发明名称 |
Osmosis membrane |
摘要 |
A composite reverse osmosis membrane has a polyamide type skin layer whose specific surface area ranges from 3 to 1000. The composite reverse osmosis membrane of this invention is superior in the salt rejection property and water permeability. The composite reverse osmosis membrane comprises a negatively-charged crosslinked polyamide type skin layer obtained by reacting a compound having polyfunctional amino groups and a polyfunctional acid halide compound having polyfunctional acid halide groups, and a microporous support to support the skin layer. The specific surface area of the skin layer is at least 3. A first stage of reverse osmosis treatment is carried out in a membrane module using this composite reverse osmosis membrane. The skin layer can be coated with a layer of an organic polymer having positively-charged groups e.g. polyethyleneimine in order to be used as another membrane module. The organic polymer of this case is crosslinked, for example, by glutaraldehyde. The layer which is crosslink-coated on its surface area is a composite reverse osmosis membrane excellent in desalination of mineral salt in a low-concentration region and removal of cationic organic materials.
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申请公布号 |
US5989426(A) |
申请公布日期 |
1999.11.23 |
申请号 |
US19960677322 |
申请日期 |
1996.07.02 |
申请人 |
NITTO DENKO CORP. |
发明人 |
HIROSE, MASAHIKO;ITO, HIROKI;TANAKA, KAZUO |
分类号 |
B01D61/02;B01D67/00;B01D69/00;B01D69/12;(IPC1-7):B01D29/00;B01D61/00;B01D63/00 |
主分类号 |
B01D61/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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