Alberto Camacho

Thermophysical properties for the ternary systems toluene (1) + benzene (2) + methyl acetate (3), at various temperatures from 288.15 K to 318.15 K

Density, speed of sound and viscosity for the ternary system formed by toluene, benzene and methyl acetate and their corresponding binaries were measured at atmospheric pressure in the temperature range of 288.15 K to 318.15 K, every 5 K. Experimental data were used to calculate derived properties: excess molar volume, isentropic compressibility, isentropic compressibility deviation, viscosity deviation and excess free energy of activation for viscous flow. These magnitudes were fitted to different equations available in the literature. In addition, geometrical models have been used to predict ternary magnitudes. Predictions of viscosities for the ternary system were performed by group contribution models. Molecular interactions among the components of the mixtures were inferred from the sign of the excess and deviation properties.

Volumetric and viscous behaviour of the binary and ternary systems formed by methyl acetate, ethyl acetate and 1-propanol at 283.15, 298.15 and 313.15 K

Experimental data of density and viscosity of the binary and ternary systems formed by methyl acetate, ethyl acetate and 1-propanol are reported here, in the whole range of concentration, at atmospheric pressure and 283.15, 298.15 and 313.15 K. Deviation of viscosity, excess molar volume, thermal expansivity coefficient, excess thermal expansivity coefficient and excess Gibbs energy of activation for viscous flow were calculated from the values of viscosity and density. The results for the binary systems were adjusted to the Redlich–Kister expansion. Cibulka expression was used to adjust ternary system properties. Estimated values of the properties for the ternary system using symmetric geometrical models were compared with experimental results. Katti–Chaudrhi model was applied to evaluate the viscosities of the mixtures and compared with experimental values.

Viscometric and volumetric properties of benzene + methyl acetate, or + methyl propanoate, or + methyl butanoate binary systems at 283.15, 298.15 and 313.15 K

Viscosities and densities of three binary liquid mixtures, benzene + methyl acetate, benzene + methyl propanoate and benzene + methyl butanoate, have been measured at 283.15, 298.15 and 313.15 K, and atmospheric pressure. From experimental data, viscosity deviation, excess energy of activation for viscous flow, and excess molar volume were calculated and satisfactorily correlated with Redlich and Kister equation. Empirical and semiempirical equations and the predicted group-contribution method, universal automatic computer, were applied.

Volumetric and viscosity properties of {propyl propanoate (1) + heptane (or octane) (2)} mixtures at several temperatures and correlation with the Jouyban–Acree model

ABSTRACT Densities and viscosities of binary liquid mixtures of propyl propanoate + heptane and propyl propanoate + octane at temperatures of 278.15, 283.15, 288.15, 293.15, 298.15, 303.15, 308.15, 313.15, 318.15 and 323.15 K have been measured at atmospheric pressure over the entire range of composition. Using these experimental data, the excess molar volumes and the viscosity deviation have been calculated. The experimental data of density and viscosity at different investigated temperatures were mathematically represented by the Jouyban–Acree model. The mean relative deviation (MRD) was used as an error criterion, and the MRD values for data correlation of density and viscosity at different investigated temperatures are less than 0.03% and 0.50%, respectively. Excess molar volumes and viscosity deviations were correlated with Redlich–Kister equation. The calculated data point out the absence of specific interactions between the molecules of different components, which would be slightly weaker compared to the interactions in the pure components.