Volumetric deviations in ethyl lactate +1-alkanols (C 3 -C 6 ) binary systems: effect of alkyl chain discrepancy, excess thermodynamic and PC-SAFT studies

Densities (ρ) and speed of sound (c) for the four binary liquid mixtures of ethyl lactate (EL) with 1-propanol, 1-butanol, 1-pentanol and 1-hexanol were measured at different temperatures at (303.15 to 323.15) K, with an Anton Paar density and sound velocity analyser. Measured thermophysical properties increased with an increase in the mole fraction of EL and decreased with and increase in temperature. Furthermore, thermodynamics properties such as excess volume (VE), isentropic compressibility (ks) and excess isentropic compressibility ksE have been calculated using the measured data and fitted into the Redlich-Kister polynomial equation to confirm the accuracy of measured data. In addition, the variation in excess thermodynamic properties with composition and temperature have been discussed in terms of molecular interactions between component molecules in liquid mixtures.