Composite membrane for reverse osmosis

Liquid purification or separation – Filter – Supported – shaped or superimposed formed mediums

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Details

21050023, 264 41, B01D 1300

Patent

active

047723912

ABSTRACT:
A composite lumen-side feed reverse osmosis membrane and its preparation are disclosed, the membrane comprising a polymeric microporous-walled hollow fiber support with an interfacially-polymerized ultrathin semipermeable salt-rejecting layer engrafted on the lumen or bore of the hollow fiber support, the support having walls that are substantially completely free of finger-like voids in excess of about 5 microns in the area of the wall adjacent the lumen. The preparation of the support comprises coaxially spin-casting (1) a fiber-forming solution containing a pore-forming material with (2) a lumen-forming fluid comprising from about 50 to about 70 vol % organic solvent in water.

REFERENCES:
patent: 3615024 (1971-10-01), Michaels
patent: 3691068 (1972-09-01), Cross
patent: 4039440 (1977-08-01), Cadotte
patent: 4230463 (1980-10-01), Henus et al.

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