Liquid purification or separation – Filter – Supported – shaped or superimposed formed mediums
Reexamination Certificate
2005-01-04
2005-01-04
Sorkin, David L. (Department: 1723)
Liquid purification or separation
Filter
Supported, shaped or superimposed formed mediums
C210S500330, C210S500380, C210S506000
Reexamination Certificate
active
06837381
ABSTRACT:
The present invention provides a composite reverse osmosis membrane as a polyamide membrane including a side chain amino group such as a residue of a polyvinyl alcohol-based amine compound represented by Formula 1. Such a membrane can remove organic impurities under a low pressure, providing an economical method for removal of impurities. An aqueous solution including a polyvinyl alcohol-based amine compound having a side chain amino group represented by Formula 1 is applied on a polysulfone-based ultrafiltration membrane as a microporous support. Next, trimesic acid chloride solution is applied causing interfacial polycondensation, which generates a reverse osmosis membrane. When this composite reverse osmosis membrane is evaluated by using a pH 6.5 aqueous solution including 500 mg/l of sodium chloride at an operation pressure of 5 kg/cm2and at a temperature of 25° C., the permeable flux is at least 1.5 m3/m2·d, and the salt rejection is 80% or less.wherein 0<a, 0≦b, 2<c, 1≦x≦5, 0≦y≦4; R1is at least one group selected from the group consisting of an ether group, an alkylene group and an ester group; and R2is at least one group selected from the group consisting of an alkyl group and a halogen group.
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Nitto Denko Corporation
Osha & May L.L.P.
Sorkin David L.
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