PREPARATION AND POROSITY OF CELLULOSE TRIACETATE REVERSE-OSMOSIS MEMBRANES

Good cellulose triacetate reverse osmosis membranes have been prepared by the phase separation technique. The membrane properties were influ enced by the membrane casting dope composition, mostly by the dioxane/ acetone ratio and the maleic acid content in the casting dope. The dis tinctive membrane performances were caused by different pore size dist ributions and various numbers of pores in the membranes skin. The impr oved pore size distribution analysis and the calculation of both the e ffective number of pores and the active part of the membranes surface area have shown a wide spectrum of the network pore sizes and usually one size group of bigger aggregate pores.