Abstract
Crosslinked poly(vinyl alcohol) membranes were prepared and used for pervaporation of acetic acid-water mixture. Water was preferentially permeated through the membranes. The permeate flux and the separation factor of the membranes were strongly influenced by the crosslinking conditions, such as crosslinking time, type of solvents, or catalysts. In the dehydration of 70wt.% acetic acid, high fluxes of 0.240-0.724kg/m2h with separation factors of 7.1-11.8 were obtained by crosslinking reaction using an aqueous Na2SO4 as a solvent and H2SO4 as a catalyst with a crosslinking time of maximum 6h. Higher separation factors of 13.2-140 with fluxes of 0.05-0.238kg/m2h were achieved using acetone or ethanol as a solvent and HCl as a catalyst with a crosslinking time of 6-48h.
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