Viscometric Studies of Molecular Interactions in Binary Liquid Mixtures of Isomeric Xylenes with Methanol

Abstract

Dynamic viscosities (ηexp) for the binary mixtures of methanol with isomeric (o-, m-, and p-derivatives) xylenes were measured at T = (303.15, 308.15, 313.15, 318.15, and 323.15) K and atmospheric pressure (p = 101 kPa). The viscosity deviation (Δη) that has been derived from the ηexp was correlated using a Redlich–Kister-type equation. The ηexp values were compared with the calculated viscosities (ηcal) obtained using generalized correlation models, such as Bingham, Arrhenius, Kendall–Monroe, Grunberg–Nissan, and Andrade/DIPPR. The changes in the ηexp of solvent mixtures rather than in the pure fluids, or deviations from ηcal, have been discussed in terms of the molecular interactions and structural effects due to the component molecules. Furthermore, the quantum chemical density-functional theory calculations were used to predict the optimized geometry and total energies of the pure fluids and their binary mixtures.