Polyamide hollow fiber filtration membrane having barrier layer

Details Polyamide hollow fiber filtration membrane having barrier layer Polyamide hollow fiber filtration membrane having barrier layer

1985-09-30

1988-02-02

Sadowski, David

Liquid purification or separation

Filter

Material

21050033, 21050038, B01D 1304

Patent

active

047227958

ABSTRACT:
A filtration membrane is disclosed which has an ultrafiltration rate of between 200.times.10.sup.-4 and 500.times.10.sup.-4 ml/sec..times.cm.sup.2 .times.bar at 20.degree. C. and which is substantially impermeable to albumin of a molecular weight of about 44,000 or greater. A process for producing a filtration membrane is also disclosed in which a polymer solution is extruded with a center liquid under conditions such that the ratio of the volume of polymer solution to the volume of center liquid is within the range of from about 2:1 to about 4:1 to form a membrane extrudate.

REFERENCES:
patent: 4181694 (1980-01-01), Hashino et al.
patent: 4229291 (1980-10-01), Walch et al.
Lefebvre, M. S. et al, "Permeability Parameters . . . ", in Ultrafiltration Membranes and Applications, A. R. Cooper, Editor, Plenum Press, N.Y., 1980, pp. 79-98.

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