Semipermeable encapsulated membranes, process for their...

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

B - Operations, Transporting

01

D

117/88.5

B01D 67/00 (2006.01) B01D 69/12 (2006.01) B01D 71/60 (2006.01)

Patent

CA 1227975

Abstract Semipermeable membranes of a porous polymeric substrate whose external and all internal surfaces (pores) are encapsulated by a semi- permeable 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.

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