Title:
HOLLOW-FIBER REVERSE-OSMOSIS MEMBRANE ELEMENT AND MODULE
Document Type and Number:
WIPO Patent Application WO/2015/111613
Kind Code:
A1
Abstract:
[Problem] To provide a large-bore hollow-fiber reverse-osmosis membrane element having excellent resistance to contamination and little loss in flow pressure (i.e., a high water permeation rate). [Solution] A dual-open-ended hollow-fiber reverse-osmosis membrane element in which both ends of a hollow-fiber membrane wound body are opened, the hollow-fiber membranes being arranged to cross each other by being helically wound around a porous distribution pipe, wherein the hollow-fiber reverse-osmosis membrane element is characterized in that: a) the outer diameter of the element is 260 mm or more; b) the number of windings per element length in the range from the outermost layer of the hollow-fiber membrane wound body to at least 1/8 the thickness of the wound body is 0.33-1.75; and (c) the number of windings per element length in the range from the innermost layer of the hollow-fiber membrane wound body to at least 1/4 the thickness of the wound body is greater than 1.75.
Inventors:
MARUI KATSUSHIGE (JP)
TOKUNAGA KOJI (JP)
HATAKEYAMA TSUYOSHI (JP)
KUMANO ATSUO (JP)
TOKUNAGA KOJI (JP)
HATAKEYAMA TSUYOSHI (JP)
KUMANO ATSUO (JP)
Application Number:
PCT/JP2015/051519
Publication Date:
July 30, 2015
Filing Date:
January 21, 2015
Export Citation:
Assignee:
TOYO BOSEKI (JP)
International Classes:
B01D61/08; B01D63/02
Foreign References:
| JPH0314492B2 | 1991-02-26 | |||
| JP2003290632A | 2003-10-14 | |||
| JPS52143974A | 1977-11-30 | |||
| US5702601A | 1997-12-30 |
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