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TitleMeasurement and correlation of packed-bed axial dispersion coefficients in supercritical carbon dioxide
Publication TypeJournal Article
Year of Publication1996
AuthorsCatchpole, O.J., Bernig R., and King M.B.
JournalIndustrial and Engineering Chemistry Research
Pagination824 - 828
Date Published1996
ISSN08885885 (ISSN)
KeywordsAxial dispersion, Boundary conditions, Carbon dioxide, Correlation methods, Differential equations, Dispersions, Flow measurement, MATHEMATICAL MODELS, Packed beds, Peclet numbers, Pressure effects, Reynolds number, Solvents, Supercritical carbon dioxide, Thermal effects
AbstractAxial dispersion coefficients of squalene, benzoic acid, and oleic acid were measured in packed beds using supercritical carbon dioxide as a solvent over the temperature range 313-333 K, pressure range 100-300 bar, and Reynolds number range 2-80. Measurements were performed under both horizontal and vertical flow conditions, using a variety of particle sizes, bed diameters, and bed lengths. The axial Peclet numbers obtained for small particles (<1 mm diameter) were an order of magnitude lower than literature data for gases and liquids at ambient pressures. The dimensionless correlation 1/Pe = 0.018/Re + 10/(1 + 0.7/Re) was found to correlate the data within experimental error. The dispersion coefficients for large particles (>1 mm) could be satisfactorially predicted by literature correlations.

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