Method of treating polyamide membranes to increase flux

Details Method of treating polyamide membranes to increase flux Method of treating polyamide membranes to increase flux

B - Operations, Transporting

01

D

B01D 71/56 (2006.01) B01D 67/00 (2006.01)

Patent

CA 2243558

The flux of a composite reverse osmosis or nanofiltration membrane having a polyamide discriminating layer is enhanced in a one-step process in which the discriminating layer is treated with ammonia or certain alkylamines. It is possible to control both rejection rate and flux of the membrane as well as convert reverse osmosis membranes into nanofiltration membranes.

Le débit d'une membrane composite d'osmose inverse ou de nanofiltration, pourvue d'un couche sélective polyamide, est accru grâce à un procédé en une seule étape, dans le cadre duquel la couche sélective est traitée à l'ammoniaque ou avec certaines alkylamines. Il est possible de maîtriser à la fois le taux de refus et le débit de la membrane, comme de transformer des membranes d'osmose inverse en membranes de nanofiltration.

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