中和法合成了氨基酸离子液体（AAIL）1-己基-3-甲基苏氨酸盐[C₆mim][Thr]，并用核磁共振氢谱（¹H NMR）和核磁共振碳谱（¹³C NMR）进行了表征。以苯甲酸为参考物质，用恒温热重法确定了AAIL[C₆mim][Thr]的蒸汽压和在平均温度下（T_av=438.15 K）的蒸发焓（△^g_lH_m^θ （T_av）=128.5±6.0 kJ·mol^-1）。利用Verevkin等人提出的方法计算得到AAIL[C₆mim][Thr]气态和液态的恒压热容差（△^g_lC_pm^θ=-70.8 J·K^-1·mol^-1），进而计算了不同温度的蒸发焓，其中参考温度（298.15 K）下的蒸发焓△^g_lH_m^θ （298.15 K）=138.4 kJ·mol^-1，只比应用我们提出的蒸发焓理论模型估算值大1.6 kJ·mol^-1，小于恒温热重法的实验误差3.0 kJ·mol^-1，说明这个蒸发焓的理论模型有一定的合理性。借助Clausius-Clapeyron方程估算了AAIL[C₆mim][Thr]的假想的正常沸点T_b=522.07 K，以及沸点的蒸发熵△^g_lS_m^θ （T_b）=228.5 J·K^-1·mol^-1，进一步得到了不同温度的蒸发熵和蒸发自由能△^g_lG_m^θ （T），其结果表明蒸发自由能随着温度的上升而减小，达到沸点温度Tb时变为零，而蒸发熵则随着温度上升而增大，是AAIL[C₆mim][Thr]蒸发过程的驱动力。

关键词:

English

Measurement of Vapor Pressure and Vaporization Enthalpy for Ionic Liquids 1-Hexyl-3-methylimidazolium Threonine Salt[C₆mim][Thr]by Isothermogravimetric Analysis

College of Chemistry, Liaoning University, Shenyang 110036, P. R. China
Received Date: 16 June 2017
Revised Date: 11 July 2017
Fund Project:
The project was supported by the National Natural Science Foundation of China (21273003)

Abstract: The amino acid ionic liquid (AAIL) 1-hexyl-3-methylimidazolium threonine salt,[C₆mim] [Thr], was prepared by the neutralization method and its structure was confirmed by ¹H and ¹³C NMR spectroscopy. Using benzoic acid as the reference material, the vapor pressure and evaporation enthalpy △^g_lH_m^θ (T_av) of[C₆mim] [Thr] were determined by isothermogravimetric analysis at the average temperature (T_av=438.15 K) and △^g_lH_m^θ (T_av) was found to be (128.5 ±6.0) kJ·mol^-1. Using Verevkin's method, the difference between the heat capacities of the vapor and liquid phases, △^g_lC_pm^θ, was calculated to be -70.8 J·K^-1·mol^-1. Subsequently, the enthalpy of vaporization for AAIL[C₆mim] [Thr] at different temperatures was determined based on the reference enthalpy of vaporization at 298.15 K, △^g_lH_m^θ (298.15 K)=138.4 kJ·mol^-1. This value is 1.6 kJ·mol^-1 higher than that predicted by our theoretical model and less than the experimental error (±3.0 kJ·mol^-1) of the isothermogravimetric method. These results show that our theoretical model for determining the evaporation enthalpy of ILs is reasonable. In terms of the Clausius-Clapeyron equation, the hypothetical normal boiling point, Tb, was estimated to be 522.07 K. Thus, the evaporation entropy, △^g_lS_m^θ (T), and the evaporation Gibbs free energy, △^g_lG_m^θ (T), of[C₆mim] [Thr] could be determined for different temperatures. These results showed that △^g_lG_m^θ (T) decreases as the temperature increases, the evaporation entropy increases with increaseing temperature. Furthermore, the latter is the driving force in the evaporation process of the AAIL[C₆mim] [Thr].

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

用恒温热重法测定1-己基-3-甲基咪唑苏氨酸离子液体[C₆mim][Thr]蒸汽压和蒸发焓

English

Measurement of Vapor Pressure and Vaporization Enthalpy for Ionic Liquids 1-Hexyl-3-methylimidazolium Threonine Salt[C₆mim][Thr]by Isothermogravimetric Analysis

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Measurement of Vapor Pressure and Vaporization Enthalpy for Ionic Liquids 1-Hexyl-3-methylimidazolium Threonine Salt[C6mim][Thr]by Isothermogravimetric Analysis

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