Bipolar film and preparation method thereof

A bipolar membrane, anion technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of high voltage drop on both sides of the membrane, narrow distribution, limited number of catalytically active points, etc. Simple preparation process

Inactive Publication Date: 2005-12-07
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These ion exchange resins require small particle size (less than 1 micron), narrow distribution, uniform, random, and single-bead distribution in the middle interface layer of the bipolar membrane, so the preparation of this bipolar membrane is very difficult and loaded down with trivial details, and the middle interface The number of catalytically active sites of the layer is limited by the chargeable groups in the resin, which results in a high voltage drop across the bipolar membrane
In Chinese patent 99125066.4, a bipolar membrane with a cross-linked network structure containing quaternary ammonium groups and tertiary amine groups is disclosed in which the intermediate interface layer is dispersed with cation exchange resins. The preparation method of this bipolar membrane can easily realize the intermediate interface layer. Ultra-thin, but there are also the disadvantages of less number of catalytic active sites and higher voltage drop on both sides of the membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Dissolve the second-generation dendritic polyamidoamine (PAMAM, produced by Dendritech, USA) with ethylenediamine as the core in distilled water at a concentration of 0.01 mg / mL; Company, model 3362BW, thickness 0.42mm, water content 35%, ion exchange capacity (dry) 1.8mmol / g, surface resistance 12Ω.cm 2 , permeation selectivity 89%) soaked in this aqueous solution, take it out after being fully absorbed (24 hours), and dry naturally in the shade at room temperature; , SPPO) in dimethylformamide solution (concentration of 1g / 4ml) as the positive membrane layer, placed in an oven at 60°C for 6 hours, and then taken out to obtain a bipolar membrane.

[0018] The membrane is at 0.5mol / L Na 2 SO 4In aqueous solution, the current density is 1000A / m 2 The voltage drop on both sides of the lower membrane is less than 2.6V, and the performance of the membrane is very stable and the service life is long.

[0019] The bipolar membrane prepared by the same method on the anion ...

Embodiment 2

[0021] The preparation process of the bipolar membrane is similar to that of Example 1, except that the heterogeneous anion-exchange membrane is replaced by the homogeneous anion-exchange membrane (thickness 0.2mm, water content 40%, ion-exchange capacity (dry) 1.8mmol / g, surface resistance 4Ω.cm 2 , permeation selectivity 92%).

[0022] The membrane is at 0.5mol / L Na 2 SO 4 In aqueous solution, the current density is 1000A / m 2 The voltage drop on both sides of the lower membrane is less than 2.0V, and the performance of the membrane is very stable and the service life is long.

[0023] The bipolar membrane prepared by the same method on the anion exchange membrane without adsorbed catalytic substance was tested, and the result was that the voltage drop on both sides was 3.2V.

Embodiment 3

[0025] The preparation process of the bipolar membrane is similar to that of Example 1, except that sulfonated polyphenylene ether as the material of the cathodic membrane layer is replaced by sulfonated polyetheretherketone (Sulphonated Poly(ether ether ketone), S-PEEK).

[0026] The membrane is at 0.5mol / L Na 2 SO 4 In aqueous solution, the current density is 1000A / m 2 The voltage drop on both sides of the lower membrane is less than 2.5V, and the performance of the membrane is very stable and the service life is long.

[0027] The bipolar membrane prepared by the same method on the anion exchange membrane without adsorbed catalytic substance was tested, and the result was that the voltage drop on both sides was 3.6V.

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Abstract

The invention relates to a two-pore film and it's preparing technique. The said two-pore film comprises anion exchange layer, cation exchange layer and inter boundary layer, wherein inter boundary layer catalyst is formed by branch polymer of organic manipulation which has molecule structure's repetitive unit contains nitrogen atom and outmost amino, or end amino modifying substance of the polymers. Its preparing method is that first preparing anion exchange layer, and preparing anther anion exchange layer solution with opposite electricity, then preparing catalyst weak solution of inter boundary layer and fixes its catalyst on anion exchange layer by absorbing and blanketing modes, or mixes the catalyst with anion exchange layer solution and then preparing it by slobbering mode.

Description

Technical field: [0001] The invention relates to a bipolar membrane preparation technology in membrane separation materials in the field of chemical engineering, in particular to an electrodialysis water dissociation process. Background technique: [0002] The function of the bipolar membrane is already known. Driven by a reverse bias electric field, it can dissociate water into hydrogen ions and hydroxide ions, and this water dissociation has the advantages of simplicity, high efficiency, and energy saving; Electrodialysis technology based on bipolar membrane has practical or potential wide application in pollution control, resource recovery and chemical production process (Handbook on Bipolar Membrane Technology (Handbook on Bipolar Membrane Technology, ISBN9036515203) edited by A.J.B. Kemperman, No. 17 -46 pages). Bipolar membranes prepared by various methods have been reported in the literature. For example, US Patents 4,024,043 and 4,057,481 report the method of prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12
Inventor 傅荣强徐铜文杨伟华
Owner UNIV OF SCI & TECH OF CHINA
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