Microporous filter system and process

Details Microporous filter system and process Microporous filter system and process

1982-05-07

1984-02-14

Cintins, Ivars C.

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210650, 2105002, B01D 1300, B01D 3100

Patent

active

044315457

ABSTRACT:
A microporous filter system comprises two types of hydrophilic, microporous filter media operating in series. The two filter media have opposite zeta potentials with the upstream or first filter medium preferably having the positive zeta potential and the downstream or second filter having the negative zeta potential. The first filter medium typically has an absolute pore rating of from about 0.1 to about 1.0 micrometer and the second or downstream filter medium typically has an absolute pore rating of from about 0.02 to about 0.1 micrometer. The downstream or second filter has a finer absolute pore rating than the upstream or first filter. Fluids contaminated with ultrafine particles can be purified with an essentially absolute efficiency to remove 99.99 percent or more of the particulate matter in the contaminated fluid. The filter system finds particular use in the preparation of ultrapure effluent water of near theoretical resistivity and in the removal of bacteria and endotoxins to form sterile fluids.

REFERENCES:
patent: 3132094 (1964-05-01), McKelvey et al.
patent: 4253900 (1981-03-01), Dege et al.
patent: 4288462 (1981-10-01), Hou et al.
patent: 4340479 (1982-07-01), Pall
patent: 4350594 (1982-09-01), Kawai et al.

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