A Cationic Reverse Osmosis Membrane Derived from 4-Vinylpyridine-Styrene Copolymer

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Other Title
  • 4-ビニルピリジン-スチレン共重合体系荷電型逆浸透膜
  • ４‐ビニルピリジン‐スチレン共重合体系荷電型逆浸透膜

Abstract

A new type of a charged membrane has been prepared from the 4-vinylpyridinestyrene copolymer and performance of the membrane was examined. The preparation of the weak-basic type membrane was carried out in the N, N-dimethylformamidedioxane solvent medium. The membrane performance was very poor as a reverse osmosis membrane. The strong-basic type membranes were prepared by the reaction of the 4-vinylpyridinestyrene copolymer with I ( CH2)nI (n = 4, 6) in N, N-dimethylformamide. The reaction was conducted to introd uce quarternary groups and intermolecular closslinking into membrane. These membranes have water flux of 2∼10l/m2⋅h and salt rejection of 90∼97% under 80 kg/cm2 with O.5% NaCl aqueous solution. These properties are closely related to the interstitial ionic concentration and water content of the membrane. The salt rejection (Rs), water permeability (k) and water content (H) were found to be expressed by equation, k=A⋅exp (BRs), k=ko⋅exp(-B'(1-H)/H).<BR>The composite membrane was formed by casting the polymer solution in ultra-thin film on a polypropylene micro-porous supporter and by subsequent solvent evaporation at 65°C for 30min. Ethyl methyl ketoneN, N-dimethylacetamide (2/1, wt/wt) was found to be a prope r solvent for quarternarization of the copolymer and film casting. The membrane prepared from the 4-vinylpyridinestyrene (1/1, mole ratio) copolymer quaternized with 2 moles equivalent of the iodide had a good performance as a reverse osmosis membrane: water flux of 13.4l/m2⋅h and salt rejection of 97%.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1981 (2), 281-287, 1981-02-10

    The Chemical Society of Japan

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