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Nanofiltration membrane as well as preparation method and application thereof

A nanofiltration membrane and support layer technology, applied in the field of nanofiltration membranes, can solve the problems of salt rejection and poor water permeability, and achieve the effects of high water flux and excellent acid and alkali corrosion resistance.

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of poor salt rejection and water permeability of the existing sulfonated polyarylethersulfone nanofiltration membranes, and provide a membrane with excellent salt rejection, water permeability and acid and alkali corrosion resistance. Nanofiltration membrane, a preparation method of nanofiltration membrane, the nanofiltration membrane prepared by the method and the application of the nanofiltration membrane in the field of water treatment

Method used

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  • Nanofiltration membrane as well as preparation method and application thereof
  • Nanofiltration membrane as well as preparation method and application thereof
  • Nanofiltration membrane as well as preparation method and application thereof

Examples

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preparation example Construction

[0042] The preparation method of nanofiltration membrane provided by the invention comprises:

[0043] The negatively charged support layer is sequentially and alternately contacted at least once with a solution containing a cationic polymer and a solution containing an anionic polymer to form at least one layer on the negatively charged support layer comprising sequentially stacked polycation layers and The separation layer of the polyanionic layer, wherein the anionic polymer is a sulfonated polyarylethersulfone having a structure represented by formula (I) and / or formula (II); or,

[0044] The positively charged support layer is sequentially and alternately contacted at least once with a solution containing an anionic polymer and a solution containing a cationic polymer to form at least one layer comprising sequentially stacked polyanions on the positively charged support layer. layer and the separation layer of the polycation layer, wherein the anionic polymer is a sulfona...

Embodiment 1

[0073] This example is used to illustrate the nanofiltration membrane provided by the present invention and its preparation method.

[0074] Chitosan quaternary ammonium salt (purchased from Nantong Lvshen Biological Engineering Co., Ltd., brand NACC) was dissolved in deionized water to prepare a solution containing a cationic polymer with a mass concentration of 0.2%; the sulfonated polyarylether Sulfone C-SPAES (purchased from Tianjin Yanjin Technology Co., Ltd., has the structure shown in formula (Ⅲ), R 1 -R 15 H, m is 60, ion exchange capacity is 1.49mmol / g) dissolved in the mixed solution of N,N-dimethylformamide and water (the volume ratio of N,N-dimethylformamide and water is 1:100, the same below), prepared into a solution containing anionic polymer with a mass concentration of 0.2%.

[0075] The polyacrylonitrile ultrafiltration membrane (purchased from Hangzhou Meiyi Membrane Technology Co., Ltd., with a thickness of 125um, the same below) was soaked in NaOH aqueou...

Embodiment 2

[0078] This example is used to illustrate the nanofiltration membrane provided by the present invention and its preparation method.

[0079] Polyaniline (purchased from Bailingwei Technology Co., Ltd., brand 81303) was dissolved in deionized water to prepare a solution containing a cationic polymer with a mass concentration of 0.2%; sulfonated polyarylethersulfone C-SPAES (purchased from Tianjin Yanjin Technology Co., Ltd. has the structure shown in formula (Ⅲ), R 1 -R 15 is H, m is 80, and the ion exchange capacity is 1.37mmol / g) is dissolved in a mixed solution of N,N-dimethylformamide and water to prepare a solution containing an anionic polymer with a mass concentration of 0.2%.

[0080] Soak the polyacrylonitrile ultrafiltration membrane in NaOH aqueous solution with a concentration of 5% by weight for 3 hours to hydrolyze the cyano groups into carboxyl groups. Fix the treated polyacrylonitrile ultrafiltration membrane in the tetrafluoromembrane with the membrane facing...

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Abstract

The invention provides a nanofiltration membrane, a preparation method of the nanofiltration membrane, and an application of the nanofiltration membrane prepared with the method in the water treatment field. The nanofiltration membrane comprises an electronegative support layer and at least one separation layer located on the surface of the support layer, wherein the separation layers comprise polycationic layers and polyanionic layers which are sequentially laminated; the polycationic layers are contacted with the support layer; or the nanofiltration membrane comprises an electropositive support layer and at least one separation layer located on the surface of the support layer; the separation layers comprise polyanionic layers and polycationic layers which are sequentially laminated; the polyanionic layers are contacted with the support layer; and an anionic polymer in each polyanionic layer is sulfonated poly ether sulfone with the structure as shown as Formula (I) and / or Formula (II) as shown in the specification. The nanofiltration membrane has excellent desalinization ratio, water permeability and acid-alkali corrosion resistance, and has a good industrial application prospect.

Description

technical field [0001] The invention relates to a nanofiltration membrane, a preparation method of the nanofiltration membrane, a nanofiltration membrane prepared by the method and an application of the nanofiltration membrane in the field of water treatment. Background technique [0002] Nanofiltration is a pressure-driven membrane separation process between reverse osmosis and ultrafiltration. The pore size of the nanofiltration membrane is in the range of several nanometers, and the removal of monovalent ions and organic compounds with a molecular weight less than 200 is poor. Valence or polyvalent ions and organic matter with a molecular weight between 200-500 have a higher removal rate. It can be widely used in water softening, drinking water purification, water quality improvement, oil-water separation, wastewater treatment and reuse, seawater softening, and the classification, purification and concentration of dyes, antibiotics, polypeptides, polysaccharides and other...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D67/00C02F1/44
CPCY02A20/131
Inventor 张杨刘轶群潘国元郭敏严昊
Owner CHINA PETROLEUM & CHEM CORP
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