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Method for simultaneously improving flux and anti-pollution performance of polyamide reverse osmosis composite membrane

A reverse osmosis composite membrane and polyamide technology, which is applied in semipermeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problem of rough surface of polyamide reverse osmosis composite membrane, high permeability resistance of membrane materials, and mass transfer resistance of water molecules Larger and other problems, to achieve the effect of improving permeability and anti-fouling performance, avoiding membrane fouling, and increasing chemical potential

Active Publication Date: 2020-02-04
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The organic pollutants in the feed liquid mainly include oil, biological macromolecules (bovine serum albumin, etc.), natural organic matter, humic acid, polysaccharides, etc., and their molecular structures basically have hydrophobic segments. The more hydrophobic the membrane surface, the more Pollutants are more likely to be adsorbed on the surface of the membrane due to hydrophobic interaction forces, leading to organic pollution, and ultimately manifested as a rapid decrease in water production efficiency
[0005] (2) The surface of polyamide reverse osmosis composite membrane is relatively rough
However, this method has high requirements on the control of the deposition amount of hydrophilic macromolecules. Once it is excessive, the mass transfer resistance of water molecules will increase sharply. Own penetration resistance; In addition, if it is introduced by physical coating, there are still problems such as stability of hydrophilic functional materials

Method used

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  • Method for simultaneously improving flux and anti-pollution performance of polyamide reverse osmosis composite membrane
  • Method for simultaneously improving flux and anti-pollution performance of polyamide reverse osmosis composite membrane
  • Method for simultaneously improving flux and anti-pollution performance of polyamide reverse osmosis composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] S1. Dissolve 1.5g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 15g of triethanolamine and 10g of sodium phosphate in 1000ml of pure water, and use 0.1mol / l HCl solution or NaOH solution adjusts pH to 7.0, as modified solution A;

[0034] S2. Take 100g of 1,4-butane sultone and dissolve it in 1000ml of ethanol / water solution (1:1 by volume), stir it evenly and use it as modified solution B;

[0035] S3. Rinse the commercialized polyamide reverse osmosis composite membrane with pure water, soak it in the modification solution A, take it out after 5 hours and wash it with pure water;

[0036] S4. After contacting the above-mentioned S3 diaphragm with the modified solution B for 15 hours, remove the excess solution and wash it with pure water for later use.

[0037] The salt rejection rate and water flux of the polyamide reverse osmosis composite membrane were tested under the conditions of NaCl concentration of 2000mg / l, pressure of 1.55MPa, temperature o...

Embodiment 2

[0041] S1. Dissolve 1.5g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 15g of 1-(2-hydroxyethyl)piperazine and 10g of sodium phosphate in 1000ml of pure water , and use 0.1mol / l HCl solution or NaOH solution to adjust the pH to 7.0 as modified solution A;

[0042] S2. Take 100g of 1,4-butane sultone and dissolve it in 1000ml of ethanol / water solution (1:1 by volume), stir it evenly and use it as modified solution B;

[0043] S3. Rinse the commercialized polyamide reverse osmosis composite membrane with pure water, soak it in the modification solution A, take it out after 5 hours and wash it with pure water;

[0044] S4. After contacting the above-mentioned S3 diaphragm with the modified solution B for 15 hours, remove the excess solution and wash it with pure water for later use.

[0045] The salt rejection rate and water flux of the polyamide reverse osmosis composite membrane were tested under the conditions of NaCl concentration of 2000mg / l, pressure of 1...

Embodiment 3

[0049] S1. Dissolve 1.5g 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 15g N-methylpiperazine and 10g sodium phosphate in 1000ml pure water, and use 0.1 mol / l HCl solution or NaOH solution to adjust the pH to 7.0, as modified solution A;

[0050] S2. Take 100g of 1,4-butane sultone and dissolve it in 1000ml of ethanol / water solution (1:1 by volume), stir it evenly and use it as modified solution B;

[0051] S3. Rinse the commercialized polyamide reverse osmosis composite membrane with pure water, soak it in the modification solution A, take it out after 5 hours and wash it with pure water;

[0052] S4. After contacting the above-mentioned S3 diaphragm with the modified solution B for 15 hours, remove the excess solution and wash it with pure water for later use.

[0053] The salt rejection rate and water flux of the polyamide reverse osmosis composite membrane were tested under the conditions of NaCl concentration of 2000mg / l, pressure of 1.55MPa, temperature o...

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Abstract

The invention relates to a method for synchronously improving the flux and the anti-pollution performance of a polyamide reverse osmosis composite membrane. The method comprises the steps that first,1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride is used for activating carboxyl group on the surface of the polyamide reverse osmosis composite membrane to react with primary amine, secondary amine or hydroxyl group to introduce a tertiary amine group; then the tertiary amine group reacts with sultone on the surface of the membrane to achieve the purpose of introducing amphoteric molecules in the form of chemical bonds; on the other hand, due to the protection of a water molecular layer, the condition that membrane fouling is caused due to the fact pollutants in feed liquid are deposited on the membrane surface is avoided; and in addition, the method is post-processing and does not affect the overall consistency of a polyamide separation layer so as to simultaneously improve the permeability and the anti-pollution performance of a commercial polyamide reverse osmosis composite membrane without sacrificing the retention performance of the polyamide reverse osmosis compositemembrane, and good application prospects are achieved.

Description

technical field [0001] The invention relates to a method for synchronously improving the flux and anti-pollution performance of polyamide reverse osmosis composite membranes, belonging to the technical field of separation membrane preparation, which can simultaneously improve the permeation flux and anti-pollution performance of commercialized polyamide reverse osmosis composite membranes, and reduce operating costs. The maintenance cost provides conditions for further expanding the application field of reverse osmosis membrane separation technology. Background technique [0002] As the core of reverse osmosis technology, the development of reverse osmosis membrane materials has gone through three stages: homogeneous symmetric membrane, asymmetric membrane and composite membrane. Acyl chloride and m-phenylenediamine are prepared by interfacial polymerization on the surface of polysulfone microporous membrane, which has the advantages of large flux, high salt rejection rate, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D69/02B01D71/56
CPCB01D67/0006B01D69/12B01D69/125B01D71/56B01D69/02B01D2323/02B01D2325/36
Inventor 俞三传吕振华刘梅红
Owner ZHEJIANG SCI-TECH UNIV
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