Chlorine-resistant reverse osmosis composite membrane and preparation method thereof

A reverse osmosis composite membrane, chlorine-resistant technology, applied in the direction of reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of shortened life, increased operating costs, and reduced membrane performance, so as to improve the service life and excellent Chlorine resistance, effect of reducing attack sites

Active Publication Date: 2018-12-14
HANGZHOU FANGRAN MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Active chlorine will cause great damage to the structure of the polyamide reverse osmosis membrane, causing a rapid decline in membrane performance and shortened life.
Therefore, in practical applications, the influent water of the reverse osmosis equipment needs to be dechlorinated after disinfection to meet the requirement that the residual chlorine content in the influent water is less than 0.1ppm. This type of operation significantly increases the operating cost

Method used

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  • Chlorine-resistant reverse osmosis composite membrane and preparation method thereof
  • Chlorine-resistant reverse osmosis composite membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Immerse the polysulfone microporous membrane in an m-phenylenediamine aqueous solution with a mass percentage of m-phenylenediamine of 2%, take it out, remove the excess solution on the surface with a rubber roller, and then immerse it in an aqueous solution with a mass percentage of trimesoyl chloride. Take it out after at least 1 min in the n-hexane tricarboxylic acid chloride solution, heat treatment at 75°C for 5 min, and form an aromatic polyamide separation layer on the surface of the polysulfone microporous membrane; then immerse the polysulfone microporous membrane with the aromatic polyamide separation layer on the surface Activate in an aqueous solution of formaldehyde with a mass percentage of 0.1%, after activation, immerse in an aqueous solution of polyvinyl alcohol with a mass percentage of 0.2% for at least 5min, take it out and dry it in the shade, and then immerse it in a glyoxal with a mass percentage of 1 % glyoxal aqueous solution for at least 1 min, ...

Embodiment 2

[0025] Immerse the polysulfone microporous membrane in an m-phenylenediamine aqueous solution with a mass percentage of m-phenylenediamine of 2.5%, take it out, remove the excess solution on the surface with a rubber roller, and then immerse it in an aqueous solution with a mass percentage of trimesoyl chloride of 1.5%. Take it out after at least 1min in the n-hexane tricarboxylic acid chloride solution, heat treatment at 80°C for 4min, and form an aromatic polyamide separation layer on the surface of the polysulfone microporous membrane; then immerse the polysulfone microporous membrane with the aromatic polyamide separation layer on the surface Activate in an aqueous solution of acetaldehyde with a mass percentage of 0.6%. After activation, immerse in an aqueous solution of sodium alginate with a mass percentage of 0.5% for at least 5 minutes. Take it out after 1.2% glutaraldehyde aqueous solution for at least 1 min, heat treatment at 80°C for 4 min, cross-link on the surface...

Embodiment 3

[0027] Immerse the polysulfone microporous membrane in an m-phenylenediamine aqueous solution with a mass percentage of m-phenylenediamine of 3%, take it out, remove the excess solution on the surface with a rubber roller, and then immerse it in an aqueous solution with a mass percentage of trimesoyl chloride. Take it out after at least 1 min in the n-hexane tricarboxylic acid chloride solution, heat treatment at 85°C for 3 min, and form an aromatic polyamide separation layer on the surface of the polysulfone microporous membrane; then immerse the polysulfone microporous membrane with the aromatic polyamide separation layer on the surface Activation is carried out in an aqueous solution of propionaldehyde with a mass percentage of 5% propionaldehyde, after activation, immersed in an aqueous solution of sodium lignosulfonate with a mass percentage of 0.2% sodium lignosulfonate for at least 5 minutes, taken out and dried in the shade, then immersed in glutaraldehyde Take it out f...

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Abstract

The invention discloses a chlorine-resistant reverse osmosis composite membrane and a preparation method thereof. The method is characterized in that an aromatic polyamide separation layer is formed on the surface of a polysulfone microporous membrane by reacting m-phenylenediamine and trimesoyl chloride, an aldehyde compound is used to activate the aromatic polyamide separation layer, the activechlorine attack site is reduced, and a reactive group hydroxyl group is introduced, which provides a basis for fixing the chlorine-resistant protective layer in the form of chemical bonds in a later stage; a hydroxyl group-containing chlorine-resistant polymer material is fixed to the surface of the aromatic polyamide separation layer by a cross-linking agent by means of solvent evaporation and chemical crosslinking to form the chlorine-resistant protective layer, and finally the chlorine-resistant reverse osmosis composite membrane is obtained. The process is simple, and the operationality isstrong.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a chlorine-resistant reverse osmosis composite membrane and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy, the increase of population and the acceleration of industrialization and urbanization, the urban water consumption and sewage discharge have increased sharply, which has exacerbated the shortage of water resources and the deterioration of the water environment. Environmental problems have restricted the development of the regional economy, and wastewater reuse is an important way to solve the water crisis. However, the level of wastewater reuse in China is currently low, and increasing the level of reuse is of great significance to the sustainable use of water resources and the protection of the water environment. [0003] As the "water purification technology of the 21st century", reverse osmosis separ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D69/12B01D67/00C02F1/44
CPCB01D61/025B01D67/0006B01D69/12C02F1/441
Inventor 丁国良赵经纬吕振华王炎锋
Owner HANGZHOU FANGRAN MEMBRANE TECH
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