SEPARATION MEMBRANE, SEPARATION MEMBRANE ELEMENT AND SEPARATION MEMBRANE MODULE

[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 mem...

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Bibliographische Detailangaben
Hauptverfasser:	Watanuki Seiji, Akashi Mayumi, Kitagawa Tooru, Nakao Takahito, Yao Miyuki
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:	[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.