Forward osmosis membrane flow system and composite semipermeable membrane for forward osmosis membrane flow system

A technology of composite semipermeable membrane and flow system, applied in the field of composite semipermeable membrane, can solve the problems of insufficient system efficiency and so on

Inactive Publication Date: 2014-02-12
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these membranes show different properties and behaviors in forward osmosis than those in reverse osmosis, so the efficiency of systems using these membranes as forward osmosis membranes is not sufficient, and it is necessary to further improve the efficiency of systems utilizing forward osmosis technology

Method used

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  • Forward osmosis membrane flow system and composite semipermeable membrane for forward osmosis membrane flow system
  • Forward osmosis membrane flow system and composite semipermeable membrane for forward osmosis membrane flow system

Examples

Experimental program
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Effect test

Embodiment 1

[0076] (Manufacturing of epoxy resin porous substrate)

[0077] 139 parts by weight of bisphenol A type epoxy resin (manufactured by Japan Epoxy Resin Corporation, Epicoat 828), 93.2 parts by weight of bisphenol A type epoxy resin (manufactured by Japan Epoxy Resin Corporation, Epicoat 1010), two (4-amino Cyclohexyl) methane 52 parts by weight and polyethylene glycol 200 (manufactured by Sanyo Chemical Industry Co., Ltd.) 500 parts by weight epoxy resin composition is filled in a cylindrical mold (outer diameter 35 cm, inner diameter 10.5 cm) to a height of 30 cm , cured at room temperature at 25°C for 12 hours, and then reacted and cured at 130°C for 18 hours to make a cylindrical resin block. While rotating the resin block around the axis of the cylinder, it was continuously cut into thin slices with a thickness of 145 μm from the surface using a cutting device (manufactured by Toshiba Machine Co., Ltd.) to obtain a long epoxy resin sheet (length: 100 m) . The epoxy resin ...

Embodiment 2

[0081] The composite semipermeable membrane of Example 2 was obtained in the same manner as in Example 1 except that the cutting thickness of the resin block was changed to 90 μm in preparation of the epoxy resin porous membrane. The finally obtained composite semipermeable membrane of Example 2 had a thickness of 80 μm.

Embodiment 3

[0083] The composite semipermeable membrane of Example 2 was obtained in the same manner as in Example 1 except that the cutting thickness of the resin block was changed to 55 μm in preparation of the epoxy resin porous membrane. The finally obtained composite semipermeable membrane of Example 3 had a thickness of 50 μm.

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PUM

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Abstract

A forward osmosis membrane flow system (1) is provided with: a high osmotic pressure fluid flow section (2) to which a high osmotic pressure fluid is supplied; a low osmotic pressure fluid flow section (3) to which a low osmotic pressure fluid having an osmotic pressure lower than the osmotic pressure of the high osmotic pressure fluid is supplied; and a semipermeable membrane (4) that separates the high osmotic pressure fluid flow section and the low osmotic pressure fluid flow section from each other. The flow rate in the high osmotic pressure fluid flow section (2) is increased by fluid migration from the low osmotic pressure fluid flow section (3) to the high osmotic pressure fluid flow section (2) through the semipermeable membrane (4). The semipermeable membrane (4) is a composite semipermeable membrane which is obtained by forming a polyamide-based skin layer on an epoxy resin porous membrane.

Description

technical field [0001] The invention relates to a forward osmosis membrane flow system and a composite semipermeable membrane used in the forward osmosis membrane flow system. Background technique [0002] The increasing global demand for energy has increased interest in renewable energy sources and improvements in fuel use efficiency. In particular, in the seawater desalination process using reverse osmosis membranes, it is necessary to generate fresh water necessary for human survival from seawater. On the other hand, it is generally necessary to apply energy higher than the osmotic pressure of seawater, so a large amount of energy is required. In addition, in the seawater desalination process, the salt filtered out of the fresh water exists in the form of concentrated seawater, so it needs to be discarded. Usually, this concentrated seawater is discharged into the sea in a state in which the salt concentration has been reduced by mixing with seawater. On the other hand,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D61/00B01D69/12B01D71/46F03B17/06F03G7/00F04D33/00F04F99/00
CPCY02B10/50B01D69/12F03B13/00B01D61/002Y02E10/28B01D71/46B01D71/56F05B2220/602Y02E10/20
Inventor 土井孝夫林修广濑雅彦小泓诚川口佳秀原田宪章
Owner NITTO DENKO CORP
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