期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 65, 期 2-3, 页码 197-208出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2003.08.010
关键词
pervaporation; membrane; silica; Maxwell-Stefan; diffusion
Pervaporation experiments were performed on microporous silica membranes in the temperature range 30-80 degreesC using binary liquids containing 5-22 wt.% water. The organic solvents used were methanol, N,N-dimethylformamide (DMF) and 1,4-dioxane. The dependency of flux and selectivity on temperature and feed composition were investigated. The results were interpreted in terms of the Maxwell-Stefan theory, and Maxwell-Stefan diffusion coefficients at 60 degreesC were estimated. Water, methanol and DMF were found to diffuse through silica by a surface diffusion mechanism, while 1,4-dioxane was transported mainly by viscous flow through mesopores or small defects. DMF inhibited the transport of water, which may be explained by micropore blocking by strongly adsorbed DMF molecules. The flux of methanol appears to be dominated by a dragging effect by the larger water flux. (C) 2003 Elsevier Inc. All rights reserved.
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