SEPARATION MEMBRANE, SEPARATION MEMBRANE ELEMENT AND SEPARATION MEMBRANE MODULE |
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| 申请号 | US15516969 | 申请日 | 2015-10-06 | 公开(公告)号 | US20170296985A1 | 公开(公告)日 | 2017-10-19 |
| 申请人 | TOYOBO CO., LTD.; | 发明人 | Takahito Nakao; Mayumi Akashi; Miyuki Yao; Seiji Watanuki; Tooru Kitagawa; | ||||
| 摘要 | [Problem] To provide a membrane for the forward osmosis method, which keeps a high porosity, reduces concentration polarization by appropriately controlling the pore distribution, achieves both high water permeability and a self-supporting property, and has high chemical durability such that the membrane is applicable to various draw solutions. [Solution] A separation membrane having a structure inclined from an outer surface side to an inner surface side, a ratio between a thickness of a dense layer having a dense polymer density and a thickness of a coarse layer having a coarse polymer density being in a range of 0.25≦(the thickness of the coarse layer)/[(the thickness of the dense layer)+(the thickness of the coarse layer)]≦0.6, when measuring polymer density distribution in a thickness direction of the separation membrane by Raman spectroscopy. | ||||||
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