Journal
CHEMICAL ENGINEERING SCIENCE
Volume 59, Issue 24, Pages 5725-5734Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2004.06.015
Keywords
Taylor-Couette; extraction; emulsion; membranes; non-Newtonian; stirred tanks
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The use of Taylor-Couette flow for extraction by emulsion liquid membranes has been characterized. In particular, the rate limiting step for the extraction of a weak acid (benzoic) in an aqueous continuous phase to a strong base (NaOH) in the encapsulated internal phase has been attributed to a surfactant resistance. Numerical and analytical solutions are developed to characterize the mass transfer at Biot numbers Bi < 10. It is demonstrated for fixed droplet composition that a single curve exists for all N for the extent of extraction by stretching the time coordinate by a function of the rotation rate proportional to N-1.2 that is proportional to the globule external area per unit total volume. Moreover, the leakage rate is shown to increase as t(0.6) and to be proportional to N-0.75, the Kolmogoroff eddy velocity. Comparison with stirred tank data demonstrates that greater droplet stability exists for Taylor-Couette flow. (C) 2004 Elsevier Ltd. All rights reserved.
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