The study of thermodynamic properties for binary mixtures of aromatic hydrocarbons with cyclohexane, at different temperatures and atmospheric pressure

The thermophysical properties as densities and speeds of sound, for two studied binary blends of cyclohexane with n-propylbenzene and isopropylbenzene, were measured over the entire interval of concentration, at some temperatures between (298.15 and 318.15) K and atmospheric pressure P = 0.1 MPa. The experimental values for densities and speeds of sound, have been correlated by the Jouyban-Acree model with good accuracy. From the obtained experimental data, the thermodynamic properties as the excess molar volumes, the partial/apparent molar volumes, the isentropic compressibilities, the excess isentropic compressibilities and the excess molar isentropic compressibilities, were calculated. The values of experimental excess molar volumes were used to test the applicability of the Prigogine-Flory-Patterson theory and the results were investigated in terms of molecular interactions and structural effects, occurred between the organic compounds from blends. A graphically comparison of the excess molar volumes, for both blends, shows that the values of volumescalculated by the Prigogine-Flory-Patterson theory predict well the experimental values of excess molar volumes. All the derived excess thermodynamic properties for both studied blends, were correlated with molar fraction by the Redlich-Kister polinomial equation.The values of excess properties have been represented graphically. The parameters of correlation were estimated and their values have been reported at working temperatures. The experimental and computed results concerning the relation to the molecular interactions and structural effects between studied organic compounds of blends are presented. © 2025