Liquid purification or separation – Filter – Material
Reexamination Certificate
2006-02-21
2006-02-21
Walker, W. L. (Department: 1723)
Liquid purification or separation
Filter
Material
C210S500230, C210S500410, C210S654000, C210S490000, C264S048000, C427S245000
Reexamination Certificate
active
07001518
ABSTRACT:
Novel low pressure reverse osmosis and nanofiltration membranes and a process for their preparation are disclosed. Polyamide reverse osmosis membranes are contacted with organic sulfonic acid solutions without the need for additional treatment by a rejection enhancing agent. These membranes provide sodium chloride rejections of greater than 20 percent and water fluxes greater than 15 gallons per square foot per day at a test pressure of 75 psi. Optimally treated membranes when tested similarly on 0.2 percent magnesium sulfate provide rejections greater than 95 percent with water fluxes greater than 15 gallons per square foot per day.
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Gordon & Rees LLP
Hydranautics
Menon K. S.
Walker W. L.
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