Journal of Chemical and Engineering Data, Vol.52, No.1, 126-130, 2007
Diffusion coefficients of aromatic compounds at infinite dilution in binary mixtures at 298.15 K
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 D-1p(infinity) of the solute at infinite dilution in the pure solvent. It is shown that the use of experimental values for D-1p(infinity) 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.