Polyamide composite membrane high-flux modification method based on small molecular alcohol free radicals

A technology of small molecular alcohol and polyamide, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. The effect of improving adsorption and dissolution rate, increasing membrane water flux, and uniform hydrophilic type

Active 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, the preparation of nanomaterials is complicated, the price is high, the application is limited, and it is easy to agglomerate, resulting in uneven doping; although reducing the thickness of the active layer will increase the water flux of the membrane in the early stage, it is easy to be damaged after long-term use, and it is not resistant to physical and chemical properties. Cleaning and other issues
In addition, most of the modification and preparation methods to improve the water flux of polyamide composite membranes will lose the retention effect of the membrane, that is, the improvement of water flux and salt rejection is mutually restricted.

Method used

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  • Polyamide composite membrane high-flux modification method based on small molecular alcohol free radicals
  • Polyamide composite membrane high-flux modification method based on small molecular alcohol free radicals
  • Polyamide composite membrane high-flux modification method based on small molecular alcohol free radicals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Select the polyamide composite reverse osmosis membrane from Dow Filmtech Company in the United States, immerse it in the modification solution, and modify it at 40°C for 1h. The modification solution includes: 200 mg / L ammonium persulfate, 50% (v / v) ethanol, 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.

[0026] The membrane that was not treated with the modifying solution was the comparative membrane.

[0027] The test conditions are: the operating pressure is 14bar, the flow rate is 3LPM, the modified membrane and the comparison membrane are pre-pressed with ultra-pure water for 6 hours at 25°C to stabilize the membrane performance, and the operating pressure is adjusted to 10bar to measure the water flow of the modified membrane and the comparison membrane. quantity. Pr...

Embodiment 2

[0029] 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) n-propanol, 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 0.5h of modification, and the modified membrane was fully cleaned with water before testing.

[0030] The membrane that was not treated with the modifying solution was the comparative membrane.

[0031] The test conditions are: the operating pressure is 14bar, the flow rate is 3LPM, the modified membrane and the comparison membrane are pre-pressed with ultra-pure water for 6 hours at 25°C to stabilize the membrane performance, and the operating pressure is adjusted to 10bar to measure the water flow of the modified membran...

Embodiment 3

[0033] 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 compound salt, 40% (v / v) n-butanol, 60% (v / v) water. After the modified solution was preheated to 60°C, the polyamide composite membrane was added, the membrane was taken out after 2 hours of modification, and the modified membrane was fully cleaned with water before testing.

[0034] The membrane that was not treated with the modifying solution was the comparative membrane.

[0035] The test conditions are: the operating pressure is 14bar, the flow rate is 3LPM, the modified membrane and the comparison membrane are pre-pressed with ultra-pure water for 6 hours at 25°C to stabilize the membrane performance, and the operating pressure is adjusted to 10bar to measure the water flow of the modifie...

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Abstract

The invention relates to a polyamide composite membrane high-flux modification method based on small molecule alcohol free radicals, and aims to improve the water flux of reverse osmosis and nanofiltration membranes. According to the method, the polyamide composite membrane is modified by a modification solution of alcohol free radicals generated by an oxidizing agent and a small-molecular alcohol organic matter, so that small-molecular alcohol is effectively grafted on the surface and inside of a functional layer under the conditions that the thickness of the functional layer is not reduced and the physical structure of the functional layer is not damaged, and the surface hydrophilicity of the membrane is improved; the water flux of the membrane is greatly improved, and meanwhile, the desalting effect of the membrane is maintained. The method is simple, convenient, low in cost, green and environment-friendly and can be conveniently combined with an existing membrane production line, the high-flux membrane can reduce water treatment energy consumption and reduce the use number of membrane assemblies, and the method has obvious advantages in the water treatment fields of seawater desalination, reclaimed water deep treatment, industrial wastewater zero discharge and the like.

Description

technical field [0001] The invention belongs to the technical field of polyamide composite membrane water treatment, and in particular relates to a high-flux modification method of polyamide composite membrane based on small molecule alcohol radicals. Background technique [0002] The shortage of water resources and the pollution of water environment have become one of the restrictive factors of my country's economic development, and are major problems that need to be solved urgently in social development. Membrane separation technology represented by nanofiltration and reverse osmosis has a good removal effect on dissolved organic matter and inorganic salts in water, and the physical separation process has little impact on the environment. more attention. At present, the mainstream products of nanofiltration and reverse osmosis membrane materials are composite membranes, especially polyamide composite membranes with polyamide as the separation layer, which are the mainstre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/02B01D71/56B01D61/10C02F1/44
Inventor 张涛程巍
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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