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Title: Pervaporation Dehydration of Biofuels and Solvents
Keywords: Pervaporation, dehydration, biofuels, solvents, ZIF-8, polybenzimidazole
Issue Date: 14-May-2013
Source: SHI GUIMIN (2013-05-14). Pervaporation Dehydration of Biofuels and Solvents. ScholarBank@NUS Repository.
Abstract: As fossil fuels deplete and carbon dioxide accumulates in the atmosphere, biofuels and solvents produced from non-food biomass via fermentation have gained worldwide attention. Among many purification processes, pervaporation is energy-efficient for separation of azeotropic mixtures in the fermentation broths. However, current commercially available polymeric membranes are not stable at high operating temperature. Therefore, this thesis focuses on the study of thermally and chemically robust pervaporation membranes. Polybenzimidazole(PBI) has a high Tg of 425-435 oC but low permeability. To enhance the permeability of PBI membranes, nano-sized zeolitic imidazolate frameworks(ZIF-8) with good thermal and chemical stability was used as filler for PBI membranes. ZIF-8 particles in PBI membrane increases water permeability by almost one order without decrease in selectivity for water for dehydration of alcohols. Moreover, PBI/P84 polyimide dual-layer hollow fiber and ceramic/thin film composite membranes were also developed for dehydration of acetone and alcohols respectively, demonstrating stable separation performance.
Appears in Collections:Ph.D Theses (Open)

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