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A kind of nanofiltration membrane and its preparation method and application

A nanofiltration membrane and support layer technology, applied in the field of nanofiltration membranes, can solve problems such as desalination rate and poor water permeability, and achieve high water flux and excellent acid and alkali corrosion resistance

Active Publication Date: 2016-08-10
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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  • A kind of nanofiltration membrane and its preparation method and application
  • A kind of nanofiltration membrane and its preparation method and application
  • A kind of nanofiltration membrane and its preparation method and application

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preparation example Construction

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

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

[0044] The positively charged support layer is sequentially and alternately contacted with the solution containing the anionic polymer and the solution containing the cationic polymer at least once to form at least one layer on the positively charged support layer including polyanions stacked in sequence The separation layer between the polycation layer and the polycation layer, wherein ...

Embodiment 1

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

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

Embodiment 2

[0078] This embodiment 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%; the sulfonated polyaryl ether sulfone 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 ion exchange capacity is 1.37mmol / g) dissolved in a mixed solution composed of N,N-dimethylformamide and water, and formulated into a solution containing an anionic polymer with a mass concentration of 0.2%.

[0080] The polyacrylonitrile ultrafiltration membrane was soaked in a NaOH aqueous solution with a concentration of 5 wt% for 3 hours to hydrolyze the cyano groups into carboxyl groups. Fix the treated polyacrylonitrile ultrafiltration membrane in a PTFE membrane tool with the me...

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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, the nanofiltration membrane prepared by the method, and the 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 range of nanofiltration membranes is about a few nanometers, and the removal of monovalent ions and organics with molecular weights less than 200 is poor. Valence or multivalent 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, sea water softening, and the classification, purification and concentration of chemical products such as dyes, antibiotics, peptides, and polysaccharides. ...

Claims

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Application Information

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Patent Type & Authority Patents(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