Thermodynamic study on some alkanediol solutions: Measurement and modeling

• Measuring densities and viscosities for binary mixtures of some alkanediols.
• Finding excess molar volume, partial molar volume and thermal expansion coefficient.
• Fitting excess molar volume values with PFP and Redlich–Kister polynomial equations.
• Deducing excess Gibbs free energy of activation and other thermodynamic parameters.
• Predicting viscosity values with different single parameter semi empirical equations.

The densities ρ and viscosities η of 1,2-ethanediol with 1,2-propanediol or 1,3-propanediol, and 1,2-propanediol with 1,3-propanediol binary liquid mixtures over the entire concentration range at temperatures (298.15 to 308.15) K with 5 K interval were measured. The experimental data were used to calculate the excess molar volume VmE, partial molar volume V¯m,i, partial molar volume at infinite dilution V¯i∞, apparent molar volume Vφi, coefficient of thermal expansion αp, excess coefficient of thermal expansion αpE, excess viscosity ηE, excess Gibbs energy of activation ΔG*E, and other thermodynamic parameters. A Redlich–Kister equation and Prigogine–Flory–Patterson (PFP) model was applied to correlate the excess molar volume results. Moreover, the viscosity data were correlated with the Grunberg–Nissan, Tamura–Kurata, Hind–Ubbelohde and Katti–Chaudhary equations. Good agreement was found between experimental data and modeling results.