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 EN

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–heptanes + 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 1234 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.