Abstract
Diffusive mass transfer is expected to play a key role in existing and proposed solvent-added processes for heavy oil production. Composition–distance profiles arising during free diffusion scale as a function of the joint variable (distance/time^nw). Simple fluids are governed by Fickian diffusion, where nw = 0.5. For nanostructured fluids, the value of nw can be as low as nw = 0.25, known as the single-file limit, but more typically, the value for the exponent falls between these two limits and is composition-dependent. In this work, five published data sets, comprising free diffusion composition profiles for Athabasca bitumen fractions and for Cold Lake bitumen + light hydrocarbons obtained using diverse apparatus, are probed from this perspective. Additional experimental results are provided for Athabasca bitumen + toluene mixtures over the temperature range of 273–313 K, and results from positive and negative control experiments for two well-defined mixtures—(0.25 mass fraction carbon nanotubes + pol...
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