Liquid Densities and Refractive Indices of Binary Mixtures for the Dimethyl Ether of a Glycol + Ethanol from T = 288.15 K to 318.15 K

Abstract

Experimental results are reported for densities, ρ, and refractive indices, nD, of {(x)CH3(OCH2CH2)νOCH3 + (1 − x)C2H5OH} for ν = 1−4 at T = (288.15, 298.15, 308.15, and 318.15) K and atmospheric pressure over the entire mole fraction range. Densities were measured with a vibrating-tube densimeter, and excess volumes molar volumes, VE, for the mixtures were derived. Refractive indices were measured using a digital refractometer, and deviations as a function of mole fraction, ΔnD, were calculated from the experimental data. The excess molar volumes are negative in every case and become more negative as the ν of the glycol increases. The deviations in refractive indices are generally positive and increase as the ν of the glycol increases. Excess molar volumes increase as the temperature increases, while deviations in refractive indices decrease as the temperature increases. The temperature has no significant effect on VE of the glycols with ν = 3 and 4 in ethanol. Values of excess volumes and deviations in ...