Lelia Mussari

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.

Viscosities for Binary Mixtures of 1-Decanol, Hexane, and Diethylamine at 10, 25, and 40°C

Experimental viscosities provide information on the structure of liquids and are required in the design of processes, which involve fluid flow, mass transfer, or heat transfer calculations. This work reports experimental viscosity data of the binary mixtures: 1-decanol + hexane, 1-decanol + diethylamine, and hexane + diethylamine at 10, 25, and 40°C and atmospheric pressure for the whole range of compositions. The viscosities of the pure liquids and their mixtures were determined using Cannon Fenske viscometers thermostated at ±0.01°C. The estimated error in the measured viscosities was less than ±0.005 mPa-s. The dynamic viscosity and the excess energy of activation for viscous flow were also calculated. The equation of Redlich–Kister was used for fitting the excess properties of the binary mixtures. The excess viscosity shows positive deviations from ideal behavior for the mixtures 1- decanol + hexane and 1-decanol + diethylamine and a small negative deviation for the binary system hexane + diethylamine. The experimental results have been also used to test some empirical and semiempirical equations adopted previously to correlate viscosity composition data.

Volumetric and transport properties of the ternary mixtures of toluene (1) + benzene (2) + butyl acetate (3) at different temperatures

Densities, ρ, speeds of sound, u, and viscosities, η, of ternary mixtures containing toluene, benzene and butyl acetate and binary mixtures formed by toluene and butyl acetate are reported in this paper. From experimental data, excess molar volumes, VE, isentropic compressibilities, κs, and excess isentropic compressibilities, , were evaluated. The calculated magnitudes were fitted to different equations available on the literature, and geometrical models have been used to predict ternary magnitudes from the binary ones. Furthermore, viscosities were predicted by group contribution models. The results have been discussed in terms of molecular interactions among the components of the mixtures.