Treated composite polyamide membranes to separate...

Details Treated composite polyamide membranes to separate... Treated composite polyamide membranes to separate...

C - Chemistry, Metallurgy

08

J

18/32, 182/15.3

C08J 9/36 (2006.01) B01D 61/02 (2006.01) B01D 67/00 (2006.01)

Patent

CA 2022612

ABSTRACT A reverse osmosis membrane having improved rejection of sulfuric acid and/or isopropanol is described The membrane is prepared by treating a crosslinked, polyamide discriminating layer with a reagent that is amine-reactive or oxidizing such that the passage of sulfuric acid in a 2 percent aqueous solution at a transmembrane pressure of 400 psig (2758 kPa gauge) is reduced by at least 30 percent. The amine reactive reagent is a carboxylic acid ester, a carboxylic acid anhydride, an amine-reactive organic halogen compound, an ethylenically unsaturated hydrocarbon, or a 1,3-propane sultone. The oxidizing reagent is a peroxycarboxylic acid with a mw of less than 300, periodic acid, N-bromomine or N-chloramine. A method of making the membrane and its use in separating a variety of solutes from water are also described. 37,457A-F

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