Semipermeable encapsulated membranes, process for their manufact

Details Semipermeable encapsulated membranes, process for their manufact Semipermeable encapsulated membranes, process for their manufact

1986-08-18

1988-10-18

Spear, Frank

Liquid purification or separation

Processes

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

210651, 210654, 210490, 21050038, B01D 1300

Patent

active

047785969

ABSTRACT:
Semipermeable membranes of a porous polymeric substrate whose external and all internal surfaces (pores) are encapsulated by a semipermeable thin film of a hydrophilic polymer are provided. The encapsulating film consists of at least one layer of said polymer which is cross-linked/stabilized by polyfunctional compounds containing at least two functional (reactive) groups. The membrane substrate is optionally pretreated--before the encapsulation step--with polyfunctional compounds. The new membranes can be used in ultrafiltration and reverse osmosis processes. They are solvent-, pressure- and temperature-resistant and show good separation capacities, e.g. for separating organic compounds from salt solutions.

REFERENCES:
patent: 4337154 (1982-06-01), Fukuchi et al.
patent: 4431545 (1984-02-01), Pall et al.
patent: 4473475 (1984-09-01), Barnes, Jr. et al.
patent: 4477634 (1984-10-01), Linder et al.
patent: 4604204 (1986-08-01), Linder et al.

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