Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/30297
Title: FUNDAMENTALS OF PVDF HOLLOW FIBER MEMBRANE FORMATION AND PERV APORATION FOR ETHANOL-WATER SEPARATION
Authors: PANU SUKITPANEENIT
Keywords: PVDF hollow fiber, pervaporation, ethanol-water separation, mass transport, membrane morphology, dual-layer hollow fiber
Issue Date: 2-Aug-2011
Source: PANU SUKITPANEENIT (2011-08-02). FUNDAMENTALS OF PVDF HOLLOW FIBER MEMBRANE FORMATION AND PERV APORATION FOR ETHANOL-WATER SEPARATION. ScholarBank@NUS Repository.
Abstract: In this thesis, a comprehensive study on the fabrication and pervaporation of poly(vinylidene fluoride) (PVDF) hollow fiber membranes for ethanol recovery was presented. Firstly, the fundamental science of fabricating PVDF hollow fiber membranes was established. The correlation among membrane morphology, crystallinity and mechanical properties as functions of non-solvent additives and dope rheology in the phase inversion was elucidated. Subsequently, the mass transport in pervaporation of the ethanol/water system via PVDF hollow fiber membranes was investigated through the pore-flow concept. We have derived new governing equations and confirmed the pervaporation transport in the membranes following a newly modified pore-flow model. The modified pore-flow model showed a better prediction for the permeate composition than the pore-flow model. The feasibility of fabricating PVDF hollow fiber membranes with desirable morphology and pore size employing the modified pore-flow concept was further examined. It has been discovered that an increase in air-gap distance or take-up speed not only effectively suppressed the evolution of macrovoids but also resulted in the reduction of pore size and the narrowing of pore size distribution, hence leading to the enhancement of membrane performance. Furthermore, we have also demonstrated the design and engineering of PVDF/nano-silica dual-layer hollow fiber membranes. A comparison with literature data revealed that the newly developed membranes outperform most other polymeric membranes for ethanol recovery applications.
URI: http://scholarbank.nus.edu.sg/handle/10635/30297
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