MEMBRANE
Online ISSN : 1884-6440
Print ISSN : 0385-1036
ISSN-L : 0385-1036
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Volume 14, Issue 6
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1989 Volume 14 Issue 6 Pages 375-381
    Published: November 01, 1989
    Released on J-STAGE: August 16, 2011
    DOIhttps://doi.org/10.5360/membrane.14.375
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1989 Volume 14 Issue 6 Pages 382-389
    Published: November 01, 1989
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.5360/membrane.14.382
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1989 Volume 14 Issue 6 Pages 390-393
    Published: November 01, 1989
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.5360/membrane.14.390
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1989 Volume 14 Issue 6 Pages 394-400
    Published: November 01, 1989
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.5360/membrane.14.394
    JOURNAL FREE ACCESS
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  • The effect of the operating temperature on the reverse osmotic permeation flux and solute rejection
    Jianhui Zhou, Haruhiko OHYA, Kanji MATSUMOTO, Yoichi NEGISHI
    1989 Volume 14 Issue 6 Pages 401-406
    Published: November 01, 1989
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.5360/membrane.14.401
    JOURNAL FREE ACCESS
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    Using three composite membranes (NS-300, NTR-7450, NTR-729 HF), reverse osmotic permeation flux and solute rejection have been measured at 1.5 MPa, 10-60° C for pure water, 0.5% NaCl and 0.5% MgSO4 aqueous solution. The results showed that the permeation remarkably increases, but rejection Ra slowly decreases, with the increase of operating temperature.
    The relationship between hydraulic permeability Lp and operating temperature in reverse osmotic separation have been theoretically derived using the solution-diffusion model. Introducing the temperature coefficient M defined by authors, the dependency of permeation on operating temperature can be expressed as following theoretical equation, lnLp (T) =lnLp (T) +Mln T/T0-Ps [Vs (T) /T-Vs (T0) /T0] (16) The dependence of rejection on temperature can be expressed as following experimental equation. Ra (T) =Ra (T0) (1+M/100) (T0/T-1) (19)
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  • Reverse Osmotic Concentration of Aqueous Solution of Low Molecular Weight Organic Solutes
    Part one : NS-100 and CA membranes
    Haruhiko OHYA, Zhou Jianhui, Tatsuya HARA, Takeshi HINO, Yoichi NEGISH ...
    1989 Volume 14 Issue 6 Pages 407-414
    Published: November 01, 1989
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.5360/membrane.14.407
    JOURNAL FREE ACCESS
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    Reverse osmotic rejections of some organic acids (acetic acid, propionic acid, butyric acid, valeric acid, succinic acid) and aldehydes (acetaldehyde, propionaldehyde, butyraldehyde) in aqueous solution have been studied using two composite membranes (NS-100 (P3500), NS-100 (P1700)) and cellulose acetate membrane. Separation of solute and permeation through the membrane were measured under the following condition : concentration of solute in most cases is in the range of 50-500 ppm. operating pressure 0.98-2.94 MPa. An analysis of data with Spiegler-Kedem's transport model was carried out to obtain membrane constants such as reflection coefficient σ, solute and hydraulic permeabilities ω and Lp.
    The result showed that NS-100 membrane gave the superior solute rejection and superior permeation flux. Its rejection was in the range of 40-90%. CA membrane gave the higher salt rejection, but had lower organic solute rejection and permeation flux. In the case of the concentration of solution bellow the 1000 ppm, the rejection does not depend on concentration. But beyond the 1000 ppm, the rejection decreases with the increase of concentration. For organic compounds having the same functional group, the rejection of a solute increases with the increase of molecular weight. Using NS-100 membrane, for organic solute of acids and aldehydes having the same carbon atom numbers, the rejection for acids is lower. This might be attributed to the electrostatic attraction force acting between the solute molecular and skin layer of the NS-100 membrane.
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  • Electric Properties of Phospholipid-mixed DOPH-Millipore Membranes
    Minoru Saito, Takeshi Koyano, Yasuo Miyamoto, Katsuaki Kaifu, Masakazu ...
    1989 Volume 14 Issue 6 Pages 415-417
    Published: November 01, 1989
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.5360/membrane.14.415
    JOURNAL FREE ACCESS
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    The electric resistance of phospholipid-mixed DOPH-Millipore membranes changed more rapidly according to the change of salt concentration than a DOPH-Millipore membrane. It was suggested that the phase transition of lipid molecules from multilayer leaflets to micelles or oil droplets occurs more rapidly in these membranes
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