A method of manufacturing a monolithic bipolar membrane

The technology of a bipolar membrane and a manufacturing method, which is applied in the field of preparation of membrane separation materials, can solve the problems that the base membrane cannot be obtained by impregnation, and the bipolar membrane cannot be further prepared, and achieves easy large-scale industrial production, mechanical The effect of high strength and low resistance

Active Publication Date: 2018-09-28
福建省延润膜环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to polyethylene, modified polyethylene, polypropylene and other films that can be impregnated, polytetrafluoroethylene films, tetrafluoroethylene-hexafluoropropylene copolymer films, etc. cannot be impregnated to form a base film, nor can they be made bipolar membrane

Method used

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  • A method of manufacturing a monolithic bipolar membrane
  • A method of manufacturing a monolithic bipolar membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Cut a polyethylene film with a thickness of 0.15mm into a size of 400mm*800mm, alternately stack it with glass cloth of the same size to form a film stack, and immerse the film stack in a container filled with styrene-divinylbenzene (the content of divinylbenzene is 5% of the mass fraction of styrene) in the rectangular aluminum container of the monomer solution, through high-purity nitrogen deoxygenation, and seal. Then place the container in In the gamma source room, irradiate at room temperature with a total dose of 5 kilograys (K Gray). The membrane stack was taken out and separated to obtain a grafted membrane (abbreviated as basement membrane), with a grafting degree of 55%.

[0046] Then put one side of the base film close to the ceramic sheet and fix it tightly, put them together in concentrated sulfuric acid for single-sided sulfonation, sulfonation conditions: sulfonate at 70°C for 6 hours, cool, take out, and separate , to obtain a positive film with a pos...

Embodiment 2

[0049] A blended film (with an elastomer content of 45 wt%) of polyethylene with a thickness of 0.15mm and an ethylene-octene copolymer elastomer (containing 45 wt% of octene) was used as the raw material film (ie, the base film). Cut the 0.15mm thick polyethylene and ethylene-octene copolymer elastomer (containing octene 45wt%) blended film (elastomer content is 45wt%) into a size specification of 400mm*800mm, and glass cloth of the same size specification Alternately stacked into a membrane stack, and the membrane stack is immersed in a rectangular aluminum container filled with styrene-divinylbenzene (divinylbenzene content is 8% of the mass fraction of styrene) monomer solution, through high-purity nitrogen deoxygenation, and sealed. Then place the container in In the gamma source room, irradiate at room temperature with a total dose of 10 kilograys (K Gray). The membrane stack was taken out and separated to obtain a grafted membrane (abbreviated as basement membrane), ...

Embodiment 3

[0053] Adopt polypropylene film to make basement membrane, operating procedure is according to embodiment 1. Except not adding divinylbenzene in the monomer solution, others are the same as embodiment 1. The grafting degree of the base film is 65%, the positive layer capacity of the bipolar membrane is 1.76 meq / g dry film, the negative layer capacity is 0.72 meq / g dry film, and the water content is 36%. The transmembrane voltage is 2.0V, and the burst strength is 0.24MPa.

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Abstract

The invention relates to a production method of a single-sheet bipolar membrane, and belongs to the technical field of preparation of a membrane separation material in the field of chemical engineering. The production method comprises the following steps: a polyolefin membrane or a polyhaloalkene membrane is taken as a substrate membrane; the substrate membrane is immersed into a monomer solution filled with styrene-divinylbenzene, nitrogen is fed, the mixture is sealed and then placed in a radiation source chamber for radiation, and then the mixture is taken out to obtain the base membrane; one side surface of the base membrane is heated for sulfonation in concentrated sulfuric acid or chlorosulfonic acid, and a positive surface membrane of the bipolar membrane is formed; the membrane with one sulfonated side surface has a chloromethylation reaction in chlorosulfonic acid containing tin tetrachloride anhydrous to obtain the membrane with a chloromethyl group on the other side surface, the membrane is then immersed in a trimethylamine aqueous solution or a dimethylamine-containing trimethylamine aqueous solution for an amination or quaterization reaction to form a negative surface membrane of the bipolar membrane, and the single-sheet bipolar membrane is formed. The prepared bipolar membrane has low resistance and low transmembrane voltage, and the production method is simple and convenient and facilitates large-scale industrial production.

Description

technical field [0001] The invention relates to a method for manufacturing a monolithic bipolar membrane, which belongs to the technical field of preparation of membrane separation materials in the field of chemical engineering. Background technique [0002] Under the action of a DC electric field, the bipolar membrane splits water in the water layer between the cathode and anode layers to generate hydrogen ions and hydroxide ions, which pass through the anode layer and the cathode layer respectively to provide hydrogen ions and hydroxide ions. Therefore, an electrodialysis device assembled with a bipolar membrane can be used to produce acids and bases from salts. [0003] A method for manufacturing a monolithic bipolar membrane is known, and US Pat. No. 4,024,043 discloses a method for manufacturing a bipolar membrane using a polyethylene film as a substrate. In this method, high-density polyethylene film and ultra-high molecular weight polyethylene film are used as the ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/18C08J7/14C08L23/06C08L23/08C08L23/12C08L27/16C08L27/18
Inventor 葛道才郭雄军刘芬
Owner 福建省延润膜环保科技有限公司
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