Abstract: A novel organic dehydration membrane with interface crosslink structure consisting of aminated PANmicroporous membrane as sublayer, sodium alginate coating as top layer and intermolecular crosslinking as middle layer has been prepared and characterized by pervaporation experiment. The influence of hydrolysis time of PANmicroporous membrane, the kinds and concentration of diamine used for amination of the microporous support layer on selectivity and flux was studied and it was shown that the amination of the sublayer with 1,6-hexanediamine(HDM) gave higher pervaporation performance of the composite membrane than that with ethylenediamine(EDM). This novel composite membrane prepared from the support layer aminated by 20% HDMafter being hydrolyzed for 2 h has a high separation factor of 2241 and a good permeation rate of 305 g·m^-2 ·h^-1 for pervaporation of 90% ethanol aqueous solution at 70 ℃, higher separation factors and fluxes for n-PrOH/water, i-PrOH/water, acetone/water and dioxane/water systems. The results show that the separation factor and flux of this membrane increase with raising the operating temperature. At the same time, SEMmicrograps show that hydrolysis and amination of PANmicroporous membrane change its pore structure. From the results it can be concluded that pore structure of the sublayer do make influence of the separation properties of the novel composite membrane.

Key words: Pervaporation, Composite membrane, Separation for alcohol-water mixture, Sodium alginate