Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Densities, ?123, and speeds of sound, u123, of 1-ethyl-3-methylimidazolium tetrafluoroborate (1) + 2-methylaniline (2) + pyridine or a-, ss-, or ?-picoline (3) ternary mixtures have been measured over the entire range of composition at 293.15 K, 298.15 K, 303.15 K, and 308.15 K using density and speed of sound analyzer (Anton Paar DSA 5000). The heat capacity, Cp, of pure liquids pyridine and a-, ss-, and ?-picoline have also been measured at 293.15 K, 298.15 K, 303.15 K, and 308.15 K using differential scanning calorimeter. The measured data have been employed to determine excess molar volumes, V123E and excess isentropic compressibilities,(?SE)123. The V123E and(?SE)123 data have been fitted to Redlich Kister equation to calculate ternary adjustable parameters and standard deviations. The thermodynamic properties of the ternary mixtures have been analyzed in terms of Graph (which deals with the topology of the constituent of mixtures) and Prigogine-Flory-Patterson (PFP) theories. It has been observed that Graph theory describes well V123E and (?SE)123 data of the studied ternary ionic liquid mixtures. However, PFP theory correctly predicts the sign of V123E and (?SE)123 data of the studied mixtures.