Dehumidification of Air by Zeolite-filled Polymer Membrane.

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  • ITO Akira
    Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University
  • SASAKI Hideaki
    Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University
  • YONEKURA Minoru
    Mizusawa Industrial Chemicals, Ltd.

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  • ゼオライト混入高分子膜による脱湿操作
  • ゼオライト コンニュウ コウブンシ マク ニヨル ダッシツ ソウサ

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Abstract

Dehumidification of air was performed with a zeolite-filled membrane, which was prepared using the casting method from an aqueous mixture of zeolite and polymer. The humidity reduction of the feed air flowing through the sheet membrane cell was measured under reduced pressure on the permeate side. Dehumidification of the membrane was described in terms of the apparent permeabilities of air and water vapor evaluated from a plug-flow/perfect mixed-flow model in the membrane cell. Among the membrane materials tested, Zeolite 4A 70wt% filled carboxymethylcellulose (CMC) membrane of 32μm thickness showed air permeability of 8×10-11m3(STP)•m/(m2•s•kPa) and a separation factor of 6.5 for water vapor and air. Features of the zeolite-filled CMC membrane compared with those of commercial polymer membranes were low selectivity and high air permeation rate for air drying. The adsorption isotherm of water vapor for the zeolite filled CMC membrane indicated that dehumidification of the membrane was related to the improvement in the adsorption capacity at low range of humidity by mixing the zeolite with the polymer.

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