Fluid—solid mass transfer in a supercritical fluid extractor

CFD modeling on external mass transfer and intra-particle diffusional effects on the supercritical hydrogenation of sunflower oil

“…The Sherwood number for the process was also evaluated, and it was found that its value lies between those expected for a gas and those expected for a liquid. Furthermore, the obtained values remain in the magnitude order of those predicted by means of the correlations proposed by Tan et al (1988) for external mass transfer in a supercritical extractor.…”

“…Nevertheless, the obtained numerical data suggest that the particle-to-fluid mass transfer coefficients for the supercritical hydrogenation of sunflower oil lie within the values for a gas (Ranz and Marshall, 1952) and a liquid (Brunner, 1985), which is coherent with the definition of a supercritical fluid. Furthermore, the obtained values remain in the magnitude order of those predicted by means of the correlations proposed by Tan et al (1988) for external mass transfer in a supercritical extractor.…”

Supercritical carbon dioxide extraction of red pepper (Capsicum annuum L.) oleoresin

“…D e was estimated as a function of the binary diffusion coefficient ðD 12 Þ of a relevant solute in SC-CO 2 , which depends only on extraction temperature and pressure, and microstructural features of the solid matrix. Values of k f were estimated using the correlation of Tan, Liang, and Liou (1988) for packed beds operating with SCFs.…”

Kinetics and specificity of Lipozyme-catalysed oil hydrolysis in supercritical CO2

“…Several correlations for external mass transfer in supercritical CO 2 have been derived as a correlation between Sherwood number, Reynolds number and Schmidt number. The correlation published by Tan et al (1988) …”