Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Simultaneously improve the flux and anti-pollution performance of polyamide reverse osmosis composite membrane

A technology of reverse osmosis composite membrane and polyamide, which is applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problem of rough surface of polyamide reverse osmosis composite membrane, large mass transfer resistance of water molecules, high membrane material Improve the permeability and anti-pollution performance, increase the chemical potential, and avoid membrane fouling

Active Publication Date: 2022-06-21
ZHEJIANG SCI-TECH UNIV
View PDF11 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Simultaneously improve the flux and anti-pollution performance of polyamide reverse osmosis composite membrane
  • Simultaneously improve the flux and anti-pollution performance of polyamide reverse osmosis composite membrane
  • Simultaneously improve the 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 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 15g triethanolamine and 10g sodium phosphate in 1000ml pure water, and use 0.1mol / l Adjust pH to 7.0 with HCl solution or NaOH solution as modified solution A;

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

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

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

[0037] The salt rejection and water flux of the polyamide reverse osmosis composite membrane were tested under the conditions of NaCl concentration of 2000 mg / l, pressure of 1.55 MPa, temperature of 25 °C, and pH ...

Embodiment 2

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

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

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

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

[0045] The salt rejection and water flux of the polyamide reverse osmosis composite membrane were tested under the conditions of NaCl concentration of 2000 mg / l, pressure of 1.55 MPa, tempe...

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 pH to 7.0 as modified solution A;

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

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

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

[0053] The salt rejection and water flux of the polyamide reverse osmosis composite membrane were tested under the conditions of NaCl concentration of 2000 mg / l, pressure of 1.55 MPa, temperature of 25 °C, and...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
surface roughnessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for synchronously improving the flux and anti-pollution performance of polyamide reverse osmosis composite membranes. The invention first utilizes 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride to activate The carboxyl groups on the surface of the polyamide reverse osmosis composite membrane react with primary amines, secondary amines or hydroxyl groups to introduce tertiary amine groups; then use the tertiary amine groups to react with sultone to realize the introduction of chemical bonds on the surface of the membrane The purpose of amphiphilic molecules; on the other hand, due to the protection of the water molecule layer, the pollutants in the feed liquid will not be deposited on the membrane surface to cause membrane pollution; in addition, this method is post-treatment and does not affect the separation layer of polyamide The overall consistency, so that on the basis of not sacrificing the interception performance of the polyamide reverse osmosis composite membrane, the permeability and anti-pollution performance of the commercialized polyamide reverse osmosis composite membrane can be simultaneously improved, which has a good application prospect.

Description

technical field [0001] The invention relates to a method for simultaneously improving the flux and anti-pollution performance of a polyamide reverse osmosis composite membrane, belonging to the technical field of separation membrane preparation. 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, and good chemical stability. [0003] However, this type of polyamide reverse osmosis composite membrane is prone to membrane fouling during actual operation, which not only reduc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com