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TitleMeasurement and correlation of binary diffusion coefficients in near critical fluids
Publication TypeJournal Article
Year of Publication1994
AuthorsCatchpole, O.J., and King M.B.
JournalIndustrial and Engineering Chemistry Research
Pagination1828 - 1837
Date Published1994
ISSN08885885 (ISSN)
KeywordsBenzoic acid, Binary diffusion coefficients, Carbon dioxide, Carboxylic acids, Correlation methods, Critical volume, Diffusion, Esters, Fatty Acids, Glycerol trioleate, Lipids, Molecular weight, Near critical fluids, Oleic acid, Parameter estimation, Phase equilibria, Solvent extraction, Temperature, Tocopherol
AbstractThe binary diffusion coefficients of benzoic acid, oleic acid, α-tocopherol, and glycerol trioleate were measured in near critical carbon dioxide over the temperature range 298-318 K and pressure range 71-251 bar. A correlation based on an extensive literature database was developed which can be used to estimate both self and binary diffusion coefficients in a range of near critical solvents over the solvent reduced density range 1-2.5, with an average error of ±10%. The correlation is not suitable for estimating binary diffusion coefficients at the binary mixture critical point. The only input data required for the correlation are the solvent molecular weight, reduced temperature, and density, the solute molecular weight, and an estimate of the solute critical volume. © 1994 American Chemical Society.

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