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: 2011-05-18
BEIJING TINGRUN MEMBRANE TECH DEV
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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, trigg

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
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Example Embodiment

[0029] Example 1

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

[0031] The self-developed polyethylene and ethylene and octene copolymer elastomer blend films were cut into 800mm × 400mm, with a thickness of 0.18mm, and multiple sheets were placed together to contain styrene, divinylbenzene (crosslinking agent, the content of which was benzene). 5% of ethylene) and benzoyl peroxide (initiator, the content is 0.5%-1% of styrene) in a stainless steel tank, let stand for 3 hours at room temperature (about 25°C), tak...

Example Embodiment

[0035] Example 2

[0036] Polyethylene and ethylene and octene copolymer elastomer (containing 20% ​​octene) blended film (elastomer content of 40%) was used, and the operation steps were as in Example 1. The base film impregnation time was 2 hours, and the base film impregnation rate was 60%. Sulfonation conditions, chloromethylation, and amination conditions are the same as in Example 1. The resulting bipolar membrane had an anionic ion exchange capacity of 1 meq / g dry membrane, a cationic ion exchange capacity of 1.2 meq / g dry membrane, and a transmembrane voltage drop of 1.9 V.

Example Embodiment

[0037] Example 3

[0038] Polyethylene and ethylene and octene copolymer elastomer (containing 45% of octene) are used to blend film (the content of elastomer is 45%), and the operation steps are as in Example 1. The base film impregnation temperature was 30° C., the time was 3 hours, and the base film impregnation rate was 70%. The base film was sulfonated at 80°C for 5 hours, chloromethylated at 50°C for 16 hours, aminated with a 30% trimethylamine aqueous solution containing 6% dimethylamine, at 35°C for 10 hours to obtain A bipolar membrane with a cation exchange capacity of 1.6 meq / g dry membrane, anion exchange capacity of 0.7 meq / g dry membrane, and a voltage drop across the membrane 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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IPC IPC(8): C08J7/16C08J7/14C08J7/12C08L23/06C08L23/08C08L23/22B01D69/12B01D67/00B01D71/28B01D71/26
Inventor 葛道才
Owner BEIJING TINGRUN MEMBRANE TECH DEV
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