Acoustic and volumetric studies on water plus diethylene glycol mixtures in a wide temperature range. Comparison with mixtures of water with tri- and tetraethylene glycol

Densities (rho) and sound velocity (u) were measured in the binary liquid mixture of water and diethylene glycol water (DEG) over the entire mixture composition range. Density values were recorded in a temperature range of 278.15-333.15 K under atmospheric pressure, using a precise sealed vibrating-tube densimeter. Sound speed values were recorded in a range of 288.15-318.15 K. The values of molar volume (V-m), adiabatic compressibility co-efficient (beta(s)), temperature coefficients of these parameters, excess of compressibility coefficient (beta(E)(S)), excess molar volume (V-m(E)) and derivatives (partial derivative H/partial derivative p), (partial derivative S/partial derivative p) and (partial derivative Cp/partial derivative p) were determined from the experimental data. The values of molar volume were used to determine the values of partial molar volumes of the mixture components. Changes in the values of physicochemical parameters measured and calculated as functions of composition and temperature were analyzed in the aspect of intermolecular interactions in two-component systems. The results obtained were compared with the results of similar studies of the mixtures of water and tri- and tetraethylene glycols. (C) 2016 Elsevier B.V. All rights reserved.