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Anti-pollution reverse osmosis membrane and preparation method thereof

A reverse osmosis membrane, anti-pollution technology, used in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc. Effect

Active Publication Date: 2014-12-10
BEIJING ORIGIN WATER FILM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yet the PVA coating that adopts the method that CN101130444 provides is physical adsorption between the polyamide coating, there is no link of chemical bond, and the whole sheet comes off easily when the coating is damaged.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A pollution-resistant reverse osmosis membrane is made by the following method:

[0020] Water phase solution preparation: Dissolve PVA in pure water, then add m-phenylenediamine and sodium hydroxide while stirring, and stir until completely dissolved. The mass concentration of PVA in the solution is 0.2%, the mass concentration of m-phenylenediamine in the solution is 2.5%, and the mass concentration of sodium hydroxide in the solution is 0.4%.

[0021] Preparation of oil phase solution: Dissolve trimesoyl chloride in n-heptane and stir until completely dissolved. The mass concentration of trimesoyl chloride in the solution is 0.1%.

[0022] Preparation of solution A: Take a certain amount of PVA, slowly add it into pure water at a temperature of 90°C, and start stirring at a high speed when PVA is added until it is completely dissolved. The total weight concentration of PVA molecules in A solution is 0.2%.

[0023] Preparation of solution B: Dissolve a certain amou...

Embodiment 2

[0027] A pollution-resistant reverse osmosis membrane is made by the following method:

[0028] Water phase solution preparation: Dissolve PVA in pure water, then add m-phenylenediamine and sodium hydroxide while stirring, and stir until completely dissolved. The mass concentration of PVA in the solution is 0.15%, the mass concentration of m-phenylenediamine in the solution is 2.5%, and the mass concentration of sodium hydroxide in the solution is 0.4%.

[0029] Preparation of oil phase solution: Dissolve trimesoyl chloride in n-heptane and stir until completely dissolved. The mass concentration of trimesoyl chloride in the solution is 0.12%.

[0030] Preparation of solution A: Take a certain amount of PVA, slowly add it into pure water at a temperature of 90°C, and start stirring at a high speed when PVA is added until it is completely dissolved. The total weight concentration of PVA molecules in A solution is 0.2%.

[0031] Preparation of solution B: Dissolve a certain am...

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Abstract

The invention discloses an anti-pollution reverse osmosis membrane and a preparation method thereof. The anti-pollution reverse osmosis membrane comprises a non-woven fabric, a polysulfone supporting layer, a polyamide desalination layer containing polyvinyl alcohol (PVA) molecules and a PVA cross-linking coating. According to the anti-pollution reverse osmosis membrane, the PVA molecules are introduced into the polyamide desalination layer, part of hydroxyl on the PVA molecules, amino of m-phenylenediamine and acyl chloride perssad are reacted to form the polyamide desalination layer, and the rest hydroxyl and hydroxyl which is later coated on the PVA molecules jointly participate in the reaction for generating the PVA cross-linking coating so that the polyamide desalination layer and the PVA cross-linking coating are combined together through chemical bonds, and adhesion of the PVA cross-linking coating is improved. The reverse osmosis membrane has the advantages of being anti-pollution, high in flux, high in desalinization ratio and easy to prepare.

Description

technical field [0001] The invention relates to an anti-pollution reverse osmosis membrane and a preparation method thereof. Background technique [0002] Reverse osmosis is an efficient water purification method, which has the advantages of high efficiency, low cost, no phase change, easy integration, modularization and automation, etc. It is widely used in the preparation of high-purity water in the electronics industry, medical water preparation, seawater desalination, Water desalination, sewage recycling and many other fields. With the shortage of global fresh water resources and the increasingly serious water pollution, reverse osmosis technology is playing an increasingly important role in water purification. [0003] Reverse osmosis membranes face various pollutions during use, including: scaling, biological fouling, colloidal fouling, etc. Reverse osmosis faces a more serious threat of pollution in the field of sewage regeneration. For example, using the effluent o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56
Inventor 陈亦力林勇文剑平吴强李锁定
Owner BEIJING ORIGIN WATER FILM TECH
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