Abstract
The evaluation methods of pervaporation performance were studied using direct measurement of permeate vapor by gas chromatography (direct gas chromatographic method) and cold trap of permeate vapor (cold trap method).The membrane performances of ethanol-water separation were compared by two method above mentioned. As the results, it was found that the separation factor of ethanol to water in the EtOH-H2O pervaporation through poly (dimethylsiloxane) [poly (DMS)] and styrene-DMS graft copolymer membranes by direct gas chromatographic method became larger than by cold trap method and the permeate rate became smaller than by cold trap method, especially in the case that the sampling tube of permeate vapor was small. It is confirmed that these results are caused by the increase of permeate side pressure and condensation of water rather than ethanol, because the condensation temperature of water is lower than that of ethanol.
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