Density, Viscosities, and Excess Properties for Binary Mixtures of Sulfolane plus Alcohols and Sulfolane plus Glycols at Different Temperatures

Sulfolane, alcohols, and glycols are commonly used as solvents in different industrial recovery processes. The focus of the present work is to measure volumetric (densities, rho) and transport (dynamic viscosity, eta) properties of the binary mixtures sulfolane + 2-butanol (or 2-propanol, diethylene glycol, or triethylene glycol) within a temperature range from T = 303.15 K to T = 343.15 K, at atmospheric pressure. Densities and viscosities were measured using a viscodensimeter (Anton Paar SVM 3000 Digital Oscillation U-tube). The experimental results of density and viscosity for both pure and binary systems show a decrease with increasing temperature, as expected for liquids. Excess volumes and viscosity deviations were obtained from the experimental data and fit using a Redlich-Kister type equation. V-E values show a dual behavior, presenting positive and negative data, depending on the nature of the liquid mixtures, whereas Delta eta values are negative in the whole composition range in all systems studied. Thermal expansion coefficients were calculated using the experimental data, assuming positive and negative values.