Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Infinite dilution diffusion coefficients of aromatic compounds (benzene, toluene, chlorobenzene, ethylbenzene, p-chlorotoluene, naphthalene, pyrene, and perylene) in mixtures of hexane + heptane and of benzene in polar mixtures (hexane + ethanol and acetone + ethanol) were measured at 298.15 K by the Taylor dispersion technique. Experimental data were correlated by means of literature models depending in most cases on the diffusion coefficient D1p yen of the solute at infinite dilution in the pure solvent. It is shown that the use of experimental values for D1p yen should always be preferred to the Wilke-Chang predictions, especially in the case of nonideal mixed solvents. All models provide equivalent predictions except the Maxwell-Stefan and Dullien-Asfour equations, which lead to less stable results.