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

Positively charged composite nano filtration membrane and preparation method

A composite nanofiltration membrane and positively charged technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of low water flux, complex preparation methods, and positively charged nanofiltration membrane And other issues

Active Publication Date: 2019-05-24
OCHEMATE MATERIAL TECH CO LTD
View PDF6 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent CN105013333A discloses a positive charge composite nanofiltration membrane and its preparation method. After compounding a layer of base film on polypropylene or polyacrylonitrile non-woven fabric, a layer of positive charge separation layer is compounded to prepare a composite nanofiltration membrane. Filter membrane, the nanofiltration membrane under the operating pressure of 0.8MPa, the water flux is 16 ~ 20L / (m 2 h), its water flux is low, and its preparation method is relatively complicated
[0005] The existing positively charged composite nanofiltration membrane has low flux and desalination rate, or the preparation method is relatively complicated, and there is no positively charged nanofiltration membrane prepared by using aramid hollow fiber membrane as the base membrane.

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
  • Positively charged composite nano filtration membrane and preparation method
  • Positively charged composite nano filtration membrane and preparation method
  • Positively charged composite nano filtration membrane and preparation method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0082] (1) Preparation of modified meta-aramid polymer

[0083]Under nitrogen protection, add 80.383mL of DMAc solvent, 0.077mol of m-phenylenediamine, 0.0616mol of APBIA and 0.0154mol of 4-fluoro-1,3-phenylenediamine into a 1L four-necked flask equipped with mechanical stirring and a thermometer. Stir under nitrogen protection until the solute is completely dissolved. Use a freezing bath to adjust the reaction temperature to -15°C, add 0.1155mol of isophthaloyl chloride under stirring, control the reaction temperature of the reaction system below 0°C, and continue to add 0.0262mol of isophthaloyl dimethanol after reacting until the viscosity of the system is stable Acyl chloride, after the reaction until the viscosity of the system is stable, add 0.0123mol of isophthaloyl chloride at the end, the solution starts to thicken, the temperature rises, adjust the stirring speed to control the reaction temperature below 60°C until the reaction is complete, after adding 0.154mol of c...

Embodiment 1

[0110] (1) Preparation of aqueous solution: mix polyethyleneimine, piperazine, SDS and acid absorbent into deionized water to prepare an aqueous solution. In the aqueous solution, the molecular weight of polyethyleneimine is 3000, and the total content of polyethyleneimine and piperazine is 0.5% (w / v), and the ratio of piperazine in this total content is 5%, and the content of surfactant SDS is 0.3% (w / v), acid absorbent (NaCO 3 :NaOH=2:1) ​​content is 0.3% (w / v).

[0111] (2) Preparation of organic solution: adding trimesoyl chloride to isoparaffin Isopar G to prepare an organic solution. The content of trimesoyl chloride in the organic solution is 0.05% (w / v).

[0112] (3) Immerse the modified meta-aramid hollow fiber base membrane in the aqueous solution, take it out after 1 minute, and dry it for 7 minutes after taking it out.

[0113] (4) Immerse the dried basement film in step (3) into an organic solution for interfacial polymerization, take it out after 1 minute, and...

Embodiment 2

[0116] Except that the total content of polyethyleneimine and piperazine was changed to 1.5% (w / v), other experimental conditions were the same as in Example 1.

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
Pure water fluxaaaaaaaaaa
The inside diameter ofaaaaaaaaaa
Outer diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a positively charged composite nano filtration membrane. The nano filtration membrane is characterized in that a modified meta-aramid hollow fiber membrane is taken as a base membrane, an ultra-thin polyamide layer is formed by positively charged polyelectrolyte, polyamine and polyacyl chloride through interfacial polymerization, and a method for preparing the composite nano filtration membrane is prepared. According to the composite nano filtration membrane, pure water throughput under 0.3 MPa is greater than or equal to 24 L (m2 h), the desalting rate of 2g / L divalentcation salt solution is greater than or equal to 90%, the needed cost is lower, and industrialization is easy. The preparation method is simple, operation is easy, reaction conditions are mild, the performance is stable, and the market application prospects are wider.

Description

technical field [0001] The invention relates to the technical field of polymer nanofiltration membranes, in particular to a positively charged composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration (NF) is a membrane separation technology between ultrafiltration (UF) and reverse osmosis (RO). Nanofiltration membranes have good separation performance for high-priced and divalent salts and small molecular organics, and also have the advantages of low operating pressure, large pure water flux, and lower cost. They are widely used in water softening, desalination, and wastewater treatment. application prospects. At present, the preparation methods of nanofiltration membrane mainly include phase inversion method, dip coating method, surface graft polymerization method and interfacial polymerization method. Among them, the interfacial polymerization method is to prepare a nanofiltration functional separation layer on the u...

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
IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D69/12B01D71/60
Inventor 王蒙雷冰王冰菲方佩晖
Owner OCHEMATE MATERIAL TECH CO LTD
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