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

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)

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].
- Ionic liquid,
- Isothermogravimetrical analysis,
- Enthalpy of vaporization,
- Vapor pressure,
- Threonine
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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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通讯作者: 陈斌, bchen63@163.com

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