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Amphiphilic charge polyacrylonitrile tubular composite nanofiltration membrane and preparation method thereof

A polyacrylonitrile tubular, composite nanofiltration membrane technology, which is applied in chemical instruments and methods, membranes, ultrafiltration, etc., can solve the problems of reducing the filtration process, and the single anion and cation interception of the composite nanofiltration membrane, so as to improve the rejection rate , The effect of simplifying the preparation method

Inactive Publication Date: 2018-08-31
长兴科创科技咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to overcome the problem of single anion and cation interception in the composite nanofiltration membrane in the prior art, and provide a tubular composite nanofiltration membrane capable of simultaneously intercepting anions and cations, reducing the filtration process and reducing the production cost of amphoterically charged polypropylene Nitrile tubular composite nanofiltration membrane

Method used

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  • Amphiphilic charge polyacrylonitrile tubular composite nanofiltration membrane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0026] An amphoterically charged polyacrylonitrile tubular composite nanofiltration membrane, comprising a polyacrylonitrile tubular ultrafiltration base membrane, the average pore diameter of the polyacrylonitrile tubular ultrafiltration base membrane is 0.06 microns, and the polyacrylonitrile tubular ultrafiltration base membrane The outer surface of the filter base membrane is covered with a cation selective separation layer, which is prepared by interfacial polymerization of trimesoyl chloride and polyethylene polyamine, and the inner surface of the polyacrylonitrile tubular ultrafiltration base membrane is covered with There is an anion selective separation layer, the anion selective separation layer contains modified zeolite, and the anion selective separation layer is prepared by interfacial polymerization of trimesoyl chloride and triaminobenzene.

[0027] Wherein, the preparation method of the modified zeolite is: adding 4 parts by weight of zeolite and 1 part by weigh...

Embodiment 2

[0035] An amphoterically charged polyacrylonitrile tubular composite nanofiltration membrane, comprising a polyacrylonitrile tubular ultrafiltration base membrane, the average pore diameter of the polyacrylonitrile tubular ultrafiltration base membrane is 0.07 microns, and the polyacrylonitrile tubular ultrafiltration base membrane The outer surface of the filter base membrane is covered with a cation selective separation layer, which is prepared by interfacial polymerization of trimesoyl chloride and polyethylene polyamine, and the inner surface of the polyacrylonitrile tubular ultrafiltration base membrane is covered with There is an anion selective separation layer, the anion selective separation layer contains modified zeolite, and the anion selective separation layer is prepared by interfacial polymerization of trimesoyl chloride and triaminobenzene.

[0036] Wherein, the preparation method of the modified zeolite is: adding 4.2 parts by weight of zeolite and 1.3 parts by ...

Embodiment 3

[0044] An amphoterically charged polyacrylonitrile tubular composite nanofiltration membrane, comprising a polyacrylonitrile tubular ultrafiltration base membrane, the average pore diameter of the polyacrylonitrile tubular ultrafiltration base membrane is 0.08 microns, and the polyacrylonitrile tubular ultrafiltration base membrane The outer surface of the filter base membrane is covered with a cation selective separation layer, which is prepared by interfacial polymerization of trimesoyl chloride and polyethylene polyamine, and the inner surface of the polyacrylonitrile tubular ultrafiltration base membrane is covered with There is an anion selective separation layer, the anion selective separation layer contains modified zeolite, and the anion selective separation layer is prepared by interfacial polymerization of trimesoyl chloride and triaminobenzene.

[0045] Wherein, the preparation method of the modified zeolite is: adding 4.5 parts by weight of zeolite and 1.4 parts by ...

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Abstract

The invention relates to the technical field of water treatment environmental protection, and discloses an amphiphilic charge polyacrylonitrile tubular composite nanofiltration membrane and a preparation method thereof. The tubular composite nanofiltration membrane comprises a polyacrylonitrile tubular ultrafiltration base membrane, the outer surface of the polyacrylonitrile tubular ultrafiltration base membrane is covered with a cation selective separation layer, the cation selective separation layer is prepared by using trimesoyl chloride and polyethylene polyamine through interfacial polymerization, the inner surface of the polyacrylonitrile tubular ultrafiltration base membrane is covered with an anion selective separation layer, and the anion selective separation layer is prepared byusing trimesoyl chloride and benzenetriamine through interfacial polymerization. The tubular composite nanofiltration membrane can simultaneously retain high-priced anions and cations, and simplify the filtration process, and the retention effect and water flux of the nanofiltration membrane are improved by adding modified zeolite to the anion selective separation layer.

Description

technical field [0001] The invention relates to the technical field of water treatment and environmental protection, in particular to an amphoterically charged polyacrylonitrile tubular composite nanofiltration membrane capable of simultaneously intercepting anions and cations and a preparation method thereof. Background technique [0002] The pore size or separation accuracy of the nanofiltration membrane is between ultrafiltration and reverse osmosis, the interception of molecules is between 200 and 1000Da, and the pore size of the membrane is about 1 nanometer, which can be used to separate small molecular organic substances and ions , and has the characteristics of low operating pressure and low energy consumption. At present, nanofiltration membranes have been widely used in sewage treatment, water softening, and separation and purification processes in food, dye and other industries. Compared with chemical treatment methods, physical filtration methods are environmenta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D61/14B01D69/08B01D71/42C02F1/44C02F1/28C02F101/20
CPCB01D69/125B01D61/145B01D69/08B01D69/12B01D71/42B01D2325/12B01D2325/18B01D2325/36C02F1/281C02F1/444C02F2101/20
Inventor 赵志云
Owner 长兴科创科技咨询有限公司