Study on PVA/PAN pervaporation membrane for the separation of ethyl acetate-ethanol-water system

PAN ultrafiltration membrane was prepared via phase inversion on the plate membrane machine.PVA solution was coated on PAN membrane and crosslinked using TAC as crosslinking agent to prepare PAN-PVA composite membrane.The ATR-FTIR spectra and SEM were carried out to analyze the surface chemical composition and morphology of the composite membranes.The effects of crosslinking agent content as well as feed temperature on PVA/PAN membrane performance were also studied on the pervaporation of ethyl acetate-ethanol-water.The experimental results showed that under the identical temperature,as crosslinking agent content increased,swell reduced as well as the pervaporation flux,but the selectivity increased;and as the increase of feed temperature,the pervaporation flux increased while the selectivity reduced.The composite membranes operated at 30～50 ℃ had a total flux of 30～150 g/(m2·h) with a high selectivity between 480 and 29 000.