Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

Densities of ternary liquid mixtures composed of benzene, 2-methoxy-2-methylbutane (i.e. tert-amyl methyl ether, TAME), and 2,2,4-trimethylpentane (i.e. isooctane, 2,2,4-TMP) are measured at three temperatures 298.15 K, 308.15 K, and 318.15 K at atmospheric pressure by a vibrating-tube densimeter as well as all its binary sub-systems. Excess molar volumes of the mixtures are calculated from the experimental densities and then correlated using the Redlich-Kister equation. The determination of its adjustable parameters is made by the method of least squares. For all studied systems, the positive deviations from ideal behavior are observed at all temperatures. The excess molar volume curves of binary systems differ in the shape and temperature dependence. The experimental binary data are compared with literature data and discussed. The ternary system mentioned above is measured newly. Moreover, the experimental excess molar volumes are compared to the calculation using Peng-Robinson equation with a corrected parameter. The novelty of this work is the prediction of ternary excess molar volumes from binary parameters in Peng-Robinson equation.