Reverse Osmotic Concentration of Aqueous 1, 2 Ethanediol Solutions

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Other Title
  • エチレングリコール水溶液の逆浸透濃縮
  • エチレン グリコール スイヨウエキ ノ ギャクシントウ ノウシュク

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Description

Reverse osmotic concentration of aqueous 1, 2 ethanediol solution was carried out using composite membrane PEC-1000 supplied from Toray Co. Ltd. Separation of 1, 2 ethanediol and flux through the membrane were measured under the following conditions : concentration of 1, 2 ethanediol; 2.9, 5.2, 9.8, and 12.8 wt%, operating pressures; 2.9, 3.9, 5.5, and 6.9 MPa. Measured separation were around 95% at lower solute concentration, but less than 85% at higher solute concentration and medium operating pressure.<BR>An analysis of the data with Spiegler-Kedem's transport model shows that the values of reflection co-efficient σ, solute and hydraulic permeabilities ω and Lp were 1.0, 4.6 × 10-11 and 1.28 × 10-7 mol./ (m2·Pa·s), respectively.<BR>Energy and membrane area required were calculated to concentrate dilute 1, 2 ethanediol solutions by reverse osmosis. The energy per one kilogram of the concentrated 1, 2 ethanediol is proportional to the operating pressure and slightly depends on final concentration and concentration polarization, and found 0.1 to 0.25 kWh to concentrate upto 13.2 wt% from 1.3 wt%. The membrane area is inversely proportional to the operating pressure and found 0.05, 0.07 and 0.11 m/ (kg 1, 2 ethanediol/day), for 10, 8, 5 MPa at no concentration polarization to concentrate. upto 13.2 wt%. The area is strongly dependent on concentration polarization

Journal

  • MEMBRANE

    MEMBRANE 9 (1), 55-59, 1984

    THE MEMBRANE SOCIETY OF JAPAN

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