Polyamide membranes useful for water softening
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United States of America Patent
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Aug 23, 1988
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N/A
app pub date -
Apr 28, 1986
filing date -
Apr 28, 1986
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Expired
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Abstract
A novel water softening membrane and process for making the same is described. The membrane can be prepared by treating a polyamide reverse osmosis membrane with a strong mineral acid followed by treatment with a rejection enhancing agent. The resulting membrane at transmembrane pressures of 50 psi can attain a magnesium sulfate rejection with a 0.2 percent aqueous solution of more than 90 percent with a water flux of more than 15 gallons per square foot per day.
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