Spray-coated PDMS/PVDF composite membrane for enhanced butanol recovery by pervaporation |
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Authors: | Chi Cheng Decai Yang Meiting Bao Chuang Xue |
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Affiliation: | School of Bioengineering, Dalian University of Technology, Dalian, China |
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Abstract: | In this study, spray-coating was used to prepare dihydroxypolydimethylsiloxane (PDMS) composite membranes with high flux and separation factor for biobutanol recovery from aqueous solution. A thin, smooth, and defect-free PDMS layer was prepared by spray-coating on polyvinylidene difluoride ultrafiltration membrane with little PDMS penetration. The effects of process parameters for membrane fabrication and pervaporation on membrane performance were investigated. A membrane with 2 μm active layer was obtained with a high flux of 1306.9 g/m2 h. The optimal membrane with the highest pervaporation separation index (PSI) (19.15 kg/m2 h) showed a total flux of 530.6 g/m2 h and a separation factor of 36.1 at 37°C, and a PSI of 65.61 kg/m2 h and a flux of 1927.0 g/m2 h at 70°C. Membrane performance was affected by feed composition and temperature. Acetone-butanol-ethanol solution and fermentation broth gave lower butanol fluxes and separation factors compared to butanol model solution. |
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Keywords: | membranes separation techniques synthesis and processing techniques |
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