Mathematical Analysis on Diffusion Coefficient of Sodium Chloride in Cellulose Acetate Symmetric Membrane by Dialysis Process
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概要
- 論文の詳細を見る
Cellulose acetate (CA) symmetric membranes with the thickness of 15-20 μm were prepared from the acetone diluted casting solution of CA reverse osmosis (RO) membrane. The dialysis experiment of sodium chloride through this membrane was made. The diffusion equation including the effect of osmosis was derived. And the diffusion coefficient of sodium chloride in CA symmetric membrane was obtained by mathematical analysis using this equation and dialysis experimental data. It was found that the diffusion coefficient of sodium chloride in CA symmetric membrane should be a function of the time and could be expressed by equation of<BR>D=D<SUB><I>i</I></SUB>e-t/τ+D<SUB>∞</SUB> (1-e-t/τ) <BR>It was found that the diffusion coefficient of sodium chloride in CA symmetric membrane decreased with the time during dialysis experiment and this decrease occured mainly at the beginning of the experiment. The degree of this decrease was found to be about 8-14%. The diffusivity of NaCl in CA symmetric membrane decreased with the increase of initial solute concentration used. The effect of concentration induced compaction on the membrane structure is proposed to interpreted this diffusion coefficient change.
- 日本膜学会の論文
著者
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Negishi Yoichi
Department of Drug and Gene Delivery Systems, School of Pharmacy, Tokyo University of Pharmacy and L
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Ohya Haruhiko
Department De Genie Chimique Universite Nationale De Yokohama
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Huang Jicai
Guangzhou Institute of Chemistry, Academia Sinica, China
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Yamashida Shigeru
Department of Material Science and Chemical Engineering, Faculty of Engineering, Yokohama National U
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Negishi Yoichi
Department of Material Science and Chemical Engineering, Faculty of Engineering, Yokohama National University
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Negishi Yoichi
Department of Chemical Engineering, Yokohama National University
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Yamashida Shigeru
Department of Material Science and Chemical Engineering, Faculty of Engineering, Yokohama National University
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