Method for making high flux, high salt rejection cellulose desalting membranes
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United States of America Patent
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Feb 28, 2012
Grant Date -
Nov 13, 2008
app pub date -
May 9, 2007
filing date -
May 9, 2007
priority date (Note) -
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Abstract
A method is provided for producing a high flux, high salt rejection cellulose acetate desalination membrane. In this method, cellulose acetate polymer is dissolved in a first solvent such as methylene chloride or 2-methyltetrahydrofuran to produce a solution. Further steps involve stirring the solution, and thereafter permitting the solution to settle, for a time sufficient for a majority of the cellulose acetate to precipitate out of the solution to form a cellulose acetate precipitate. Next, the cellulose acetate precipitate is stirred into an excess methanol. Thereafter, the cellulose acetate is filtered out and used in making the desalination membrane.
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