Membranes of acrylonitrile polymers for ultrafilter and method f

Details Membranes of acrylonitrile polymers for ultrafilter and method f Membranes of acrylonitrile polymers for ultrafilter and method f

1973-04-26

1976-01-20

Spear, Jr., Frank A.

Liquid purification or separation

Filter

Material

264 41, B01D 3100, B01D 1300

Patent

active

039336530

ABSTRACT:
Membranes of acrylonitrile polymers having water-permeability greater than 0.2 ml/cm.sup.2.min.atm and useful as an inexpensive superior ultrafilter, comprising (1) a porous layer or layers existing near and on the surfaces of said membranes, the average sizes of pores contained in said porous layer or layers and existing on each of assumptive parallel planes to the surfaces of said membranes, having such a gradient that said average sizes become smaller toward the surfaces of said membranes, and (2) a reticulate porous layer adjacent to said porous layer or layers (1) and containing therein a succession of voids of cylindrical shape or revolving ellipsoid shape having diameters of 5 - 50.mu. and lengths of at least 10.mu., are prepared by dissolving an acrylonitrile polymer in an aqueous solution of nitric acid of 65 - 95% by weight concentration, casting the resulting solution on a support followed by coagulation in a coagulation bath, or extruding the resulting solution from a slit into a coagulation bath, the coagulation bath being water alone or a nitric acid aqueous solution of 30% by weight or less.

REFERENCES:
patent: 2907096 (1954-10-01), Halbig
patent: 3615024 (1971-10-01), Michaels
patent: 3616607 (1971-11-01), Klass et al.

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