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Composite nanofiltration membrane with high performance as well as preparation method and application of composite nanofiltration membrane

A composite nanofiltration membrane, high-performance technology, applied in the field of material technology and water treatment, can solve problems such as increasing application costs, and achieve the effects of reducing energy consumption costs, easy to scale up production, and improving cross-linking density

Pending Publication Date: 2021-05-07
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high use concentration of SDS makes it possible to pollute in the discharge process, and also greatly increases the application cost. Moreover, although the interception efficiency and flux of the nanofiltration membrane are improved at 1CMC value, 1CMC is not the best. Under the best conditions, there is still a lot of room for improvement in its performance

Method used

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  • Composite nanofiltration membrane with high performance as well as preparation method and application of composite nanofiltration membrane
  • Composite nanofiltration membrane with high performance as well as preparation method and application of composite nanofiltration membrane
  • Composite nanofiltration membrane with high performance as well as preparation method and application of composite nanofiltration membrane

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preparation example Construction

[0050]As another aspect of the technical solution of the present invention, it also relates to a method of preparing a composite nanofiltration membrane having a high performance, comprising:

[0051]A aqueous solution containing a polyvine monomer, an organic solution comprising a polycyl chloride monomer and a surfactant, wherein the surfactant comprises an oil-soluble anionic surfactant containing two hydrophobic carbon chains;

[0052]The surface of the bottom film is supported by a porous ultrafiltration, the an aqueous solution of the polyvine monomer and the interface of the organic solution, and the polycyloyl chloride monomer and the surfactant molecule are collected at the interface through electrostatic interaction, and the The multi-amine monomer and the polycyloyl chloride monomer perform interface polymerization under the interface of the surfactant, thereby forming a dense polyamide selection separation layer on the surface of the porous ultrafiltration support. To obtain a...

Embodiment 1

[0083]Piperazine (PIP) is dissolved in a pure anhydrous solution, and a piperazine aqueous solution is equipped with a concentration of 2.5 g / L; a phosphate molecule molecule is mounted to a solution having a concentration of 0.6 g / L, and then uses a phosphoric acid. The butyl ester solution dissolves the hexanoyl chloride monomer, which is formulated into an acid chloride solution having a concentration of 2 g / L. After the temperature of 25 ° C, the relative humidity is 60%, the sulfonated polysulfone ultrafiltration under film is submerged from the surface of 100s, and the film surface solution is sued into an unacceptable water stain. Then, the membrane surface was subjected to a concentration of 2 g / l to the reaction 30s, and then the film was soaked to wash the surface residual adipanoyl chloride monomer in n-hexane. Finally, the film was placed in an oven, and after heat treatment at 50 ° C for 40 min, it was stored in the refrigerator with deionized water.

[0084]After ...

Embodiment 2

[0086]Subhandylenediamine is dissolved in a pure anhydrous solution, and the aqueous phenylenediamine solution having a concentration of 5 g / L; a solution of dibutyl phosphate molecules into a concentration of 0.2 g / L, and then use phosphoric acid The butyl ester solution dissolves the p-phenanthaloyl chloride (TMC) monomer, and the acid chloride solution having a concentration of 3 g / L. After the temperature of 25.5 ° C, the relative humidity is 55%, the polyether sulfone ultrafiltration under film is submerged after the surface 90s of the surface 90s, and the film surface solution is sued into an unacceptable water stain. Then, the film surface was subjected to a phosphomethal chloride / phosphate solution of a concentration of 3 g / L, and then the film was soaked to wash the surface residual xylbenzene chloride monomer in n-hexane 30s. Finally, the film was placed in an oven, and after 30 min at 60 ° C for 30 min, it was stored in the refrigerator with deionized water.

[008...

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Abstract

The invention discloses a high-performance composite nanofiltration membrane as well as a preparation method and application thereof. The composite nanofiltration membrane comprises a porous ultrafiltration supporting bottom membrane and a polyamide selective separation layer arranged on the porous ultrafiltration supporting bottom membrane, wherein the polyamide selective separation layer is mainly formed by interfacial polymerization reaction of a polyamine monomer and a polyacyl chloride monomer under the control of a surfactant, and the surfactant comprises an oil soluble anionic surfactant containing two hydrophobic carbon chains. The preparation method comprises the following steps: carrying out interfacial polymerization reaction on the polyamine monomer and the polyacyl chloride monomer under the regulation and control of the surfactant so as to form a compact polyamide selective separation layer on the surface of a porous ultrafiltration supporting bottom membrane, and carrying out post-treatment, thereby obtaining the composite nanofiltration membrane. The high-performance composite nanofiltration membrane disclosed by the invention shows excellent interception performance on divalent anions and cations, has pure water flux of up to 16 L / m<2> / h / bar or above, and has wide application prospects in the field of water treatment.

Description

Technical field[0001]The present invention relates to a nanofiltration membrane, and more particularly to a high-performance film composite nanofiltration membrane and a preparation method thereof, and the application of the film composite nanofiltration membrane, which belongs to material technology and water treatment technology.Background technique[0002]With global warming, population increase and economy playing such factors, humans have increased dramatically with water quality and water volume, global water shortages and water pollution, potentially threatening human health and social development, water resources problems solve. Compared with traditional water treatment techniques, such as distillation, electrodialysis, oxidation and flocculation, membrane separation techniques have great application prospects in the field of water treatment due to its advantages of high separation efficiency, low energy consumption and environmental protection. The pore diameter of the nanofi...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D61/00B01D69/10B01D67/00B01D65/10C02F1/44C02F103/08C02F101/20C02F103/34
CPCB01D69/12B01D69/125B01D61/027B01D69/10B01D69/105B01D67/0079C02F1/442B01D65/10B01D2323/50C02F2103/08C02F2103/34C02F2101/20Y02A20/131
Inventor 张若琳靳健朱玉长
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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