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Composite semipermeable membrane

A technology of composite semipermeable membrane and support membrane, which is applied in the direction of semipermeable membrane separation, membrane technology, layered products, etc., and can solve problems such as damage, weak strength of composite semipermeable membrane, and membrane peeling.

Active Publication Date: 2016-01-20
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the strength of the composite semipermeable membrane is weak, the membrane will be peeled off or damaged, so that a satisfactory salt removal rate cannot be obtained

Method used

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  • Composite semipermeable membrane
  • Composite semipermeable membrane
  • Composite semipermeable membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0165] a. Fabrication of Support Membrane

[0166] A mixture of a solute (polysulfone: UDEL (registered trademark) p-3500 manufactured by Solvay Advanced Polymers Co., Ltd.) and a solvent (DMF) was kept heated at 100° C. for 2 hours while stirring to prepare a stock solution of a porous support. The concentration of polysulfone in the stock solution was 16% by weight.

[0167] The prepared stock solution was cooled to room temperature, and supplied to an extruder for high-precision filtration. After that, the filtered stock solution was slot-cast to a long-fiber nonwoven fabric formed of polyethylene terephthalate fibers (fiber diameter: 1 dtex, thickness: about 75.3 μm, weight: 49.5 g / m 2 ) was immediately immersed in pure water and washed for 5 minutes to obtain a support membrane.

[0168] b. Formation of separation functional layer

[0169]The obtained supporting film was dipped in a 4.0% by weight m-PDA aqueous solution for 2 minutes, and then lifted up slowly so that ...

Embodiment 2

[0171] A DMF solution of 20% by weight of polysulfone was used, and a long-fiber nonwoven fabric with a thickness of 99 μm (fiber diameter: 1 decitex, weight: 48.8 g / m 2 ) as the substrate, except that, the same operation as in Example 1 was performed to obtain the composite semipermeable membrane of Example 2.

Embodiment 3

[0173] A DMF solution of 20% by weight polysulfone was used as a thermoplastic resin solution, and a thickness of 105 μm and a weight of 80.1 g / m were used 2 (Fiber diameter: 1 dtex) long-fiber nonwoven fabric was used as a base material, and it carried out similarly to Example 1, and obtained the composite semipermeable membrane of Example 3.

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Abstract

For the purpose of providing a composite semipermeable membrane that has a good balance between strength and water permeability, the present invention provides a composite semipermeable membrane which is provided with a supporting membrane that comprises a base and a porous supporting body and a separation function layer that is arranged on the porous supporting body, and wherein the total of the weight (A) of the base and the weight (B) of the porous supporting body inside the base per unit area of the base, namely (A + B) is from 30 g / m2 to 100 g / m2 (inclusive) and the ratio of the weight (B) to the weight (A), namely B / A is from 0.10 to 0.60 (inclusive).

Description

technical field [0001] The invention relates to a composite semipermeable membrane which can be used for selectively separating liquid mixtures and a manufacturing method thereof. The composite semipermeable membrane obtained by the present invention is suitable for desalination of seawater or salt water, for example. Background technique [0002] Regarding the separation of mixtures, although there are various techniques for removing substances (such as salts) dissolved in solvents (such as water), in recent years, as a process for saving energy and resources, the membrane separation method Applications are expanding. As membranes used in the membrane separation method, there are microfiltration membranes, ultrafiltration membranes, nanofiltration membranes, composite semipermeable membranes, etc., which are used to obtain drinking water from, for example, seawater, brackish water, water containing harmful substances, etc. situation, or for the manufacture of industrial u...

Claims

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Application Information

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IPC IPC(8): B01D69/10B01D69/12B01D71/48B01D71/56B01D71/68B32B5/18
CPCB01D71/56B32B5/18B01D61/025B32B2307/54B01D69/1251B01D69/1214B01D69/107B01D69/1216B01D2325/24B01D2323/12B01D2325/20
Inventor 古野修治冈本宜记广泽洋帆木村将弘佐佐木崇夫
Owner TORAY IND INC
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