Dehydration of light oil by pervaporation using poly(vinyl alcohol)-poly(acrylic acid-co-maleic acid) membranes

摘要

A new blended membrane was prepared and tested by pervaporation of light oil, a mixture of five alcohols plus water. The blended membrane was synthesized by blending poly(vinyl alcohol) and poly(acrylic acid-co-maleic acid) sodium salt in the presence of sulfuric acid to dope the reaction. We tested several membranes in order to choose the adequate composition to have the best permselectivity. The PVA(60)-PAA-co-maleic acid(40) membrane was selected as it was found to be highly selective. Sorption experiments were performed using binary and ternary water-alcohol solutions. The influence of temperature and feed composition on the selectivity and flux in pervaporation was investigated for two different binary mixtures (water/ethanol, water/isobutanol) and one ternary system (water/ethanol/isobutanol). This membrane presents good permselective properties, high water flux, and good selectivity and can even be used for high-water activities The performances of this new membrane were compared to those obtained with the PVA(90)-PAA(10) membrane synthesized recently: The fluxes observed for the water-ethanol separation were of the same order of magnitude but the selectivity was found to be much higher. (C) 2002 Wiley Periodicals, Inc. [References: 9]