Immobilized liquid membrane

Details Immobilized liquid membrane Immobilized liquid membrane

B - Operations, Transporting

01

D

18/17

B01D 53/22 (2006.01) B01D 61/38 (2006.01)

Patent

CA 1318992

71033-46 ABSTRACT OF THE DISCLOSURE The present invention is a single-ply immobilized liquid membrane comprising an aqueous liquid membrane immobilized within a hydrophobic microporous support, and a method of preparing such an immobilized liquid membrane. The present invention also includes a method of preparing an ultrathin single-ply immobilized liquid membrane, comprising the steps of: (a) contacting a single-ply hydrophobic microporous support with an aqueous solution containing from about 40 to about 95 percent by volume of an exchange component until steady state is achieved; (b) removing said support from said aqueous solution; (c) contacting said support with water until steady state is achieved; (d) removing said support from said water; (e) repeating steps (a) to (d) until a water membrane is immobilized within substantially the entire thickness of said support; and (f) partially reducing the thickness of said membrane immobilized within said support by (i) establishing a moisture partial pressure gradient between at least one surface of said support and a gas in contact with said one surface, and (ii) maintaining said moisture partial pressure gradient for a time sufficient to cause a portion of said liquid membrane to evaporate thereby partially reducing its thickness.

514919

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