Reverse osmosis membrane of cellulosic material
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United States of America Patent
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Mar 21, 1989
Grant Date -
N/A
app pub date -
Sep 1, 1988
filing date -
Oct 5, 1987
priority date (Note) -
Expired
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Abstract
There is provided a method of manufacturing cellulose membranes with pore radii less than 30.times.10.sup.-10 m, suitable for reverse osmosis applications. The method comprises dissolving a cellulosic material in a DMSO/PF solvent at a temperature about 125.degree. C. for about 90 min., cooling and casting the solution at room temperature, evaporating the solvent at a temperature of 140.degree.-180.degree. C. and gelling the resulting membrane in a protic solvent, e.g. ethanol or water.
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