Literature Cited(1) Bernardo-Gil, M. G.; Ribeiro, . A. Fluid Phase Equil., in (2) Bernardo-Gil, M. G.; Ribeiro, . A. Submitted for publication.(3) Handbook of Chemistry and Physics, 57th ed.; Weast, R., Ed.; CRC Press: Cleveland, OH, 1977.
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
of the solute at infinite dilution in the pure solvent. It is shown that the use of experimental values for
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.
The Taylor dispersion technique was used to measure the diffusion coefficients of benzene, chlorobenzene, ethylbenzene, toluene, p-chlorotoluene, naphthalene, pyrene, and perylene at infinite dilution in mixtures of hexane + octane, hexane + decane, heptane + octane, heptane + decane, octane + decane, cyclohexane + hexane, cyclohexane + heptane, cyclohexane + octane, and cyclohexane + decane at 298.15 K. Experimental data were correlated satisfactorily by means of the Leffler-Cullinan equation using the measured values of solutes in the pure solvents and a group contribution method for estimating the viscosity of the solvent mixtures.
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