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Preparation and characterization of tubular carbon molecular sieving membrane by vacuum-assisted dip-coating method and their gas separation properties
|關鍵字:||管柱式碳膜;浸塗法;真空輔助系統;氣體分離;氧化鋁基材;Tubular carbon membrane;dip-coating;Vacuum-assisted system;Gas separation;Al2O3 support||引用:|| X. He, M.-B. Hägg, Hollow fiber carbon membranes: Investigations for CO2 capture, Journal of Membrane Science, 378 (2011) 1-9.  P. Shao, M.M. D.-C., M.D. Guiver, A. Kumar, Simulation of membrane-based CO2 capture in a coal-fired power plant, Journal of Membrane Science, 427 (2013) 451-459.  M. Songolzadeh, M. Soleimani, M. Takht Ravanchi, R. Songolzadeh, Carbon Dioxide Separation from Flue Gases: A Technological Review Emphasizing Reduction in Greenhouse Gas Emissions, The Scientific World Journal, 2014 (2014), 1-35.  D.J. Thambimuthu K, Gupta M. Regina, CO2 Capture and Reuse, In Proceedings of IPCC workshop on carbon dioxide capture and storage, (2002) 31-52.  J.-R. Li, Y. Ma, M.C. McCarthy, J. Sculley, J. Yu, H.-K. Jeong, P.B. Balbuena, H.-C. 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研究結果顯示，真空輔助系統能避免鑄膜液因毛細作用力而滲入基材孔隙，提升選擇層結構平整度；使用三氯甲烷作為溶劑能減緩塗佈液受重力影響，使薄膜整體膜厚值較為均ㄧ；最佳條件為塗佈液濃度10 wt.%、基材浸沒與抽出速度為1 mm/s、塗佈6次，其H2/N2及CO2/N2的選擇係數為8.8與6.7，H2的滲透率為464 Barrer、CO2的滲透率為356 Barrer。
Carbon molecular sieve (CMS) tubular membrane is regarded as the promising material for gas separation in membrane reactor due to its advantages such as can be combined with the catalyst easily, high specific surface area, high gas selectivity, and superior heat and chemical stability.
Dip-coating is a common method for tubular membrane preparation. The process of dip-coating just includes immersion, retention, withdrawal, and drying steps. However, although the roughness of tubular membrane would be decrease by filling with casting solution through capillary force, the bottom width of tubular membrane would be increased owing to the gravity, resulting in decreased uniformity of membrane.
In this study, the CMS tubular membranes were obtained by one step of vacuum-assisted dip-coating and pyrolysis procedure. Porous alumina tube was chosen as supporting material; polyethyleneimine (PEI) was chosen as membrane precursor; N-methyl-2-pyrrolidone (NMP) and Trichloromethane (TCM) were chosen as casting solutions. The effects of vertical immersion velocity, vertical withdrawal velocity, casting pressure, casting solution composition, and coating times on the membrane structure and gas separation performance were discussed in this study sequentially.
The results indicated that coating membrane on the porous alumina tube surface by vacuum-assisted dip-coating method could enhance the flatness of CSM tubular membrane surface, resulting in higher gas pair selectivity. Moreover, using TCM as the casting solution could diminish the gravity force effect, resulting in uniform membrane thickness. When control the casting solution concentration = 10 wt.% (TCM as solvent); vertical immersion velocity and vertical withdrawal velocity = 1 mm/s; coating times = 6, the as-prepared CMS tubular membrane exhibited the best gas selectivity of H2/N2 =8.8 and CO2/N2 =6.7 and permeability of H2 464 Barrer and CO2 356 Barrer.
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