High flux semipermeable membranes which comprise a polymerized reaction product within and/or on a porous supportmay be prepared by contacting the porous support such as a polysulfone sheet with an aqueous solution of a polyamine, saidaqueous solution containing a polar aprotic solvent not reactive with amines and optionally an acid acceptor. The surface of thecoated support is dried to the touch and then contacted with an organic solution of a polycarboxylic acid halide for a period oftime sufficient to form a polymerized reaction product within and/or on the surface of the support material. The resulting composite may be post treated by washing with an alkaline compound. The resultant membrane composite may be used in separationprocesses such as the desalination of brackish or seawater, or the softening of domestic hard water.

Title
Membrane semi-permeable pour flux eleve
High flux semipermeable membranes
Publication Number
2063787
Application Date
July 18, 1990
Publication Date
March 1, 1991
Inventor
Chau Michael M
Agent
GOWLING LAFLEUR HENDERSON
Assignee
Koch Membrane Systems
IPC
B01D 69/12
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