Process for the preparation of surface modified, multilayered, c

Details Process for the preparation of surface modified, multilayered, c Process for the preparation of surface modified, multilayered, c

1990-08-29

1991-10-29

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

55 16, 21050041, B01D 5322, B01D 7168

Patent

active

050613014

ABSTRACT:
A process for the preparation of surface modified, multilayered, composite membranes are disclosed. This process comprises the steps of: subjecting the surface of porous polysulfone membranes to sulfonation to introduce sulfonic acid functional groups onto the surface of the membranes; and either subjecting the sulfonic acid functional groups so introduced to silylation with reactive polysiloxanes to undergo grafting the polysiloxanes on the introduced functional groups, followed by applying polysiloxanes coating along with cross-linking agent onto so treated membranes to allow to undergo cross-linking; or carrying out both the silylation step and the coating and cross-linking step simultaneously.
The membranes so produced are useful in gas separation systems for oxygen enrichment of air.

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