Semipermeable composite membrane

Details Semipermeable composite membrane Semipermeable composite membrane

1979-09-04

1981-11-24

Spear, Jr., Frank A.

Liquid purification or separation

Processes

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

2105002, 427245, B01D 300, B01D 1300

Patent

active

043023363

ABSTRACT:
A semipermeable composite membrane comprising a thin semipermeable film of a polymeric material deposited on one side of a microporous substrate, said polymeric material being prepared by crosslinking a soluble polymer containing at least 30 mole % of a recurring unit of the formula ##STR1## wherein all symbols are as defined in claim 1, and having at least 0.2 milliequivalent, per gram of said polymer, of an amino group containing 1 or 2 active hydrogen atoms, with a polyfunctional compound containing at least two functional groups capable of reacting with the amino group having 1 or 2 active hydrogen atoms; and a process for preparing the same. The semipermeable composite membrane of this invention is especially useful for desalination of saline or brackish water by reverse osmosis.

REFERENCES:
patent: 3083118 (1963-03-01), Bridgeford
patent: 3133132 (1964-05-01), Loeb et al.
patent: 3133137 (1964-05-01), Loeb et al.
patent: 3723306 (1973-03-01), Bridgeford
patent: 3950257 (1976-04-01), Ishii et al.
patent: 3951815 (1976-04-01), Wrasidlo
patent: 4005012 (1977-01-01), Wrasidlo
patent: 4039440 (1977-08-01), Cadotte
patent: 4177150 (1979-12-01), Inoue et al.

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