Bipolar membrane taking porous anode membrane as base material and preparation method of bipolar membrane

A technology of bipolar membranes and porous base membranes, applied in diaphragms, organic diaphragms, electrolysis processes, etc., can solve problems such as interpenetration, lower production efficiency of bipolar membranes, and increased water dissociation voltage of composite bipolar membranes

Active Publication Date: 2019-01-08
UNIV OF SCI & TECH OF CHINA
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  • Abstract
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  • Application Information

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Problems solved by technology

However, since the porous support layer material used is uncharged material such as polytetrafluoroethylene, and the dense anion and cation exchange membrane layers will increase the mass transfer resistance, the water dissociation voltage of this composite bipolar membrane will increase significantly. At the same time, the method of casting the membrane liquid on the porous support layer will cause mutual penetration between the two membrane layers, thereby reducing the production efficiency of the bipolar membrane

Method used

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  • Bipolar membrane taking porous anode membrane as base material and preparation method of bipolar membrane
  • Bipolar membrane taking porous anode membrane as base material and preparation method of bipolar membrane
  • Bipolar membrane taking porous anode membrane as base material and preparation method of bipolar membrane

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preparation example Construction

[0042] The present invention provides a method for preparing a bipolar membrane based on a porous positive membrane as described in the technical solution, comprising the following steps:

[0043] a) dissolving the cyano polymer in an organic solvent, scraping the obtained film solution, and obtaining a porous base film layer containing a cyano functional group in water by phase separation; oxidizing the cyano group in the porous base film layer to a carboxyl group to obtain Porous cation exchange membrane layer;

[0044] b) Soak the cation exchange membrane layer in the intermediate layer solution containing the metal ion-amine complex, take it out and place it on the substrate, and dry it to obtain the cation exchange membrane layer with the intermediate interface layer;

[0045] c) casting the anion-exchange membrane liquid onto the middle interface layer of the cation-exchange membrane layer with the middle interface layer, and drying to obtain a bipolar membrane with a po...

Embodiment 1

[0060] 1. Preparation method of bipolar membrane

[0061] 1.1 Prepare a polyacrylonitrile film solution with a mass concentration of 17%, pour an appropriate amount of film solution on a smooth and clean glass plate, and use an automatic film scraper to scrape the film. The glass plate is quickly placed in a container of water, causing as little fluctuation as possible in the water surface. As the organic solvent N,N-dimethylformamide gradually dissolves into water, polyacrylonitrile forms a uniform film layer on the glass plate, and the prepared finger-shaped pore-based film layer is placed in pure water, and then the for hydrolysis reactions.

[0062] 1.2 Put the above-mentioned base film layer into 1.5mol / L sodium hydroxide, and react in an oven at 60°C for 2 hours. The porous membrane layer was taken out, washed three times with pure water, then soaked in 1mol / L hydrochloric acid for 12 hours, then taken out, washed three times with pure water. Scanning electron microsc...

Embodiment 2

[0092] 2.1 Prepare a polyacrylonitrile film solution with a mass concentration of 20%, pour an appropriate amount of film solution on a smooth and clean glass plate, and use an automatic film scraper to scrape the film. Put the glass plate into a container filled with water, put the prepared porous base membrane layer into pure water, and then use it for hydrolysis reaction.

[0093] 2.2 Put the above-mentioned base film layer into 2mol / L sodium hydroxide, and react in an oven at 40°C for 2 hours. The porous film layer was taken out, washed three times with pure water, then the film was soaked in 2mol / L hydrochloric acid for 12 hours, then the film layer was taken out, washed three times with pure water.

[0094] 2.3 Prepare a mixed solution of 1,3-propylenediamine and cobalt chloride with a mass ratio of 1:5, dissolve 1g of 1,3-propylenediamine and 5g of cobalt chloride in pure water, and dilute to a 1000mL volumetric flask , the solution was stirred at room temperature for ...

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Abstract

The invention provides a bipolar membrane taking a porous anode membrane as a base material and a preparation method of the bipolar membrane. The bipolar membrane comprises a cation exchange membranelayer, an intermediate interface layer and an anion exchange membrane layer contacted in sequence, wherein the cation exchange membrane layer is of a porous structure; the intermediate interface layercomprises a metal ion-amine complex; and the anion exchange membrane layer is of a dense structure. The intermediate interface layer of the bipolar membrane contains lots of hydrophilic primary amine, secondary amine and tertiary amine groups, and water dissociation can be effectively promoted; the metal ion has an effect of catalyzing the water dissociation, and the water dissociation voltage can be greatly reduced; coordination bonds are formed between the organic amines and metal ions, an effect of immobilizing the metal ions is achieved, leakage of the metal ions is greatly reduced, and excellent water dissociation property of the bipolar membrane is ensured; and in addition, the cation membrane layer is of the porous structure, and the ion conduction rate is increased, so that the water dissociation efficiency of the bipolar membrane is obviously improved. Therefore, the bipolar membrane has excellent water dissociation property.

Description

technical field [0001] The invention belongs to the technical field of bipolar membranes, and in particular relates to a bipolar membrane with a porous positive membrane as a base material and a preparation method thereof. Background technique [0002] Bipolar membrane is a new type of ion exchange composite membrane, which usually consists of anion exchange layer, cation exchange layer and intermediate catalytic layer. The characteristic of the bipolar membrane is that water dissociation occurs under the action of a reverse electric field, and the water molecules are dissociated into hydrogen ions and hydroxide ions. Under the action of an external electric field, the hydrogen ions and hydroxide ions are transferred to the bipolar film Pole film Two pole chambers, so that the salt solution in the pole chamber is converted into the corresponding acid or alkali. The water dissociation technology of bipolar membranes has been gradually improved and has become a commonly used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B13/02C25B13/08
CPCC25B13/02C25B13/08
Inventor 徐铜文吴亮葛紫娟葛亮
Owner UNIV OF SCI & TECH OF CHINA
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