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A kind of bipolar membrane with porous anodic membrane as base material and preparation method thereof

A technology of bipolar membranes and porous base membranes, applied in the direction of diaphragms, organic diaphragms, electrolytic components, etc., can solve the problem of increased water dissociation voltage of composite bipolar membranes, increased mass transfer resistance, and reduced production efficiency of bipolar membranes. question

Active Publication Date: 2019-11-22
UNIV OF SCI & TECH OF CHINA
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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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  • A kind of bipolar membrane with porous anodic membrane as base material and preparation method thereof
  • A kind of bipolar membrane with porous anodic membrane as base material and preparation method thereof
  • A kind of bipolar membrane with porous anodic membrane as base material and preparation method thereof

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preparation example Construction

[0042] The present invention provides a method for preparing a bipolar membrane using a porous positive membrane as a substrate according to the above technical solution, which includes the following steps:

[0043] a) Dissolve the cyano polymer in an organic solvent, scrape the resulting membrane solution, and obtain a porous base membrane layer containing cyano functional groups in an aqueous phase separation method; oxidize the cyano groups in the porous base membrane layer to carboxyl groups to obtain Porous structure of cation exchange membrane layer;

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

[0045] c) Casting the anion exchange membrane solution onto the intermediate interface layer of the cation exchange membrane layer with the intermediate interface layer, a...

Embodiment 1

[0060] 1. Preparation method of bipolar membrane

[0061] 1.1 Prepare a polyacrylonitrile membrane solution with a mass concentration of 17%, pour an appropriate amount of the membrane solution on a smooth and clean glass plate, and use an automatic film scraper to scrape the film. Put the glass plate into the container with water quickly, so as not to cause the fluctuation of the water surface as much as possible. As the organic solvent N,N-dimethylformamide gradually dissolves into water, polyacrylonitrile forms a uniform film layer on the glass plate, and puts the prepared finger-shaped hole base film layer into pure water. Used in hydrolysis reaction.

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

Embodiment 2

[0092] 2.1 Prepare a polyacrylonitrile membrane solution with a mass concentration of 20%, pour an appropriate amount of the membrane 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 in 2mol / L sodium hydroxide and react in an oven at 40°C for 2 hours. The porous membrane layer was taken out, washed with pure water three times, and then the membrane was soaked in 2 mol / L hydrochloric acid for 12 hours, and then the membrane layer was taken out and washed with pure water three times.

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

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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 using a porous positive membrane as a substrate and a preparation method thereof. Background technique [0002] The bipolar membrane is a new type of ion exchange composite membrane, which is usually composed of an anion exchange layer, a cation exchange layer and an intermediate catalytic layer. The characteristic of the bipolar membrane is that under the action of the reverse electric field, 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 double Two electrode compartments of the polar membrane, so as to convert the salt solution of the electrode compartment into the corresponding acid or alkali. The hydrolysis technology of bipolar membranes is gradually perfected and has become a common unit operation, which...

Claims

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Application Information

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Patent Type & Authority Patents(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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