Abstract
Recent progress on liquid separations using ionic liquid membranes, such as bulk, emulsion, and supported liquid membranes containing ionic liquids, is briefly reviewed in this chapter. Regarding supported liquid membranes, a number of attempts to improve the membrane stability involving application of ionic liquids to the impregnated liquid have been conducted. Our research relating to lactic and succinic acid permeation through supported ionic liquid membranes and polymer inclusion membranes is reviewed, and permeation mechanism is discussed. In the case of liquid separation, polymer inclusion membranes were found to be an excellent alternative in terms of higher membrane stability and comparable permeation rate, in comparison to supported ionic liquid membranes.
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