Method for manufacturing monolithic bipolar membrane

A bipolar membrane, manufacturing method technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. To achieve the effect of easy large-scale industrial production, lower impregnation temperature, and safe operation

Active Publication Date: 2012-03-21
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

Due to the high crystallinity of polyethylene film, compact structure, and less amorphous area, styrene and divinylbenzene are not easy to immerse into the film, and it is necessary to partially destroy the crystalline area of ​​the film at high temperature (70-90°C) to make it Styrene and divinylbenzene enter, but the amount of entry is not much, so the amount of styrene and divinylbenzene in the prepared base film (called impregnation rate) is not high, at most 45%, and the bipolar membrane prepared in this way , its anion and cation exchange capacity is not high, and its resistance is large
(2) In this method, the membrane is immersed at 70-90°C, and the initiator benzoyl peroxide will decompose at 80°C, triggering the copolymerization reaction of styrene and divinylbenzene, so the polymerization reaction is easily caused during the membrane immersion process , or make the solution viscous, the solution can only be used once and then discarded
Dichloroethane is toxic and not good for mass production
(4) Due to the use of trimethylamine acetone solution for quaternization, there is no tertiary amine catalytic layer that accelerates the decomposition of water
(5) This method uses 25% trimethylamine acetone solution to carry out quaternization reaction, the price of amination agent is high, acetone is flammable, hidden danger
Due to the above disadvantages, this invention has not been seen to be implemented in industry so far

Method used

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  • Method for manufacturing monolithic bipolar membrane
  • Method for manufacturing monolithic bipolar membrane
  • Method for manufacturing monolithic bipolar membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1, the preparation of raw material film: with 3 kilograms of commercially available polyethylene granules (melt index 0.75-1.2) and 2 kilograms of commercially available ethylene and octene copolymer (brand POE-8003) elastomer containing 20% ​​octene in Mix in a granulator, melt (temperature 190-220° C.) and granulate to obtain a granular blend. Next, heat the granular blend on a casting machine (temperature 190-250° C.) to melt, and cast to obtain a blended gold film of 0.18±0.01 mm, which is a self-made raw material film.

[0031] Cut the self-developed polyethylene and ethylene and octene copolymer elastomer blend film into 800mm×400mm, with a thickness of 0.18mm, and put multiple sheets together with styrene, divinylbenzene (crosslinking agent, the content is benzene 5% of ethylene) and benzoyl peroxide (initiator, content is 0.5%-1% of styrene amount) in the stainless steel tank of the solution that forms, at room temperature (about 25 ℃) leave standstill 3 hours, ...

Embodiment 2

[0036] Adopt polyethylene and ethylene and octene copolymer elastomer (containing 20% ​​octene) blended film (elastomer content is 40%), operation procedure is according to embodiment 1. The impregnation time of the basement film was 2 hours, and the impregnation rate of the basement film was 60%. Sulfonation conditions, chloromethylation and amination conditions are all the same as in Example 1. The negative ion exchange capacity of the obtained bipolar membrane was 1 meq / g dry film, the positive ion exchange capacity was 1.2 meq / g dry film, and the transmembrane voltage drop was 1.9V.

Embodiment 3

[0038] Adopt polyethylene and ethylene and octene copolymer elastomer (containing 45% octene) blended film (elastomer content is 45%), the operating steps are as in Example 1. The impregnation temperature of the base film is 30° C., the time is 3 hours, and the impregnation rate of the base film is 70%. Basement film sulfonation temperature is 80°C, time is 5 hours, chloromethylation temperature is 50°C, time is 16 hours, aminated with 30% trimethylamine aqueous solution containing 6% dimethylamine, temperature is 35°C, time is 10 hours, to obtain The bipolar membrane has a positive ion exchange capacity of 1.6 meq / g dry film, a negative ion exchange capacity of 0.7 meq / g dry film, and a transmembrane voltage drop of 1.8V.

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Abstract

The invention relates to a method for manufacturing a monolithic bipolar membrane, which comprises the following steps of: immersing a substrate membrane in a solution containing styrene, divinybenzene and benzoyl peroxide, pressurizing the immersed membrane, wherein the substrate membrane is a thin alloy membrane formed by two-element blending of polyethylene and ethylene-octylene copolymer elastomer or by three-element blending of polyethylene, ethylene-octylene copolymer elastomer and polyisobutylene rubber; and pressurizing the membrane immersed in the solution and polymerizing under the condition of heating to obtain a base membrane; sulfonating one side face of the base membrane by heating in concentrated sulfuric acid; performing chloromethylation reaction of the membrane with one sulfonated side face in chloromethyl ether containing anhydrous stannic chloride so that the other side face of the membrane is chloromethyl; and immersing the membrane in a trimethylamine aqueous solution or a trimethylamine aqueous solution containing dimethylamine to carry out an aimination or quaterisation reaction to obtain the monolithic bipolar membrane. The method has the advantages that the immersing temperature is greatly reduced, the styrene and divinybenzene solution can be repeatedly used, and the electric resistance of the bipolar membrane is low. The bipolar membrane has a catalytic layer for accelerating water decomposition, the method is simple and convenient and is easy for large-scale industrialized production.

Description

technical field [0001] The invention relates to a method for manufacturing bipolar membranes in membrane separation materials in the field of chemical engineering. Background technique [0002] Under the action of a direct current electric field in the bipolar membrane, the water splitting in the middle water layer between the cathode and anode layers produces 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. The method is to use high-density polyethylene film, ultra-high molecular weight polyethylene film as the base film, immersed in a solution composed of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/16C08J7/14C08J7/12C08L23/06C08L23/08C08L23/22B01D69/12B01D67/00B01D71/28B01D71/26
Inventor 葛道才
Owner 福建省延润膜环保科技有限公司
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