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Diffusion of symmetrical and spherical solutes in protic,aprotic, and hydrocarbon solvents
Authors:D Fennell Evans  Toshihiro Tominaga  C Chan
Institution:(1) Department of Chemical Engineering, Carnegie-Mellon University, 15213 Pittsburgh, Pennsylvania
Abstract:The diffusion coefficients of a series of symmetrical tetraalkyltins (tetramethyltin, tetraethyltin, tetrapropyltin, tetrabutyltin, tetradodecyltin) of the gases argon, krypton, xenon, methane, and tetramethylmethane and of carbon tetrachloride and tetraethylmethane in hexane, decane, and tetradecane at 25°C have been determined using the Taylor dispersion technique. Diffusion coefficients for the gases in acetone, 2-propanol, 1-butanol, and 1-octanol were also determined. Deviations from the predictions of Stokes' law were found to be large, and the magnitude of the deviation can be directly related to solute size. The predictions of the Hubbard-Onsager equation were tested using the diffusion data.
Keywords:Diffusion  Stokes Law  nonelectrolytes  rare gases  tetraalkyltins  tetraalkylmethanes  carbon tetrachloride  methane  hexane  decane  tetradecane
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