Thermodynamics Research Center / ThermoML | Thermochimica Acta

ABSTRACT

Densities and speeds of sound of 1-ethyl-3-methylimidazolium tetrafluoroborate (i) + 1-methyl pyrrolidin-2-one or pyrrolidin-2-one (j) + water (k) ternary mixtures have been measured over the complete mole fraction range at 293.15, 298.15, 303.15, and 308.15 K using density and speed of sound analyzer (Anton Paar DSA 5000). The heat capacity, Cp of water at 293.15, 298.15, 303.15, and 308.15 K have also been measured using differential scanning calorimeter (Model DSC 7 Evo). The measured data have been employed to determine excess molar volumes and excess isentropic compressibilities. The VE and kappa data have been fitted to Redlich Kister equation to calculate ternary adjustable parameters and standard deviations. The observed thermodynamic properties of the ternary mixtures have been analyzed in terms of Graph theory. It has been observed that Graph theory successfully describes well VE and kappa data of the studied ternary ionic liquid mixtures.