Unlock instant, AI-driven research and patent intelligence for your innovation.

Anion exchange membrane with acid blocking function and preparation method thereof

An anion-exchange membrane and ion-exchange membrane technology, applied in the field of ion-exchange membranes, can solve problems such as the attenuation of membrane acid resistance, and achieve the effects of long membrane life, easy operation, and easy control of reaction conditions.

Active Publication Date: 2018-10-23
OCEAN UNIV OF CHINA
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems that need to be solved urgently in the above-mentioned acid-blocking membranes. For example, the acid-blocking ability of the membrane is often greatly attenuated with the increase of the acid concentration, and the acid-blocking performance of the membrane is often obtained at the expense of the membrane conductance, etc.

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
  • Anion exchange membrane with acid blocking function and preparation method thereof
  • Anion exchange membrane with acid blocking function and preparation method thereof
  • Anion exchange membrane with acid blocking function and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 700 ml of 2.5 mol / L KOH solution was added to 100 g of polyvinylidene fluoride (PVDF) powder, stirred and reacted at 60 °C for 30 minutes, followed by suction filtration, pure water washing and vacuum drying to obtain alkali-pretreated Polyvinylidene fluoride. Add an appropriate amount of the above alkali-treated polyvinylidene fluoride, dimethylaminoethyl methacrylate (DMAEMA) and azobisisobutyronitrile (AIBN) to dimethylacetamide, and the molar ratio of the three is 25: 25:1. Under nitrogen protection, react at 60°C for 24 hours. The product PVDF-g-PDMAEMA was obtained by ethanol precipitation, and the precipitate was washed with ethanol and pure water several times after suction filtration, and then dried in vacuum for use. Infrared spectra of polyvinylidene fluoride and products ( figure 1 ) comparison, it can be seen that at wavenumber 2760cm -1 -2820cm -1 The new peaks that appear correspond to the -N(CH 3 ) 2 The stretching vibration of the methyl group of...

Embodiment 2

[0044] 700 ml of 2.5 mol / l KOH solution was added to 100 g of PVDF powder, stirred and reacted at 60 °C for 30 minutes, followed by suction filtration, pure water washing and vacuum drying to obtain alkali pretreated polyvinylidene fluoride. Add an appropriate amount of alkali-treated polyvinylidene fluoride, vinylpyridine (VP) and azobisisobutyronitrile (AIBN) into dimethylacetamide, and the molar ratio of the three is 25:25:1. Under nitrogen protection, react at 60°C for 24 hours. Precipitate the product PVDF-g-PVP with ethanol, wash the precipitate with ethanol and pure water several times after suction filtration, and dry it in vacuum for later use. The infrared spectrum of the product is as Figure 5 shown. Dissolve PVDF-g-PVP in dimethylformamide to prepare a casting solution with a concentration of 15%. After the casting solution is fully degassed, scrape a liquid film with a thickness of 100 μm, fully evaporate the solvent at 50 °C, and then immerse in pure water to...

Embodiment 3

[0046] After adding N-methylpyrrolidone into the PVDF powder and fully dissolving it, obtain a 50g / L solution, and then add O 3 O at a concentration of 0.1 g / L 2 / O 3 Mixed gas was bubbled into it at a flow rate of 500 L / h for one hour. Subsequently, the N 2 20 minutes to remove the residual ozone in the system, then add an appropriate amount of DMAEMA (the molar ratio of DMAEMA to PVDF is 2:1) to the system, and stir and react at 60°C for 10 hours, then suction filter and wash with pure water and vacuum drying to obtain the product PVDF-g-PDMAEMA. Dissolve PVDF-g-PDMAEMA with N-methylpyrrolidone to prepare a casting solution with a concentration of 12%. After the casting solution is fully degassed, scrape a liquid film with a thickness of 100 μm, fully evaporate the solvent at 50 °C, and then immerse in pure water to obtain an anion exchange membrane. at 30mA / cm 2 The constant current density electrodialysis concentrated 0.1M HCl was used as the evaluation system for t...

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
current efficiencyaaaaaaaaaa
current efficiencyaaaaaaaaaa
current efficiencyaaaaaaaaaa
Login to View More

Abstract

The invention discloses an anion exchange membrane with an acid blocking function and a preparation method thereof. The anion exchange membrane is prepared by scraping a grafted copolymer formed by a polyvinylidene fluoride main chain and a lateral chain containing a weak alkali group, wherein the main chain of the grafted copolymer has a hydrophobic property and the lateral chain has a hydrophilic property; and the anion exchange membrane is of a microcosmic phase separation structure. The preparation method of the anion exchange membrane comprises the following steps: carrying out grafting copolymerization on a functional monomer with the weak alkali group and containing unsaturated double bonds and polyvinylidene fluoride; then preparing a membrane casting solution by the copolymer above; and carrying out liquid membrane scraping and solvent volatilization to obtain the anion exchange membrane with the acid blocking function. An experiment shows that the membrane has an excellent inhibition function on proton transfer, and has a wide application prospect in the fields of electrodialysis-method acid concentration and bipolar membrane electrodialysis-method acid preparation and the like.

Description

technical field [0001] The invention belongs to the technical field of ion-exchange membranes, and in particular relates to an anion-exchange membrane with an acid-blocking function and a preparation method thereof. Background technique [0002] As we all know, protons will pass through the anion exchange membrane during the electromembrane process, which will significantly reduce the current efficiency of acid recovery and concentration by electrodialysis and acid preparation by bipolar membrane electrodialysis, and even make related application processes impossible. Relevant basic research has shown that the unique transport mechanism (such as Grotthuss mechanism and Vehicle mechanism) of protons in solution and in ion exchange membranes makes their mobility much higher than that of other cations. Therefore, the preparation of anion-exchange membranes with high acid barrier function is a challenge with important application value, and people have tried it from different an...

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): B01D71/78B01D69/02B01D67/00
CPCB01D67/0011B01D69/02B01D71/78B01D2323/36B01D2323/38B01D2325/26B01D2325/42
Inventor 汪锰汪贝贝贾玉香
Owner OCEAN UNIV OF CHINA