Organic fluid permeation through fluoropolymer membranes
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United States of America Patent
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Jul 14, 2015
Grant Date -
Apr 26, 2012
app pub date -
Oct 24, 2011
filing date -
Oct 25, 2010
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Abstract
Separation of the components of liquid mixtures is achieved by contacting a liquid mixture with a nonporous membrane having a fluoropolymer selectively permeable layer and imposing a pressure gradient across the membrane from feed side to permeate side. Unusually high transmembrane flux is obtained when the membrane is subjected to one or more process conditions prior to separation. These include (a) leaving some residual amount of membrane casting solvent in the membrane, and (b) contacting the membrane with a component of the mixture to be separated for a duration effective to saturate the membrane with the component.
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