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Preparation method of bipolar membrane

A technology of bipolar membranes and membrane liquids, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of mechanical and electrochemical properties that are difficult to meet practical requirements, low ion transmission efficiency, and ion permeability To achieve the effect of small membrane impedance, low working voltage and high working current density

Active Publication Date: 2015-10-28
CHONGQING TAIKE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the most widely studied polymer electrolyte substrate materials are mainly PMMA, PAN, PVdF and PEO, but the mechanical and electrochemical properties are difficult to meet the practical requirements, the membrane resistance is large, the water dissociation efficiency is low, and the ion permeability is poor.
[0005] Disadvantages of the existing technology: high bipolar membrane impedance, low ion transmission efficiency, and low water dissociation efficiency

Method used

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Embodiment

[0024] 1. Preparation of bipolar membrane:

[0025] (1) Preparation of PAMPSLi membrane solution: PVA-SA sol was prepared by blending 3% sodium alginate solution with 6% polyvinyl alcohol, and 2% and 4% PAMPSLi was added in the PVA-SA sol, stirred evenly, and degassed under reduced pressure to obtain a viscous PAMPSLi film liquid, wherein the ratio of the amount of the sodium alginate, polyvinyl alcohol and PAMPSLi added was 1:1 :1;

[0026] (2) Preparation of PAMPSLi-SA membrane: cast the PAMPSLi membrane solution on a flat petri dish, air-dry at room temperature to form a film, and then place the air-dried film in an 8.0% ferric chloride solution Soak in medium for cross-linking for 30min, rinse with distilled water, and air-dry to obtain 2%PAMPSLi-SA film and 4%PAMPSLi-SA film;

[0027] (3) Preparation of PAMPSLi-SA / mCS bipolar membrane: Chitosan was dissolved in 2% acetic acid aqueous solution to prepare chitosan acetic acid solution with 3% mass fraction, and then added...

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Abstract

The invention discloses a preparation method of a bipolar membrane. The preparation method of the bipolar membrane is characterized by comprising the following steps of: (1), preparing a PAMPSLi membrane solution; (2), preparing a PAMPSLi-SA membrane; and (3), preparing a PAMPSLi-SA / mCS bipolar membrane. The preparation method of the bipolar membrane disclosed by the invention is simple and convenient to operate. The bipolar membrane which is obtained by the preparation method disclosed by the invention has the characteristics of being small in membrane impedance, low in working voltage, large in working current density, high in hydrolytic dissociation efficiency, high in ion permeability and the like.

Description

technical field [0001] The invention belongs to the field of solid electrolyte materials, and in particular relates to a preparation method of a bipolar membrane. Background technique [0002] A bipolar membrane (BPM) is usually composed of an anion exchange layer and a cation exchange layer, and is a real reactive membrane. Under the action of a direct current electric field, the bipolar membrane can dissociate the water in its middle layer, and obtain hydrogen ions and hydroxide ions on both sides of the positive membrane and the negative membrane respectively. In recent years, BPM technology and its application have achieved rapid development, and have been widely used in the preparation and recovery of organic acids and alkalis, as well as in environmental governance. How to promote the water dissociation in the middle interface layer of the bipolar membrane and improve the efficiency of water dissociation, thereby reducing the resistance voltage drop and cell voltage o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/22C08L5/04C08L29/04C08L33/24C08J3/24B01D67/00B01D71/08B01D71/38B01D71/40
Inventor 罗承毅李亮印显东
Owner CHONGQING TAIKE ENVIRONMENTAL PROTECTION TECH CO LTD
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