The pervaporation behavior of polyvinyl alcohol(PVA)membrane in low w(ethanol)(w＜5％)solution was investigated by changing the conditions of w(ethanol),temperature,and post membrane vacuum degree.The experimental results show that the permeation flux increases with the increase of w(ethanol),while the separation factor shows a downward trend,reaching a critical value of 3％.The permeation flux shows an increasing trend with the increase of temperature,while the separation factor shows a decreasing trend,reaching a critical value of 50 ℃.The permeation flux shows an increasing trend with the increase of vacuum degree after the membrane,while the separation factor shows a decreasing trend.The conclusions have a certain guiding effect on the permeation and vaporization behavior of PVA membranes.
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