Abstract
This work presents the new experimental data on physical and thermodynamic properties of binary system composed of tri(butyl)ethylphosphonium diethylphosphate and water: solid-liquid equilibrium (SLE) and vapor-liquid equilibrium (VLE) phase diagrams as well as the excess enthalpy of mixing. SLE phase diagram has been determined at wide temperature and composition range using two techniques: dynamic method and differential scanning calorimetry (DSC). Interesting behavior with a solid compound formation was observed for the studied mixture. The isothermal VLE have been measured by an ebulliometric method within temperature range from T=(328.15 to 368.15)K and pressure up to 100kPa. The excess enthalpy for the tested binary system was determined at T=298.15K using isothermal titration calorimeter. Liquid density for pure IL and the binary mixtures with water has been determined at temperature range from T=(298.15 to 348.15)K and from experimental data, the excess molar volumes were calculated. The influence of temperature and composition on measured properties is discussed in terms of IL-water molecular interactions. Furthermore, the binary mixture under study was discussed as an alternative working pair for the absorption heat pump cycle.
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