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Polyamide composite membrane chlorine-resistant high-flux modification method based on ketone free radicals

A free radical, polyamide technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of energy consumption and cost reduction of nanofiltration and reverse osmosis technology, maintain salt retention efficiency, improve Chlorine resistance, easy operation effect

Inactive Publication Date: 2022-04-12
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, the existence of the trade-off effect between the permeability performance and the separation performance in the development of high-flux polyamide composite membranes makes the research and development of high-flux reverse osmosis membranes a bottleneck for a long time, and the energy consumption of nanofiltration and reverse osmosis technologies Therefore, while maintaining the separation performance of the membrane material, improving the permeability performance of the membrane material, and developing polyamide composite membranes with high flux and good chlorine resistance are the current focus of attention in the field of reverse osmosis technology. It is of great significance to the development and progress of reverse osmosis technology

Method used

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  • Polyamide composite membrane chlorine-resistant high-flux modification method based on ketone free radicals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Select the polyamide composite reverse osmosis membrane from Dow Filmtec Company in the United States, immerse it in the modification solution, and modify it at 40°C for 1h. The modification solution includes: 300 mg / L ammonium persulfate, 50% (v / v) acetone, 50% (v / v) water. After the modified solution was preheated to 40°C, the polyamide composite membrane was added, and the membrane was taken out after 1 hour of modification, and the modified membrane was fully cleaned with water before testing.

[0023] The membrane that was not treated with the modifying solution was the comparative membrane.

[0024] The test conditions of water flux and salt rejection rate are: operating pressure 14bar, flow rate 3LPM, pre-pressing the modified membrane and the comparison membrane with ultra-pure water at 25°C for 6h to stabilize the membrane performance, adjust the operating pressure to 10bar, and measure the modified membrane. The water flux of the permanent membrane and the co...

Embodiment 2

[0026] Select the polyamide composite reverse osmosis membrane from Zhongke Ruiyang Membrane Technology (Beijing) Co., Ltd., immerse it in the modification solution, and modify it at 50°C for 0.5h. The modification solution includes: 500 mg / L potassium hydrogen persulfate compound salt, 20% (v / v) methyl ethyl ketone, and 80% (v / v) water. After the modified solution was preheated to 50°C, the polyamide composite membrane was added, and the membrane was taken out after 2 hours of modification, and the modified membrane was fully cleaned with water before testing.

[0027] The membrane that was not treated with the modifying solution was the comparative membrane.

[0028] The test methods for water flux and salt rejection are consistent with those described in Example 1.

Embodiment 3

[0030] The polyamide composite reverse osmosis membrane independently developed by the inventor was selected, immersed in the modification solution, and modified at 60° C. for 2 hours. The modification solution includes: 200 mg / L sodium persulfate, 200 mg / L potassium hydrogen persulfate complex salt, 40% (v / v) acetone, 60% (v / v) water. After the modified solution was preheated to 60°C, polyamide composite membrane was added, and the membrane was taken out after 3 hours of modification, and the modified membrane was fully cleaned with water before testing.

[0031] The membrane that was not treated with the modifying solution was the comparative membrane.

[0032] The test methods for water flux and salt rejection are consistent with those described in Example 1.

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Abstract

The invention belongs to the technical field of organic membrane materials, and particularly relates to a polyamide composite membrane chlorine-resistant high-flux modification method based on ketone free radicals. According to the polyamide composite membrane, a polyamide active layer is modified in a free radical grafting mode, free radicals are generated by mixing a substrate and an oxidizing agent, the free radicals are ketone free radicals, the substrate is small molecule ketone with the carbon number smaller than or equal to 5, and the oxidizing agent is persulfate. According to the method, ketone free radicals are introduced to amido bonds of polyamide for the first time, due to the fact that the ketone free radicals can effectively occupy reaction active sites of chlorine and polyamide and improve the hydrophilicity of polyamide, the chlorine resistance and permeability of the membrane are improved, and in addition, the modification method is simple and easy to implement, production is easy to expand, and the method has great market prospects.

Description

technical field [0001] The invention belongs to the technical field of polyamide composite membrane water treatment, and in particular relates to a chlorine-resistant high-flux modification method of a polyamide composite membrane based on ketone radicals. Background technique [0002] At present, the world is facing the problem of water shortage. The lack of water resources means the shortage of fresh water resources. How to obtain more fresh water resources has become the main focus. At present, seawater desalination and water regeneration are effective ways to solve this problem. , and membrane technology is a necessary means to bring ideals into reality. The membrane water treatment process can guarantee higher quality effluent with relatively little impact on the environment. At present, the mainstream products of nanofiltration and reverse osmosis membrane materials are polyamide composite membranes with polyamide as the separation layer. [0003] However, polyamide ...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D69/02B01D71/56
CPCB01D69/12B01D69/02B01D71/56B01D2325/30Y02A20/131
Inventor 张涛王颢睿程巍
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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