Speed of sound and density of water + 1,5-pentanediol mixtures in a wide temperature range. Comparison with mixtures of water with diethylene glycol, propoxyethanol and diethylene glycol dimethyl ether

Abstract

Densities (ρ) and speed of sound (u) were measured in the binary liquid mixture of water and 1,5-pentanediol (PD) over the entire mixture composition range. Densitometric measurement were conducted in a temperature range of 278.15–333.15K under atmospheric pressure, using a precise sealed vibrating-tube densimeter. Acoustic study was carried out in a range of 288.15–318.15K. The values of molar volume (Vm), adiabatic compressibility coefficient (βs), temperature coefficients of these parameters, excess of compressibility coefficient (βsE), excess molar volume (VmE) and derivatives (∂H/∂p), (∂S/∂p) and (∂Cp/∂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 measured and calculated values of the physicochemical parameters as a function of temperature and composition of the mixture were analysed in terms of interactions in two-component systems. The obtained results were compared with those received in our earlier investigations of the mixtures of water with diethylene glycol and propoxyethanol as well as with those found in the literature survey concerning water–diethylene glycol dimethyl ether mixtures.