Thermodynamic and transport behaviour of binary liquid mixtures of benzyl alcohol with monocyclic aromatics at 303.15 K

This paper presents densities, ρ, ultrasonic speeds, u, viscosities, η, and refractive indices, n, of pure benzyl alcohol (BA), benzene (B), chlorobenzene (CB), benzonitrile (BN), nitrobenzene (NB), and their binary liquid mixtures, with BA as a common component, over the whole composition range at 303.15 K. The excess molar volumes, VE, deviations in isentropic compressibility, Δks, viscosity, Δη, ultrasonic speed, Δu, and in refractive index, Δn, were calculated from the experimental data. The apparent molar volumes, Vϕ,2, and apparent molar isentropic compressibilities, Kϕ,2, of B, CB, BN and NB in BA were also calculated. The values of Vϕ,2 and Kϕ,2 were used to estimate the partial molar volumes, V¯ϕ,20, and partial molar isentropic compressibilities, K¯ϕ,20, of B, CB, BN and NB in BA at infinite dilution. The variations of these parameters with composition of the mixtures suggest that the interaction between BA and B/CB/BN/NB molecules follow the sequence: B < CB < BN < NB. Apart from using density data for the calculation of VE, excess molar volumes have also been estimated by using Flory's statistical theory. The results show that Flory's theory predicts VE well for the mixture with least interaction between the component molecules while it shows large deviation for the mixture showing highest interaction.