Densities, viscosities, refractive indexes, and surface tensions for binary and ternary mixtures of tetrahydofuran, 2-propanol, and 2,2,4-trimethylpentane

Densities, viscosities, refractive indexes, and surface tensions of a ternary system (tetrahydofuran + 2-propanol + 2,2,4-trimethylpentane) at T = 298.15 K and three constituent binary systems at T = (288.15, 298.15, and 308.15) K were measured at atmospheric pressure. Densities were determined using a vibrating-tube densimeter. Viscosities were measured with an automatic microviscometer based on the rolling ball principle. Refractive indexes were measured using a digital Abbe-type refractometer. Surface tensions were determined by the Wilhelmy-plate method. These results were used to calculate excess molar volumes V-E, deviations in the viscosity Delta eta, deviations in the refractive index Delta n(D), and deviations in the surface tension Delta sigma. The calculated quantities of V-E, Delta eta, Delta n(D), and Delta sigma were fitted to variable-degree polynomials. The ternary results were compared with the values estimated by different empirical equations of prediction.