Thermodynamic Properties of Ternary Liquid Mixtures Containing <i>o</i>‑Chlorotoluene: Excess Molar Volumes and Excess Isentropic Compressibilities

Abstract

Densities and speeds of sound of ternary <i>o</i>-chlorotoluene (1) + tetrahydropyran (2) + benzene or toluene or <i>o</i>-xylene (3) mixtures and their sub-binaries <i>o</i>-chlorotoluene (1) + toluene or <i>o</i>-xylene (2) at (298.15, 303.15, and 308.15) K have been measured, and of tetrahydropyran (1) + benzene or toluene or <i>o</i>-xylene (2) mixtures at (298.15 and 303.15) K and 0.1 MPa. Excess molar volumes, <i>V</i>₁₂₃^E and <i>V</i>^E, and excess isentropic compressibilities, (κ_S^E)₁₂₃ and κ_S^E, have been computed from experimental data. The <i>V</i>₁₂₃^E for <i>o</i>-chlorotoluene (1) + tetrahydropyran (2) + <i>o</i>-xylene (3) and (κ_S^E)₁₂₃ for <i>o</i>-chlorotoluene (1) + tetrahydropyran (2) + benzene or toluene or <i>o</i>-xylene (3) are negative over the entire mole fraction of 1 and 2. However, the sign and magnitude of <i>V</i>₁₂₃^E for <i>o</i>-chlorotoluene (1) + tetrahydropyran (2) + benzene or toluene (3) mixtures are dictated by the relative proportion of the constituents. The excess functions have been analyzed in terms of Graph theory, Prigogine–Flory–Patterson theory, and Sanchez and Lacombe’s theories