Semipermeable composite membrane

Details Semipermeable composite membrane Semipermeable composite membrane

1979-10-18

1982-10-12

Spear, Jr., Frank A.

Liquid purification or separation

Processes

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

2105002, 427246, B01D 1300

Patent

active

043538029

ABSTRACT:
A semipermeable composite membrane comprising a thin semipermeable film of a polymeric material deposited on one side of a microporous substrate, the 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 herein, and having at least 0.5 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: 2630429 (1953-03-01), Hwa
patent: 3580841 (1971-05-01), Capotte et al.
patent: 4005012 (1977-01-01), Wrasipio
patent: 4265745 (1981-05-01), Kawaguchi et al.

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