Densities, Viscosities, and Correlations for the Ternary System of Ethanol + Methylbenzene + 2-Methyl-2-propanol and Its Binary Subsystems at T = 298.15 and 318.15 K

Abstract

Densities and viscosities of the ternary system (ethanol + methylbenzene + 2-methyl-2-propanol) and its binary subsystems were measured at T = 298.15 and 318.15 K and atmospheric pressure. Densities were determined using a vibrating-tube densimeter. Viscosities were found with an automatic microviscometer based on the rolling ball principle. From the experimental data, the excess molar volumes (VE) and deviations in viscosity (Δη) were derived. The binary VE and Δη data were correlated with the Redlich–Kister equation. The ternary VE and Δη data were fitted to the equation based on Cibulka and the equation of Singh et al., respectively. The values of VE and Δη were used to discuss the nature of mixing behaviors for the mixtures, and leading to these excess values is perhaps due to the complex formation and/or accommodation between molecules. To describe the ternary system, several mixtures with specially designated concentrations of 2-methyl-2-propanol were considered.