Densities, speed of sound, and IR studies of Ethyl lactate with 2-alkoxyethanols at different temperatures

Abstract

Densities and speeds of sound of the binary liquid mixtures of Ethyl lactate (EL) with 2-methoxyethanol (2-ME), 2-ethoxyethanol (2-EE) and 2-butoxyethanol (2-BE) have been measured over the entire composition range at temperatures of 303.15–318.15K. From the experimental values excess molar volume (VmE), excess partial molar volume (V¯m,1E, V¯m,2E), excess partial molar volume at infinite dilution (v1E)∞, (v2E)∞ and excess isentropic compressibility (KsE) are computed. The variation with the temperature and concentration is discussed in terms of molecular interactions. The excess molar volume and excess isentropic compressibility parameters are fitted to Redlich–Kister polynomial equation to estimate the binary interaction parameters. Thermodynamic studies of the present binary systems reveal strong inter molecular interactions between the unlike molecules. The strength of intermolecular interaction between EL and 2-alkoxyethanol molecules is found to follow the order EL+2-BE>EL+2-EE>EL+2-ME. The FT-IR analysis at various concentrations of these binary mixtures also suggest specific interaction between the unlike molecules and supported thermodynamic findings.