Thermodynamic Properties of Ternary Liquid Mixtures of 2-Pyrrolidinone with Aromatic Hydrocarbons

Abstract

Molar excess volumes, \({V^{\rm E}_{ijk}}\), and speeds of sound, uijk, of 2-pyrrolidinone (2-Py) (i) + toluene (j) + o-xylene or p-xylene (k) ternary mixtures have been determined by using a dilatometer and interferometer as a function of composition at 308.15 K. The speeds of sound of ternary mixtures have been utilized to predict their excess isentropic compressibilities. The Redlich-Kister equation has been fitted to the molar excess volumes, \({V^{\rm E}_{ijk}}\), and excess isentropic compressibilities, \({\left( {\kappa _S^{\rm E}}\right)_{ijk}}\), to predict ternary adjustable parameters and standard deviations. The observed data have been analyzed in terms of the Flory theory and the Sanchez and Lacombe theory.