Study of thermodynamic properties of binary mixtures of propionitrile with dimethylsulfoxide (or diethylsulfoxide) at temperatures from (298.15 to 323.15)K

Abstract

In this work the thermodynamic properties such as volumetric and viscosity properties of binary mixtures of propionitrile with dimethylsulfoxide (or diethylsulfoxide) have been investigated with the use of density and viscosity measurements over the full range of compositions at temperatures from (298.15 to 323.15) K. Excess molar volumes, VmE, apparent molar volumes, Vϕ, i, partial molar volumes, V¯i, partial excess molar volumes, V¯iE partial molar volumes at infinite dilution, Vi∞, and thermal expansion coefficients, αp, for binary liquid mixtures were calculated. Viscosity deviations, ηE, and excess Gibbs energy, ΔG⁎E, of activation of viscous flow were calculated too. In addition, the FTIR measurements of these mixtures have been performed as well. The results obtained confirm that intermolecular interaction between sulfoxides and propionitrile molecules is stronger in propionitrile-diethylsulfoxide rather than in propionitrile-dimethylsulfoxide mixtures.