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Please use this identifier to cite or link to this item: https://scholars.lib.ntu.edu.tw/handle/123456789/410402
Title: Integrating microfiltration with cocrystallization for separating glucose from ethanol aqueous solution
Authors: Wu S.-E.
Hwang K.-J.
Cheng T.-W.
Chien C.-H.
Tung K.-L. 
Keywords: Bio-ethanol;Crystallization;Ethanol purification;Membrane filtration;Microfiltration
Issue Date: 2017
Journal Volume: 78
Start page/Pages: 344-350
Source: Journal of the Taiwan Institute of Chemical Engineers 
Abstract: 
Membrane filtration has strong potential for bioethanol purification because of its high product selectivity, low energy consumption, and high system flexibility. A method combining microfiltration with cocrystallization was investigated for purifying ethanol from fermentation broth. After yeast removal, unreacted glucose and ethanol must be separated to diminish the product inhibition effect and to enable continuous operation. The simulated fermentation broth was used in experiments to focus salt¡Vsugar cocrystals removal in this study. Sodium chloride (NaCl) was used as a precursor to form crystal nucleus, leading to cocrystalization with glucose. The effect of NaCl concentration and crystallization time on crystal size and growth rate was investigated. The Feret diameters of crystals increased with time, but the crystal growth rate reduced exponentially during crystallization. The optimal mole ratio of NaCl to glucose was determined as 25. Constant pressure microfiltration was subsequently conducted to separate the crystals from ethanol solution. The filtration flux attenuated with time because of membrane fouling, which was majorly attributed to cake formation. The number of crystals increased with the NaCl concentration, resulting in heavier cake mass and therefore higher glucose rejection. Specific filtration resistance was inversely proportional to the square of the crystal size. Moreover, filtration flux increased with the filtration pressure because of the higher driving force. The cake formed by salt¡Vsugar cocrystals was slightly compressible (cake compressibility?=?0.23). An increase in salt concentration led to higher crystal formation, higher cake growth, and therefore higher glucose rejection. The optimal NaCl concentration, at which the highest crystal formation and the glucose rejection were obtained, was 165?kg/m 3 . The proposed method can be used to predict filtration performance from operating conditions and crystal characteristics and applied to other biomass sources in the processes of bioethanol purification. ? 2017 Taiwan Institute of Chemical Engineers
URI: https://scholars.lib.ntu.edu.tw/handle/123456789/410402
ISSN: 18761070
DOI: 10.1016/j.jtice.2017.06.030
Appears in Collections:化學工程學系

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臺大位居世界頂尖大學之列,為永久珍藏及向國際展現本校豐碩的研究成果及學術能量,圖書館整合機構典藏(NTUR)與學術庫(AH)不同功能平台,成為臺大學術典藏NTU scholars。期能整合研究能量、促進交流合作、保存學術產出、推廣研究成果。

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