REVERSE OSMOSIS MEMBRANES AND PROCESS FOR THEIR PREPARATION

REVERSE OSMOSIS MEMBRANES AND PROCESS FOR THEIR PREPARATION

An aromatic polyamide reverse osmosis membrane having a density of 0.15-0.30 g/cc with a salt rejection of 95% or more and exhibiting improved flux is disclosed. The membrane is prepared by casting a solution of an aromatic polyamide, partially drying the thereby formed pre-membrane to a polymer con...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: WONG, BERT CARL, TREHU, YVES MICHEL
Format: Patent
Sprache:eng
Schlagworte:
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
TRANSPORTING
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Beschreibung
Zusammenfassung:An aromatic polyamide reverse osmosis membrane having a density of 0.15-0.30 g/cc with a salt rejection of 95% or more and exhibiting improved flux is disclosed. The membrane is prepared by casting a solution of an aromatic polyamide, partially drying the thereby formed pre-membrane to a polymer content of 30 to 50% by weight followed by quenching the pre-membrane with water within 5-10 seconds of leaving the drying step. Optionally, the membrane can be annealed in hot water.