Water softening membranes

Details Water softening membranes Water softening membranes

C - Chemistry, Metallurgy

08

J

18/32, 182/15.3

C08J 9/36 (2006.01) B01D 67/00 (2006.01) C02F 1/44 (2006.01)

Patent

CA 1317713

ABSTRACT A process for making a water softening membrane and a process for using the same is described. The membrane is prepared by treating a polyamide reverse osmosis membrane with a strong mineral acid. Preferably, the membrane is then treated 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 610 liters per square meter per day (15 gallons per square foot per day). 35,018-F

575358

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