Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

This paper reports densities, qijk and speeds of sound, uijk data of ternary {1-butyl-2,3- dimethylimidazolium tetrafluoroborate (i) + 1-butyl-3-methylimidazolium tetrafluoroborate or 1-ethyl- 3-methylimidazolium tetrafluoroborate (j) + cyclopentanone or cyclohexanone (k)} mixtures at temperatures 293.15 K to 308.15 K using a digital densimeter and speed of sound analyser. The observed qijk and uijk data have been employed to determine excess molar volumes, VE ijk and excess isentropic compressiblities, ojES Pijk respectively of the studied mixtures. The topology of the constituent molecules (Graph theory) of the binary ionic liquid mixtures has recently been utilized (Gupta et al., 2016) to predict their VE, jES , HE and Cp E data. In the present studies, the topology of the components of the ternary mixtures (comprise of two ionic liquids and one organic solvent) has been employed (Graph theory) to obtain expressions for VE ijk and ojES Pijk data that describe well the measured VE ijk and ojES Pijk values. The observed VE ijk and ojES Pijk values have also been tested in terms of Prigogine-Flory-Patterson (PFP) theory. It has been observed that VE ijk and ojES Pijk values predicted by Graph theory are comparable with the experimental values.