Some physical properties derived from density, refractive index and viscosity measurements for quaternary system of Cyclohexane with some n-alkanes and alcohols at different temperatures.

الملخص

This study concerned with measurement the densities, ρ, refractive indices, nD,
and viscosities, η, over the range of temperatures 298.15, 308.15, 318.15, and
328.15K for quaternary mixtures cyclohexane+n-heptane+n-decane+n-hexane, and
cyclohexane+1-pentanol+3-hexanol+n-hexane. From experimental data of densities,
refractive indices, and viscosities, the excess molar volumes, VE , excess refractive
indices, nE , and excess viscosities, ηE , were calculated for quaternary mixtures. The
excess function results for these mixtures were observed rocking between positive and
negative deviation from ideality depending on molecular interactions in these
mixtures. The Flory theory has been extended for the theoretical prediction of excess
molar volume of quaternary mixtures studied here depending on the pure component
liquid parameters. .The theory predicted the volumetric behavior and magnitudes of
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V E well. Refractive indices for quaternary mixtures studied in this work can be
predicted by using different refractive indices mixing rules , we found good
agreement between the experimental and the predicted values of the refractive indices
for the quaternary mixtures studied here. In this study Heric-Coursey equation was
used to calculate the excess viscosities for ternary mixtures studied here. The
theoretical results of excess viscosity exert good agreement with the experimental
results of excess viscosity for these mixtures.