Densities, Viscosities, and Refractive Indices for Binary and Ternary Mixtures of Ethanol, 2-Methylpropan-2-ol, and 2,2,4-Trimethylpentane

Abstract

Densities, viscosities, and refractive indices of the ternary system ethanol + 2-methylpropan-2-ol + 2,2,4-trimethylpentane at T = 298.15 K and the binary systems ethanol + 2-methylpropan-2-ol, ethanol + 2,2,4-trimethylpentane, and 2-methylpropan-2-ol + 2,2,4-trimethylpentane were measured at T = (298.15, 308.15, and 318.15) K and atmospheric pressure over the whole composition range. Densities were determined using a vibrating-tube densimeter. Viscosities were measured with an automatic microviscometer based on the rolling ball principle. Refractive indices were measured using a digital Abbe-type refractometer. Excess molar volumes ( V E ), deviations in the viscosity (Δ η ) from the mole fraction average, and deviations in the refractive index (Δ n D ) from the volume fraction average for the mixtures were derived from experimental data. The binary and ternary data of V E, Δ η, and Δ n D were correlated as a function of the mole fraction by using the Redlich−Kister and the Cibulka equations.