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

Preparation method of ultrahigh-flux composite nanofiltration membrane

A technology of composite nanofiltration membrane and ultrafiltration membrane, which is applied in the field of membrane separation, can solve problems such as high cost and complicated process, and achieve the effects of uniform and complete reaction, good ductility, and large free volume

Pending Publication Date: 2021-06-25
HEBEI UNIV OF TECH
View PDF8 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical solutions disclosed above all optimize the structure and performance of the separation layer to improve the permeability of the nanofiltration membrane, but the pure water flux of the nanofiltration membrane is all lower than 30L / (m 2 h bar), and the cost is high or the process is complicated

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
  • Preparation method of ultrahigh-flux composite nanofiltration membrane
  • Preparation method of ultrahigh-flux composite nanofiltration membrane
  • Preparation method of ultrahigh-flux composite nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This example aims to illustrate a method for preparing an ultra-high flux composite nanofiltration membrane, and the specific steps are as follows:

[0038] 1. Clean the base membrane: use polyethersulfone (PES) porous ultrafiltration membrane as the support layer, soak it in an aqueous solution containing 1% alcohol for 15 minutes, and clean it with an ultrasonic cleaner for one minute. Repeat the above steps twice to remove the ultrafiltration membrane Chemicals added during preparation and storage were cleaned and stored in a 4°C refrigerator for later use.

[0039] 2. Prepare composite aqueous monomer solution: use pure water as a solvent to configure an aqueous solution containing 0.1w / v% piperazine, 1w / v% hyperbranched polyester molecules, and 0.4w / v% sodium hydroxide, and stir fully After dissolving, store in an incubator at 25°C for future use.

[0040] 3. Prepare the organic phase monomer solution: use n-hexane as the organic solvent to prepare an organic phase ...

experiment example 1

[0043] The ultra-high flux composite nanofiltration membrane prepared in Example 1 is tested for performance:

[0044] Through the cross-flow filtration device, the performance test of pure water flux and salt rejection rate was carried out under the conditions of operating pressure 2bar and temperature 25°C. Using 1000ppm sodium sulfate salt solution as the feed liquid, the feed salt solution and filter salt were measured by conductivity meter Conductivity of the solution and calculate the cutoff. Measurement results: the flux of pure water is 51.62L / (m2·h·bar), and the rejection rate of sodium sulfate is 98.01%.

[0045] The measurement results were compared with the performance of the prepared nanofiltration membranes in the actual cases disclosed in some invention patents (or patent applications), as shown in Table 1.

[0046] Table 1

[0047]

[0048] Can find out by above comparison, under the premise of keeping the high rejection rate to sodium sulfate, the pure wa...

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
Roughnessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of an ultrahigh-flux composite nanofiltration membrane. The preparation method comprises the following steps: blending hyperbranched polyester molecules with a special molecular structure and piperazine molecules to obtain a composite water-phase monomer solution with synergistic reaction capacity, and then carrying out controllable interfacial polymerization reaction on the composite water-phase monomer solution and multi-element acyl chloride on a support layer, and forming an active separation layer with a special structure and function. The introduction of hyperbranched polyester molecules controls the polymerization reaction of piperazine and multi-element acyl chloride by influencing the interface characteristics on one hand, and enables a large number of primary hydroxyl groups contained on the molecular surface to participate in polymerization on the other hand; therefore, a two-branch circular structure and nano-scale pore channels in molecules are anchored in an active separation layer in a covalent bond manner, so that the ultra-thin and smooth ultra-high-flux composite nanofiltration membrane with strong permeation selectivity is generated. The method is simple and convenient to operate, low in cost, wide in raw material source and easy to realize industrial production.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of an ultra-high flux composite nanofiltration membrane. Background technique [0002] In the 1970s, with the advent of interfacial polymerization technology (IP), researchers used amine groups, acyl chlorides and their derivative organics to form a thin film composite nanofiltration membrane with selective permeability on the surface of the porous base membrane through interfacial polymerization. . So far, the interfacial polymerization method is the most widely used and effective nanofiltration membrane preparation method in the market. Nanofiltration membranes are based on the following characteristics: the separation size is between ultrafiltration and reverse osmosis; the separation layer on the surface often contains ionizable functional groups; compared with reverse osmosis membranes, nanofiltration membranes have higher water ...

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): B01D67/00B01D69/12B01D69/02B01D61/02
CPCB01D67/0083B01D69/125B01D69/02B01D61/027B01D2325/04
Inventor 田家宇宋宾张瑞君肖峰高珊珊
Owner HEBEI UNIV OF TECH
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