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Hollow fiber composite nanofiltration membrane and preparation method thereof

A fiber composite and nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low flux, limited packing density, and low permeation flux of hollow fiber composite nanofiltration membranes , to achieve excellent separation efficiency and pollution resistance, improved hydrophilicity, and high filtration accuracy

Active Publication Date: 2021-11-12
BEIJING SCINO MEMBRANCE TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of low permeation flux, limited packing density, and intolerant to pollution of the existing roll-type composite nanofiltration membranes, as well as the low flux of the existing hollow fiber composite nanofiltration membranes prepared by interfacial polymerization, this application provides A hollow fiber nanofiltration membrane with simple preparation method, strong rejection rate and high flux and its preparation method

Method used

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  • Hollow fiber composite nanofiltration membrane and preparation method thereof
  • Hollow fiber composite nanofiltration membrane and preparation method thereof
  • Hollow fiber composite nanofiltration membrane and preparation method thereof

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preparation example Construction

[0039] The application provides a method for preparing a hollow fiber composite nanofiltration membrane, comprising the following steps:

[0040] The hollow fiber ultrafiltration membrane was prepared by composite heat-induced phase separation method, and the hollow fiber composite nanofiltration membrane was finally prepared by using the chelation-assisted surface coating method with the prepared hollow fiber ultrafiltration membrane as the base membrane.

[0041] Further, the specific steps of the composite thermal phase separation method are as follows:

[0042] The hollow fiber casting solution is prepared from polyvinylidene fluoride (PDVF), polyacrylonitrile (PAN), solvent and additives, and the hollow fiber casting solution is subjected to standing defoaming and spinning to obtain a hollow fiber ultrafiltration membrane.

[0043] Furthermore, the solvent is N,N-dimethylacetamide, N,N-dimethylformamide, N-methylpyrrolidone, γ-butyrolactone, triethyl phosphate, dimethyl ...

Embodiment 1

[0084] A hollow fiber composite nanofiltration membrane is prepared by the following steps:

[0085] (1) 25wt.% polyvinylidene fluoride, 4wt.% polyacrylonitrile, and 70wt.% N,N-dimethylacetamide, 1wt.% polyvinylpyrrolidone according to polyvinylidene fluoride: polypropylene Add nitrile:solvent:additive=20:1:70:3 mass ratio into the reaction kettle, stir at 90°C for 8 hours to form a uniform hollow fiber casting solution;

[0086] (2) Then stop stirring the dissolved hollow fiber casting solution and let it stand for 8 hours to remove the residual air bubbles in the casting solution, feed nitrogen into the reactor and pressurize to 0.1MPa, and then apply 20kPa to the core solution tank The core liquid passes through the inner circular hole of the spinneret, and the hollow fiber casting liquid passes through the annular hole in the middle of the spinneret, and the hollow fiber ultrafiltration membrane is formed by phase separation under the combined action of the gel bath;

[0...

Embodiment 2

[0093] A hollow fiber composite nanofiltration membrane is prepared by the following steps:

[0094](1) 30wt.% polyvinylidene fluoride, 3wt.% polyacrylonitrile, and 66wt.% N,N-dimethylformamide, 1wt.% polysorbate-80 according to polyvinylidene fluoride: Add polyacrylonitrile: solvent: additive = 10:1:66:5 mass ratio into the reactor, and stir at 100°C for 4 hours to form a uniform hollow fiber casting solution;

[0095] (2) Then stop stirring the dissolved hollow fiber casting solution and let it stand for 12 hours to remove the residual air bubbles in the casting solution, feed nitrogen into the reactor and pressurize to 0.15MPa, and then apply 40kPa to the core solution tank The core liquid passes through the inner circular hole of the spinneret, and the hollow fiber casting liquid passes through the annular hole in the middle of the spinneret, and the hollow fiber ultrafiltration membrane is formed by phase separation under the combined action of the gel bath;

[0096] (3)...

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Abstract

The invention relates to the technical field of separation membrane preparation, in particular to a hollow fiber composite nanofiltration membrane and a preparation method thereof. The method comprises the following steps: preparing a hollow fiber ultrafiltration membrane by adopting a composite thermally induced phase separation method, and finally preparing the hollow fiber composite nanofiltration membrane by taking the prepared hollow fiber ultrafiltration membrane as a base membrane and adopting a chelating auxiliary surface coating method. The chelating auxiliary surface coating method used in the invention has the advantages of mild reaction, environmental friendliness and easiness in operation. According to the prepared hollow fiber composite nanofiltration membrane, the permeation flux of the membrane is close to 6 times that of a polyamide hollow fiber composite nanofiltration membrane formed by a traditional interfacial polymerization method on the premise that the retention rate of dye is basically unchanged, the application is expected to be applied to the field of printing and dyeing wastewater treatment, and a new generation of high-flux composite nanofiltration membranes is provided.

Description

technical field [0001] The invention relates to the technical field of separation membrane preparation, in particular to a hollow fiber composite nanofiltration membrane and a preparation method thereof. Background technique [0002] As a world-renowned textile power, my country's textile industry has experienced rapid development in recent years, and the usage rate of various textile dyes has also shown an increasing trend year by year, resulting in a large amount of printing and dyeing wastewater discharge and environmental pollution. In addition, printing and dyeing wastewater also contains some residual compounds, such as inorganic salts. How to separate dyes and inorganic salts has become an urgent technical problem in the printing and dyeing industry. Traditional methods for treating printing and dyeing wastewater include oxidation, precipitation, and adsorption. However, these processes consume a large amount of chemical reagents, which easily cause secondary pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D69/12B01D67/00B01D61/02
CPCB01D69/08B01D69/125B01D67/0011B01D67/0088B01D67/0093B01D61/027Y02A20/131
Inventor 张景隆张超白鹤李宁宁刘钦刘治国王晶晶冯敏曲宏斌
Owner BEIJING SCINO MEMBRANCE TECH
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