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Compact chlorine-resistant composite nano-filtration membrane preparation method

A composite nanofiltration membrane and compact technology, which is applied in the field of preparation of compact chlorine-resistant composite nanofiltration membranes, can solve the problems of inability to continue to use, destroy the nanofiltration membrane, damage, etc., so as to ensure the tolerance performance and high interception performance. Effect

Inactive Publication Date: 2018-04-13
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In actual use, in order to achieve the effect of cleaning the water source and reducing membrane biofouling, the front end of the membrane separation device will use sodium hypochlorite to sterilize the influent water, and the active chlorine introduced will cause irreversible damage to the polyarylamide nanofiltration membrane structure. The damage of the film makes the performance of the membrane decline rapidly and cannot continue to be used.
Therefore, in order to prolong the service life of the nanofiltration membrane, the influent water needs to be dechlorinated after disinfection to meet the requirement that the residual chlorine content in the influent water is less than 0.1ppm. Be careful and make the residual active chlorine too high to damage the risk of nanofiltration membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First, the polysulfone microporous membrane composed of non-woven fabric and polysulfone support layer is immersed in the aqueous solution containing 0.5wt% piperazine, and the excess solution on the surface is removed with a rubber roller. The organic phase solution of % trimesoyl chloride was contacted for 40 seconds, and after removing excess solution on the surface with a rubber roller, it was again contacted with an aqueous solution containing 0.5wt% polyvinyl alcohol for 1 minute, and finally heat-treated in an oven at 80°C for 5 minutes to obtain Compact chlorine-resistant composite nanofiltration membrane.

[0021] Under the conditions of NaCl concentration of 500mg / l, pressure of 0.5MPa, temperature of 25°C, and pH value of 7.0 to 8.0, the inorganic salt removal rate and permeation flux of the composite nanofiltration membrane were tested; the resistance of the composite nanofiltration membrane Chlorine performance is evaluated by testing the separation perform...

Embodiment 2

[0023] First, the polysulfone microporous membrane composed of non-woven fabric and polysulfone support layer is immersed in the aqueous solution containing 0.5wt% piperazine, and the excess solution on the surface is removed with a rubber roller. The organic phase solution of % trimesoyl chloride was contacted for 40 seconds, and after removing excess solution on the surface with a rubber roller, it was again contacted with an aqueous solution containing 1.0wt% polyvinyl alcohol for 1 minute, and finally heat-treated in an oven at 80°C for 5 minutes to obtain Compact chlorine-resistant composite nanofiltration membrane.

[0024] Under the conditions of NaCl concentration of 500mg / l, pressure of 0.5MPa, temperature of 25°C, and pH value of 7.0 to 8.0, the inorganic salt removal rate and permeation flux of the composite nanofiltration membrane were tested; the resistance of the composite nanofiltration membrane Chlorine performance is evaluated by testing the separation perform...

Embodiment 3

[0026] First, the polysulfone microporous membrane composed of non-woven fabric and polysulfone support layer is immersed in the aqueous solution containing 0.5wt% piperazine, and the excess solution on the surface is removed with a rubber roller. The organic phase solution of % trimesoyl chloride was contacted for 40 seconds, and after removing excess solution on the surface with a rubber roller, it was again contacted with an aqueous solution containing 1.0wt% sodium carboxymethylcellulose for 1 minute, and finally heat-treated in an oven at 80°C for 5 Minutes to obtain a compact chlorine-resistant composite nanofiltration membrane.

[0027] Under the conditions of NaCl concentration of 500mg / l, pressure of 0.5MPa, temperature of 25°C, and pH value of 7.0 to 8.0, the inorganic salt removal rate and permeation flux of the composite nanofiltration membrane were tested; the resistance of the composite nanofiltration membrane Chlorine performance is evaluated by testing the sepa...

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Abstract

The invention relates to a compact chlorine-resistant composite nano-filtration membrane and a preparation method thereof, wherein the compact chlorine-resistant composite nano-filtration membrane comprises a non-woven fabric, a polysulfone support layer and a chlorine-resistant separation layer. According to the present invention, the polypiperazine amide nano-filtration membrane with excellent chlorine resistance is prepared by selecting conventional piperazine / trimesoyl chloride interfacial polymerization, and the compact separation layer with excellent chlorine resistance is formed by using the reaction between the residual acyl chloride at the initial stage of the interfacial polymerization and a hydroxyl-containing macromolecule membrane material with excellent chlorine resistance; the selected membrane materials are chlorine resistant, such that the prepared nano-filtration membrane integrates the high inorganic salt removal rate of the conventional poly aromatic amide compositenano-filtration membrane and the excellent sodium hypochlorite tolerance of the conventional polypiperazine amide composite nano-filtration membrane; and the production method is simple, and the prepared compact chlorine-resistant composite nano-filtration membrane is suitable for wastewater treatment and other fields.

Description

technical field [0001] The invention relates to a preparation method of a compact chlorine-resistant composite nanofiltration membrane, which belongs to the technical field of separation membrane preparation. The composite nanofiltration membrane has the characteristics of high desalination rate, large water production, and excellent chlorine resistance performance, and is suitable for reuse of reclaimed water , wastewater treatment and drinking water purification and other fields. Background technique [0002] Nanofiltration is a pressure-driven membrane separation technology whose performance is between ultrafiltration and reverse osmosis. Its research began in the late 1970s. Different from ultrafiltration and reverse osmosis, the separation mechanism of nanofiltration is based on the charging effect in addition to the nano-scale microporous sieving effect. Repels the ions in the solution with the same charge as the membrane, so it has a high selective separation. The p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D61/00B01D67/00B01D71/56C02F1/44
CPCB01D61/027B01D67/0006B01D69/12B01D2325/30C02F1/442
Inventor 俞三传吕振华刘梅红
Owner ZHEJIANG SCI-TECH UNIV
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