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Title: Supercritical fluid reverse micelle separation

A method of separating solute material from a polar fluid in a first polar fluid phase is provided. The method comprises combining a polar fluid, a second fluid that is a gas at standard temperature and pressure and has a critical density, and a surfactant. The solute material is dissolved in the polar fluid to define the first polar fluid phase. The combined polar and second fluids, surfactant, and solute material dissolved in the polar fluid is maintained under near critical or supercritical temperature and pressure conditions such that the density of the second fluid exceeds the critical density thereof. In this way, a reverse micelle system defining a reverse micelle solvent is formed which comprises a continuous phase in the second fluid and a plurality of reverse micelles dispersed in the continuous phase. The solute material is dissolved in the polar fluid and is in chemical equilibrium with the reverse micelles. The first polar fluid phase and the continuous phase are immiscible. The reverse micelles each comprise a dynamic aggregate of surfactant molecules surrounding a core of the polar fluid. The reverse micelle solvent has a polar fluid-to-surfactant molar ratio W, which can vary over a range having amore » maximum ratio W.sub.o that determines the maximum size of the reverse micelles. The maximum ratio W.sub.o of the reverse micelle solvent is then varied, and the solute material from the first polar fluid phase is transported into the reverse micelles in the continuous phase at an extraction efficiency determined by the critical or supercritical conditions.« less
Authors:
 [1] ;  [1]
  1. (Richland, WA)
Publication Date:
OSTI Identifier:
869041
Report Number(s):
US 5266205
DOE Contract Number:
AC06-76RL01830
Resource Type:
Patent
Research Org:
BATTELLE MEMORIAL INSTITUTE
Country of Publication:
United States
Language:
English
Subject:
supercritical; fluid; reverse; micelle; separation; method; separating; solute; material; polar; fluid; polar; fluid; phase; provided; method; comprises; combining; polar; fluid; fluid; gas; standard; temperature; pressure; critical; density; surfactant; solute; material; dissolved; polar; fluid; define; polar; fluid; phase; combined; polar; fluids; surfactant; solute; material; dissolved; polar; fluid; maintained; near; critical; supercritical; temperature; pressure; conditions; density; fluid; exceeds; critical; density; reverse; micelle; defining; reverse; micelle; solvent; formed; comprises; continuous; phase; fluid; plurality; reverse; micelles; dispersed; continuous; phase; solute; material; dissolved; polar; fluid; chemical; equilibrium; reverse; micelles; polar; fluid; phase; continuous; phase; immiscible; reverse; micelles; comprise; dynamic; aggregate; surfactant; molecules; surrounding; core; polar; fluid; reverse; micelle; solvent; polar; fluid-to-surfactant; molar; ratio; vary; range; maximum; ratio; determines; maximum; size; reverse; micelles; maximum; ratio; reverse; micelle; solvent; varied; solute; material; polar; fluid; phase; transported; reverse; micelles; continuous; phase; extraction; efficiency; determined; critical; supercritical; conditions; supercritical conditions; standard temperature; pressure conditions; polar fluid; polar fluid; polar fluid; polar fluid; polar fluid; polar fluid; polar fluid; polar fluid; polar fluid; polar fluid; polar fluid; fluid phase; fluid phase; fluid phase; fluid phase; molar ratio; critical temperature; method comprises; supercritical fluid; continuous phase; continuous phase; continuous phase; continuous phase; reverse micelle; reverse micelle; reverse micelle; reverse micelle; reverse micelle; reverse micelle; reverse micelle; reverse micelle; reverse micelle; reverse micelle; critical density; critical density; near critical; method comprise; comprises combining; surfactant molecule; supercritical temperature; separating solute; chemical equilibrium; extraction efficiency; maximum size; fluid reverse; micelle sol; micelle sol; micelle sol /210/530/