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

Polyamide nanofiltration membrane as well as preparation method and application thereof

A technology of polyamide-based membranes and activated polyamide-based membranes, applied in the field of separation membranes, can solve problems such as the decline in the rejection rate of small organic molecules, irreversible pollution, etc., achieve excellent chemical cleaning stability, excellent alkali swelling resistance, and improve separation selective effect

Active Publication Date: 2020-12-22
INST OF PROCESS ENG CHINESE ACAD OF SCI
View PDF7 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two nanofiltration membrane modification methods all improve the separation efficiency of the nanofiltration membrane by changing the surface charge or hydrophilicity of the membrane, but the modified polyamide nanofiltration membrane is still stable in an alkaline environment with a pH greater than 11. Swelling will occur, and the retention rate of organic small molecules will be significantly reduced after alkali cleaning, and small molecular pollutants will easily enter the nanofiltration membrane pores to form irreversible pollution

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
  • Polyamide nanofiltration membrane as well as preparation method and application thereof
  • Polyamide nanofiltration membrane as well as preparation method and application thereof
  • Polyamide nanofiltration membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A kind of preparation method of polyamide nanofiltration membrane, concrete steps are as follows:

[0061] (1) XN45 (Trisep TM ) The polyamide-based membrane is placed in an aqueous sodium hydroxide solution with a pH value of 11 and treated at 30° C. for 1 hour, and washed to obtain a pretreated polyamide-based membrane;

[0062] (2) Place the pretreated polyamide-based membrane obtained in step (1) in the MES buffer (0.1M, pH=5) of EDC and NHS for 1h at 37°C; wherein, the mass concentration of EDC in the MES buffer solution is 0.5g / L, the mass concentration of NHS is 0.8g / L, and the activated polyamide-based membrane is obtained;

[0063] (3) Treat the activated polyamide-based membrane obtained in step (2) in a phosphoric acid (PBS) buffer (0.1M, pH=6) with a molecular weight of 1800Da polyethyleneimine for 1 hour at 37°C, wherein the polyamide in the PBS buffer The mass concentration of ethyleneimine is 0.4g / L, and the polyamide nanofiltration membrane is obtained...

Embodiment 2

[0065] A kind of preparation method of polyamide nanofiltration membrane, concrete steps are as follows:

[0066] (1) Place the NF270 polyamide-based membrane with a molecular weight cut-off of 200Da in an aqueous sodium hydroxide solution with a pH value of 11.5 and treat it at 25° C. for 1 hour, and then wash to obtain a pretreated polyamide-based membrane;

[0067] (2) Place the pretreated polyamide-based membrane obtained in step (1) in the MES buffer (0.1M, pH=5) of EDC and NHS for 1h at 37°C; wherein, the mass concentration of EDC in the MES buffer solution is 0.4g / L, the mass concentration of NHS is 0.6g / L, and the activated polyamide-based membrane is obtained;

[0068] (3) Treat the activated polyamide-based membrane obtained in step (2) in a phosphoric acid (PBS) buffer (0.1M, pH=6) with a molecular weight of 600Da polyethyleneimine for 2 hours at 37°C, wherein the polyamide in the PBS buffer The mass concentration of ethyleneimine is 0.3g / L, and the polyamide nanof...

Embodiment 3

[0070] A kind of preparation method of polyamide nanofiltration membrane, concrete steps are as follows:

[0071] (1) The XN45 polyamide-based membrane with a molecular weight cut-off of 300Da was placed in an aqueous sodium hydroxide solution with a pH value of 10.5 and treated at 35° C. for 1 hour, and washed to obtain a pretreated polyamide-based membrane;

[0072] (2) Place the pretreated polyamide-based membrane obtained in step (1) in the MES buffer (0.1M, pH=5) of EDC and NHS for 2h at 37°C; wherein, the mass concentration of EDC in the MES buffer solution is 0.5g / L, the mass concentration of NHS is 0.8g / L, and the activated polyamide-based membrane is obtained;

[0073] (3) Treat the activated polyamide-based membrane obtained in step (2) in chitosan phosphoric acid (PBS) buffer (0.1M, pH=6) at 37°C for 2h, wherein the mass of chitosan in PBS buffer The concentration is 0.3g / L, and the polyamide nanofiltration membrane is obtained.

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
Molecular weightaaaaaaaaaa
Login to View More

Abstract

The invention provides a polyamide nanofiltration membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) activating a polyamide base membrane by using an activating agent to obtain an activated polyamide base membrane; and (2) grafting the activated polyamide base membrane obtained in the step (1) with an amino compound to obtainthe polyamide nanofiltration membrane. The preparation method has the advantages of simple process, convenience in operation and the like; on one hand, the prepared polyamide nanofiltration membranehas the advantages of small surface macropore number, small average pore size and high rejection rate for organic micromolecules; on the other hand, the electronegativity is low, and the rejection rate of monovalent inorganic salt is low; and the polyamide nanofiltration membrane also has excellent alkali-resistant swelling performance and chemical stability, and has a wide industrial applicationprospect.

Description

technical field [0001] The invention belongs to the technical field of separation membranes, and in particular relates to a polyamide nanofiltration membrane and its preparation method and application. Background technique [0002] Due to its simple preparation process, small pore size, high water permeation flux, and strong pollution resistance, polyamide nanofiltration membranes have become the most successful nanofiltration membranes in industrial applications, and have been widely used in drinking water treatment and waste water recycling. , decolorization of biological products, small molecule desalination and other fields. Using m-phenylenediamine or piperazine and trimesoyl chloride monomer to rapidly polymerize at the oil-water two-phase interface, an ultra-thin polyamide separation layer of less than one micron is formed on the polysulfone ultrafiltration membrane substrate to form polyamide nano However, because the residual acid chloride groups on the surface of ...

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): B01D71/68B01D71/56B01D71/26B01D69/12B01D67/00B01D61/02
CPCB01D71/56B01D71/68B01D71/26B01D69/12B01D67/0006B01D61/027
Inventor 罗建泉万印华陈向荣冯世超王敬宇
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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