Ana Gayol

Ultrasonic velocity measurements for the ternary mixtures chlorobenzene + n-hexane + linear aliphatic alkane (C7–C8) at 298.15 K

The ultrasonic velocity of the ternary mixtures chlorobenzene + n-hexane + (n-heptane or n-octane) at 298.15 K and atmospheric pressure, has been measured over the whole concentration range. The corresponding change of isentropic compressibility was computed from the experimental data. The results were fitted by means of the Nagata equation, such parameters being gathered. The experimental ultrasonic velocities have been analyzed by theoretical procedures, an adequate agreement between the experimental and theoretical values both in magnitude and sign being obtained, despite the high nonideal trend of mixtures.

Changes of refractive indices of the ternary mixtures chlorobenzene + n-hexane + (n-nonane or n-decane) at 298.15 K

The measures of the refractive indices of the ternary mixtures chlorobenzene + n-hexane + (n-nonane or n-decane) have been done at 298.15 K and atmospheric pressure in the whole composition diagram. The composition dependence of the derived magnitude has been compared with the data obtained with several theoretical models. Attending to the accurate results of these models, the equation of state enclosing mixing rules are pointed out as simple procedures for a multicomponent estimation of refractive indices, the corresponding binary parameters could be used to other thermophysical studies.The measures of the refractive indices of the ternary mixtures chlorobenzene + n-hexane + (n-nonane or n-decane) have been done at 298.15 K and atmospheric pressure in the whole composition diagram. The composition dependence of the derived magnitude has been compared with the data obtained with several theoretical models. Attending to the accurate results of these models, the equation of state enclosing mixing rules are pointed out as simple procedures for a multicomponent estimation of refractive indices, the corresponding binary parameters could be used to other thermophysical studies.

Temperature dependence of thermophysical properties of ethanol + n-hexane + n-heptane

This present article shows the analysis of different physico-chemical properties (density,speed of sound and refractive index) and excess properties (excess volume, excess isentropic compressibility and refractive index deviation) and the temperature dependence of the ternary mixture ethanol + n-hexane + n-heptane in the range 288.15–323.15 K and at atmospheric pressure. The derived properties were computed from the experimental data and were fitted to the Cibulka equation.

Effect of temperature on thermophysical properties of chlorobenzene + linear aliphatic alkanes (C6–C8)

This article reports experimental values of speeds of sound, densities and refractive indices of mixing of the binary mixtures chlorobenzene + (hexane, heptane, octane) at 288.15 K and 308.15 K and atmospheric condition. The corresponding derived properties were computed from the experimental data. Parameters of analytical expressions which represent the composition dependences of the derived properties are reported. Values of physical properties were compared with the results obtained by different prediction methods. The effect of temperature on the mixing is analysed in terms of the relative length of the alkyl chain.

Temperature dependence of the properties of ternary systems ethanol + water + an aliphatic alkane (C6-C9)

ABSTRACT The measures and calculation of different properties such as refractive index, density, speed of sound, excess molar volume, and isentropic compressibility of the ternary heterogeneous compounds by ethanol + water + (n-hexane, n-heptane, n-octane, n-nonane) have been performed in the range 288.15–323.15 K and atmospheric pressure. Attending to the accurate results of these models, the equation of state enclosing mixing rules is indicated as a simple estimation of the procedures of these properties for this kind of multicomponent systems.

Isentropic compressibilities of the mixture chlorobenzene + n-hexane + (n-heptane or n-octane) at 298.15 K

In this work, the applicability of the free length and the collision factor theories (FLT and CFT, respectively) to predict multicomponent changes of isentropic compressibilities is analysed and compared. To this end, appropiate expansions for ternary mixtures were derived from the original works, and then applied to a mixture containing unlike compounds in terms of functional molecular groups. Experimental data of excess molar volumes from open literature and new experimental isentropic compressibilities of the mixture chlorobenzene + n-hexane + (n-heptane or n-octane) were used to compute the parameters. A good accuracy was obtained when ternary prediction is attempted in this partially soluble mixture at different temperatures by the collision factor theory. These results show the versatility of this model for estimation in complex multicomponent mixtures with phases splitting.