Stabilization of Cellulosic Desalination Membranes by Crosslinking
C. E. Reid and coworkers discovered that, among many polymers, cellulose acetate exhibits an exceptionally selective permeability toward water in salt solutions under conditions of reverse osmosis. Subsequently, Loeb and Sourirajan developed a method of fabrication for water-swollen cellulose acetate membranes with greatly increased flux rates but which retain much of the selectivity (“salt rejection”) of ordinary films. The practicality of the so-called asymmetric membranes of this type is now established by their use in commercial reverse osmosis desalination equipment. Further increases in water flux, however, are highly desirable in order to reduce the cost of the reverse osmosis process. The preparation of membranes with both increased flux and improved flux stability was the object of the work described herein.
KeywordsActive Layer Cellulose Acetate Reverse Osmosis Casting Solution Sodium Bisulfite
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