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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, simple operation, and easy control of reaction conditions

Active Publication Date: 2016-06-01
OCEAN UNIV OF CHINA
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  • 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

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  • 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] Add 700ml of 2.5mol / L KOH solution to 100g of polyvinylidene fluoride (PVDF) powder, stir and react at 60°C for 30 minutes, then suction filter, wash with pure water and vacuum dry in sequence to obtain polyvinylidene fluoride pretreated with alkali. Vinyl 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 ...

Embodiment 2

[0044] Add 700ml of 2.5mol / l KOH solution to 100g of PVDF powder, stir and react at 60°C for 30 minutes, then suction filter, wash with pure water and vacuum dry in sequence 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, a liquid film with a thickness of 100 μm is scraped off, and the solvent is fully evaporated at 50° C. and then immersed in pure wate...

Embodiment 3

[0046] Add N-methylpyrrolidone to the PVDF powder to fully dissolve to 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. PVDF-g-PDMAEMA was dissolved in N-methylpyrrolidone to prepare a casting solution with a concentration of 12%. After the casting solution is fully degassed, a liquid film with a thickness of 100 μm is scraped off, and the solvent is fully evaporated at 50° C. and then immersed in pure water to obtain an anion exchange membrane. at 30mA / cm 2 The constant current density electrodialysis concentration of 0.1M HCl is used as the evaluation syste...

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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

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Application Information

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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
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