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Semipermeable composite membrane and process for producing the same

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

Inactive Publication Date: 2009-12-16
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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  • Semipermeable composite membrane and process for producing the same
  • Semipermeable composite membrane and process for producing the same
  • Semipermeable composite membrane and process for producing the same

Examples

Experimental program
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Effect test

Embodiment

[0106] Examples are given below to describe the present invention, but these examples do not limit the present invention in any way.

[0107] [Evaluation and measurement method]

[0108] (Determination of permeation flux and salt rejection)

[0109] The prepared flat-membrane composite semipermeable membrane was cut into a predetermined shape and size, and placed in a cell for flat-membrane evaluation. For an aqueous solution containing about 1500 mg / L of NaCl and adjusted to pH 6.5 to 7.5 with NaOH, a differential pressure of 1.5 MPa is applied to the supply side and the permeation side of the membrane at 25°C to bring it into contact with the membrane. Measure the permeation velocity and conductivity of the permeated water obtained by this operation, and calculate the permeation flux (m 3 / m 2 • d) and salt rejection (%). For the salt rejection rate, the correlation (calibration curve) between the NaCl concentration and the conductivity of the aqueous solution was create...

manufacture example 1

[0120] (production of porous support)

[0121] 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

[0123] 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 .

[0124] 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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Abstract

The object of the present invention is to provide a composite semipermeable membrane with excellent water permeability and salt rejection rate and very little unreacted polyfunctional amine component in the membrane and its manufacturing method. On the surface of the body, a surface layer containing a polyamide resin formed by interfacial polymerization of the polyfunctional amine component and the polyfunctional acid halide component is formed, and it is characterized in that after the surface layer is formed, the unreacted polyfunctional amine component The content of the unreacted polyfunctional amine component after membrane cleaning treatment is less than 20mg / m2, and the content of the unreacted multifunctional amine component is less than 20mg / m2.

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 Patents(China)
IPC IPC(8): B01D71/56B01D69/12
Inventor 小原知海原田千秋井上彻雄仓田直记小西贵久釜田卓待永广宣
Owner NITTO DENKO CORP