CHARACTERISTICS OF POROUS CELLULOSE ACETATE MEMBRANES FOR THE SEPARATION OF SOME INORGANIC SALTS IN AQUEOUS SOLUTION,
NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF APPLIED CHEMISTRY
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Experimental results are presented to illustrate the effect of operating variables on the separation and flow characteristics of porous cellulose acetate membranes. The results are discussed from the point of view of the preferential sorption and capillary flow mechanism, together with the concept of related and unrelated solution systems. It was found that under identical experimental conditions of constant molality of feed solution, feed flow rate, operating pressure and temperature, the separation and flow characteristics of the membranes are uniquely related for all solution systems containing monovalent or bivalent cations and anions of the same respective valency. These relations can be expressed by a system of experimentally determined characteristic curves which can then be used to predict the performance of any similar membrane. The general form of these curves representing the relative separation data for aqueous solutions containing ions of the same valency has given rise to the concept of related feed solution systems.