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A new technique to prepare ultra thin laminate of CA on cellulose membrane (cellophane) for reverse osmosis was exploited by use of surface tension of water film formed on the swollen cellophane. Droplets of acetone or methyl acetate (conditioning solvent) were spread on the swollen cellophane, and CA solution with the same solvent was spread on it simultaneously. By this operation, the ultra thin and antipeeling laminate of CA was formed on cellophane. The mechanism of this lamination is explained as follows. Substitution of water in swollen cellophane by the foregoing solvent facilitates the anchoring of CA in the membrane to form thin laminate. The rejection of glucose by this laminate from its aqueous solution was about 60%.

A TECHNIQUE TO PREPARE ULTRA THIN CELLULOSE ACETATE-CELLULOSE LAMINATED MEMBRANE FOR THE REVERSE OSMOSIS