Diffusion in supercritical fluids

A quantitative understanding of rate mechanisms such as diffusion is of considerable importance in the design of equipment for, and process development of, supercritical fluid (SCF) extraction. However, there is currently very little available fundamental diffusion data in the supercritical region....

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Bibliographic Details
Published in:The Journal of Supercritical Fluids 1991, Vol.4 (2), p.91-108
Main Authors: Liong, K.K., Wells, P.A., Foster, N.R.
Format: Article
Language:English
Subjects:
diffusion coefficients
experimental techniques
supercritical fluids
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Summary:A quantitative understanding of rate mechanisms such as diffusion is of considerable importance in the design of equipment for, and process development of, supercritical fluid (SCF) extraction. However, there is currently very little available fundamental diffusion data in the supercritical region. This is due, in part, to the sampling difficulties encountered in high pressure systems. The most reliable methods for obtaining diffusivity data in SCF systems have involved the use of non-obtrusive techniques such as solid dissolution, capillary peak broadening, photon correlation spectroscopy, and nuclear magnetic resonance spectroscopy. These techniques, together with the associated advantages and limitations, are discussed. The effects of various solute and solvent parameters on the diffusion coefficient, and the modelling aspects of diffusion behavior in SCFs are also analyzed.
ISSN:0896-8446
1872-8162
DOI:10.1016/0896-8446(91)90037-7