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ISSN 961-91393-0-5
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 Year 1997
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606 pages
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Volume price - $192.00
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Experiments on Phase Inversion in Aqueous Two-Phase Systems
Jose C. Merchuk
Department of Chemical Engineering and Unit of Biotechnology, Ben-Gurion University of the Negev, Beer Sheva, Israel
ABSTRACT
Phase equilibrium studies were done with the PEG 400-Phosphate system, obtaining equilibrium binodal lines, tie lines and phase inversion points. A method of calculation of the critical point on the binodal curve is described.
The rate of phase separation can be used as an indication of which of the phases is continuous. Using this method the phase inversion point can be determined in the system for each tie line. A range of ambiguity was found, where the continuity of the phases is affected not only by the composition of the mixture, but also by the fluid dynamics. Within this range, gentle agitation produces a bottom-continuous suspension, while strong agitation produces a top-continuous suspension. Two inversion points exist therefore on each tie line, delimiting on the phase equilibrium plane a region where the phase continuity depends on fluid dynamics. The convergence of this region towards the critical point can be used to control of the consistency of the experimental data.
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