Preparation of heat-treated PAN hollow fiber membranes for pervaporation of NMP/H₂O mixtures
2012
Tsai, Hui-An | Chen, Ya-Ling | Lee, Kueir-Rarn | Lai, Juin-Yih
In this study, the dehydration of NMP aqueous solution is achieved through NMP-insoluble PAN hollow fiber membranes by heat-treatment the NMP-soluble PAN hollow fiber membranes for 12h at temperatures higher than 180°C. The pervaporation results of a 30wt% aqueous NMP solution at 25°C through PAN hollow fiber membranes showed that the permeation flux was higher when the temperature in the range of 180–300°C at which the heat treatment occurred was higher, and it was almost constant when the temperature at which the heat treatment occurred was higher than 300°C. As for the water content of permeate, it was all 100wt% water concentration in permeate for the PAN hollow fiber membranes heat-treated in the temperature range from 180 to 360°C. Furthermore, the permeation rate decreased with increasing NMP concentration in the feed solution and increased with increasing feed solution temperature. The activation energy of the aqueous NMP solution permeating through the PAN hollow fiber membrane heat-treated at 300°C was 3.65kcal/mol for a 30wt% NMP concentration in feed mixtures.
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