Liquid densities and refractive indices of binary mixtures for the dimethyl ether of a glycol plus ethanol from T=288.15 K to 318.15 K

Experimental results are reported for densities, p, and refractive indices, n(D), of {(x)CH3(OCH2CH2)(v)OCH3 + (1 - x)C2H5OH} for v = 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, V-E, for the mixtures were derived. Refractive indices were measured using a digital refractometer, and deviations as a function of mole fraction, Deltan(D), were calculated from the experimental data. The excess molar volumes are negative in every case and become more negative as the v of the glycol increases. The deviations in refractive indices are generally positive and increase as the v 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 V-E of the glycols with v = 3 and 4 in ethanol. Values of excess volumes and deviations in refractive indices as a function of composition were fitted to the Redlich-Mster equation.