发明申请
- 专利标题: METHOD OF IMPROVING REJECTION OF PERMEABLE MEMBRANE AND PERMEABLE MEMBRANE
- 专利标题(中): 改善渗透膜和渗透膜的抑制方法
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申请号: US13496785申请日: 2010-09-27
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公开(公告)号: US20120168370A1公开(公告)日: 2012-07-05
- 发明人: Tetsuya Aoki , Takahiro Kawakatsu
- 申请人: Tetsuya Aoki , Takahiro Kawakatsu
- 申请人地址: JP Tokyo
- 专利权人: KURITA WATER INDUSTRIES LTD.
- 当前专利权人: KURITA WATER INDUSTRIES LTD.
- 当前专利权人地址: JP Tokyo
- 优先权: JP2009-224643 20090929
- 国际申请: PCT/JP2010/066654 WO 20100927
- 主分类号: B01D65/06
- IPC分类号: B01D65/06 ; B01D71/06
摘要:
Provided is a method capable of effectively improving the rejection of a membrane without considerably lowering the permeation flux, even when the membrane has significantly degraded. The method of improving the rejection of a permeable membrane includes a step (amino treatment step) of passing an aqueous solution (amino treatment water) having a pH of 7 or less and containing an amino group-containing compound having a molecular weight of 1000 or less through the permeable membrane. After this amino treatment step, water having a higher pH than the amino treatment water is allowed to pass through the permeable membrane. Thus, by allowing the low-molecular-weight amino compound to pass through the membrane, a degraded portion of the membrane can be restored without considerably lowering the permeation flux of this permeable membrane, and the rejection can be effectively improved.