Liquid purification or separation – Filter – Material
Patent
1997-07-01
1999-06-22
Walker, W. L.
Liquid purification or separation
Filter
Material
210490, 21050023, 21050027, 21050042, 4283157, 264 41, 264 48, 264 49, 427244, 427245, B01D 3900
Patent
active
059140399
ABSTRACT:
A filtration membrane for micro- or ultra-filtration is formed from a complex of PVDF and calcined .alpha.-alumina (".alpha.-Al") particles, in which complex the particles are reacted and dispersed. The suspended complex is then mixed with a hydrophilic polymer such as polyvinyl alcohol (40%-90% hydrolyzed) referred to herein as HPVA, which reacts with the complex imparting hydrophilicity to the polymer. The novel membrane provides about 50% higher specific flux than a membrane made with the same polymer but without the .alpha.-Al particles. Unexpectedly, the net flux is improved by treating the membrane with a solution of sodium hypochlorite which fails to remove the HPVA from the novel membrane but does remove it from the prior art membrane which does not contain the .alpha.-Al. The preferred membrane comprises a macroporous support coated on its outer surface with a thin tubular asymmetric semipermeable film of polymer containing less than about 50% by is weight of .alpha.-A1 particles.
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Bai Jinhua
Goodboy Kenneth Paul
Mahendran Mailvaganam
Lobo Alfred D.
Walker W. L.
Ward Richard W.
Zenon Environmental Inc.
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