Pervaporation dehydration of organic liquids using composite membranes based on carboxymethylcellulose

In order to obtain dehydration pervaporation membranes easily available and durable, we prepared carboxymethylcellulose (CMC)/poly(vinyl alcohol) (PVA) composite membranes by casting CMC (Na+)/PVA blended solutions on polyester nonwoven fabrics and then removing the solvent. The permeation rates of the membrane for the water/organic solvent mixture systems at 60 degrees C were in the range 0.40-1.39 kg/m(2) . h and the value of separation factor was between 12 and 911. Furthermore, in order to increase membrane flux and to enhance membrane strength for practical application, we focused on another kind of polymer composite membrane based on CMC-Na+/poly(acrylic acid) (PAA)-K+ type. The CMC/PAA composite membrane appeared that the separation factor was 2210-3010 with a flux of 0.22-0.68 kg/m(2) . h for the 90wt% aqueous ethanol in the range of experimental temperature. The highest value of pervaporation separation index which measns the best pervaporation performance was 1510 kg/m(2) . h for the 90wt% aqueous ethanol at 60(d)egrees C.