STUDIES ON DESALINATION BY PERVAPORATION

Desalination by pervaporation was investigated, in which an asymmetric membrane with non-porous layer was used. This kind of membrane was prepared from alloy of PVA and PEG crosslinked by aldehydes and sodium salt. The desalination of 3.5% and 8% NaCl solution with the membrane by pervaporation at 55 degrees C and 5.00 kPa(downstream pressure) resulted in the single-stage salt rejection of 99% and the water flux of 14 kg/h . m(2). The concentration of NaCl solution has a bit of effect on seperation properties.