Defect-free ultrahigh flux asymmetric membranes

Details Defect-free ultrahigh flux asymmetric membranes Defect-free ultrahigh flux asymmetric membranes

1988-12-06

1990-02-20

Spear, Frank

Liquid purification or separation

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Material

21050029, 21050036, 55 16, 264 41, B01D 1300

Patent

active

049024221

ABSTRACT:
Defect-free, ultrahigh flux integrally-skinned asymmetric membranes having extremely thin surface layers (<0.2 .mu.m) comprised of glassy polymers are disclosed. The membranes are formed by casting an appropriate drope followed by forced convective evaporation of solvent to obtain a dry phase separated asymmetrical structure. The structure is then washed in a precipitation liquid and dried.

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