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Semipermeable composite membrane and process for producing the same

A composite semipermeable membrane, a technology for manufacturing method, applied in semipermeable membrane separation, chemical instruments and methods, membrane technology and other directions, can solve the problems of reduced membrane performance, inability to obtain permeable liquid, inability to fully remove unreacted components, etc. , to achieve the effect of no degradation of membrane performance, excellent water permeability and salt rejection

Inactive Publication Date: 2007-08-29
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, even with the above methods, unreacted components cannot be sufficiently removed, and the required high-purity permeate, etc. cannot be obtained.
In addition, if it is necessary to sufficiently remove unreacted components, long-term treatment is required, which will cause a decrease in membrane performance
Furthermore, the method described in Patent Document 9 is a method for removing dirt adhering to the membrane surface of the membrane element during membrane separation operation, not a method for removing unreacted residues in the membrane element

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0107] Examples are given below to describe the present invention, but these examples do not limit the present invention in any way.

[0108] [Evaluation and measurement method]

[0109] (Determination of content of unreacted polyfunctional amine components)

[0110] In the aqueous solution (25 ℃) that contains ethanol 50% by weight, immerse the composite semipermeable membrane (Φ 25mm) before the membrane cleaning treatment that makes in the embodiment and comparative example, leave standstill for about 8 hours, extract in the composite semipermeable membrane Unreacted polyfunctional amine component. The UV absorbance at 210 nm of the obtained extract was measured. On the other hand, the correlation (calibration curve) between the concentration of the polyfunctional amine component in the 50% by weight ethanol aqueous solution and the 210nm absorbance of the aqueous solution was prepared in advance, and these were used to measure the concentration of the polyfunctional amin...

manufacture example 1

[0119] (production of porous support)

[0120] A film-forming coating obtained by dissolving 18% by weight of polysulfone (manufactured by Solvay, P-3500) in N,N-dimethylformamide (DMF) was uniformly coated on a non-woven fabric base material, and the wet thickness is 200 μm. Immediately thereafter, it was immersed in water at 40 to 50° C. to solidify it, and DMF as a solvent was completely extracted and washed to prepare a porous support having a polysulfone microporous layer on a nonwoven fabric substrate.

Embodiment 1

[0122] The produced porous support was heated and dried at 40°C. The water content in the porous support after heating and drying is 1g / m 2 .

[0123] An amine aqueous solution containing 1% by weight of m-phenylenediamine, 3% by weight of triethylamine, and 6% by weight of camphorsulfonic acid (the moving speed of the amine component: 0.02 mg / m) was coated on the above-mentioned porous support. 2 sec), and then remove excess amine aqueous solution by wiping, thereby forming an aqueous solution covering layer. Next, an isooctane solution containing 0.2% by weight of trimesic acid chloride was applied to the surface of the aqueous solution coating layer. Then, excess solution was removed, and then kept in a hot air dryer at 120° C. for 3 minutes to form a surface layer containing polyamide resin on the porous support to obtain an unwashed composite semipermeable membrane. The permeation test was carried out using the fabricated composite semi-permeable membrane without clean...

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PUM

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Abstract

The present invention aims at providing a composite semipermeable membrane having outstanding water permeability and salt-blocking rate, and extremely small amount of unreacted polyfunctional amine components in the porous support, and at providing a process for producing the composite semipermeable membrane. A composite semipermeable membrane having a skin layer formed on the surface of a porous support, the skin layer comprising a polyamide resin obtained by interfacial polymerization of a polyfunctional amine component and a polyfunctional acid halide component, wherein the porous support has a microporous layer on a base material, and the content of an unreacted polyfunctional amine component in the base material after a membrane washing treatment is 0.5 mg / m 2 or less.A semipermeable composite membrane which is excellent in water permeability and salt rejection and is extremely reduced in the amount of an unreacted polyfunctional amine ingredient remaining in a porous support. The semipermeable composite membrane comprises a porous support and, formed on the surface thereof, a skin layer comprising a polyamide resin obtained by the interfacial polymerization of a polyfunctional amine ingredient and a polyfunctional halogenated acid ingredient, and is characterized in that the porous support comprises a base and a finely porous layer formed thereon and the base after a membrane cleaning treatment has a content of the unreacted polyfunctional amine ingredient of 0.5 mg / m2 or lower.

Description

technical field [0001] The present invention relates to a composite semipermeable membrane comprising a surface layer containing a polyamide resin and a porous support supporting the surface layer, and a method for producing the same. This composite semi-permeable membrane is suitable for the production of ultrapure water, desalination of salt water or seawater, etc., and can also remove and recover pollution sources or effective substances contained in pollution caused by pollution such as dyeing drainage or electrodeposition coating drainage. , Contribute to the closure of drainage. In addition, it can also be used for advanced treatment such as concentration of active ingredients in food applications, etc., and removal of harmful ingredients in purified water or sewage applications. Background technique [0002] At present, as a composite semipermeable membrane, a lot of composite semipermeable membranes that form a surface layer composed of polyamide obtained by interfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/10B01D69/12
CPCB01D69/02B01D71/56B01D69/125B01D69/10B01D69/12B01D69/1251
Inventor 小西贵久小原知海原田千秋井上彻雄仓田直记釜田卓待永广宣
Owner NITTO DENKO CORP