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New technique for determination of diffusivities of volatile hydrocarbons in semi-solid bitumen

✍ Scribed by Bernard C.H. Fu; Colin R. Phillips

Publisher
Elsevier Science
Year
1979
Tongue
English
Weight
389 KB
Volume
58
Category
Article
ISSN
0016-2361

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✦ Synopsis

The diffusivities of volatile hydrocarbons in semi-solid Athabasca bitumen were determined by a technique which involves diffusion of hydrocarbon from a bitumen-hydrocarbon solution into a flowing stream of nitrogen. The diffusion method developed is new and can be used for the determination of the diffusivity of any volatile solute in any semi-solid or viscous liquid. For the hydrocarbon solutes tested, the diffusivity was found to decrease with increased molecular weight and the presence of branching and cyclic rings. The presence of branching and ring-shaped structures was more significant in reducing the diffusivity than increase in molecular weight. Results can be explained by Eyring's 'hole' theory of diffusion.

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