Cationically charge-modified membranes

Details Cationically charge-modified membranes Cationically charge-modified membranes

1997-07-08

2000-04-04

Fortuna, Ana

Liquid purification or separation

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Material

21050027, 21050038, 21050042, 21050041, 21050035, 21050036, 264 41, 264 48, 264 49, B01D 2900

Patent

active

060456949

ABSTRACT:
The present invention relates to cationically charge-modified membranes and methods of preparing such membranes. In one major aspect of the invention, the membranes are hydrophobic membranes that are treated with one or more polymeric wetting agents to render the membranes substantially hydrophilic, followed by treatment with one or more charge-modifying agents, the agents causing the membranes to possess a fixed formal positive charge. In another major aspect of the invention, a cationic membrane is formed from casting in a film a mixed polymer solution comprising a sulfone polymer and a copolymer of vinylpyrrolidone and a cationic imidazolinium compound, and quenching the film in an aqueous bath to produce a coagulated membrane. The membrane can be further cationically charge-modified with one or more charge-modifying agents.

REFERENCES:
patent: 4012324 (1977-03-01), Gregro
patent: 4629563 (1986-12-01), Wrasidlo
patent: 4673504 (1987-06-01), Ostreicher et al.
patent: 4737291 (1988-04-01), Barnes, Jr. et al.
patent: 4743418 (1988-05-01), Barnes, Jr. et al.
patent: 4797187 (1989-01-01), Davis et al.
patent: 4839203 (1989-06-01), Davis et al.
patent: 5004543 (1991-04-01), Pluskal et al.
patent: 5024765 (1991-06-01), Linder et al.
patent: 5098569 (1992-03-01), Stedronsky
patent: 5137633 (1992-08-01), Wang
patent: 5151189 (1992-09-01), Hu et al.
patent: 5269931 (1993-12-01), Hu et al.
patent: 5282971 (1994-02-01), Degen et al.
patent: 5462667 (1995-10-01), Wollinsky et al.
patent: 5462867 (1995-10-01), Azad et al.
patent: 5464538 (1995-11-01), Schmidt et al.
patent: 5503746 (1996-04-01), Gagnon
patent: 5531893 (1996-07-01), Hu et al.
patent: 5543054 (1996-08-01), Charkoudian et al.
patent: 5633300 (1997-05-01), Dasgupta

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