| 摘要 |
<p>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-bromoamine or N-chloramine. A method of making the membrane and its use in separating a variety of solutes from water are also described.</p> |
