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    • 3. 发明专利
    • Porous membrane, its manufacturing method, and repairing method of porous membrane
    • 多孔膜及其制造方法和多孔膜的修复方法
    • JP2007007490A
    • 2007-01-18
    • JP2005187875
    • 2005-06-28
    • Toray Ind Inc東レ株式会社
    • HENMI MASAHIROTAN KOICHIFURUNO SHUJI
    • B01D63/00B01D67/00
    • PROBLEM TO BE SOLVED: To provide a porous membrane which obtains permeation water with extremely high stability without deteriorating the inhibition ratio by large micro pores and without deteriorating the inhibition ratio even if the porous membrane is injured during membrane element preparation or the porous membrane is operated for a long term.
      SOLUTION: The porous membrane is characterized in that the particulate having the number average particle size of more than 1.2 times to 2.0 times or less of the average pore diameter is attached on the surface of the liquid to be treated of the porous membrane. The preparing method of the porous membrane comprises filtering a particulate dispersion with the number average particle size of more than 1.2 times to 20 times or less of the average pore diameter of the porous membrane from the liquid side to be treated of the porous membrane. The repairing method comprises a step of measuring the average pore diameter of the porous membrane, a step of measuring the maximum pore diameter of the porous membrane and a step of filtering the particulate dispersion with the average particle size of more than 1.2 times of the average pore diameter to the maximum pore diameter or less.
      COPYRIGHT: (C)2007,JPO&INPIT
    • 要解决的问题:提供一种多孔膜,其以非常高的稳定性获得渗透水,而不会由于大的微孔而不损害抑制率,并且即使在膜元件制备过程中多孔膜受损也不破坏抑制率,或多孔膜 膜长期运行。 解决方案:多孔膜的特征在于,数均粒径大于平均孔径的1.2倍至2.0倍以下的颗粒附着在多孔膜待处理液体的表面上 。 多孔膜的制备方法包括从多孔膜的待处理液体侧过滤数均粒径大于多孔膜的平均孔径的1.2倍〜20倍以下的粒状分散液。 修复方法包括测定多孔膜的平均孔径的步骤,测定多孔膜的最大孔径的步骤以及平均粒径为平均粒径的1.2倍以上的粒状分散液的过滤步骤 孔径至最大孔径以下。 版权所有(C)2007,JPO&INPIT