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Imidazole onium salt anion-exchange membrane and preparation method thereof

An anion-exchange membrane and imidazolium technology, which is applied in the field of imidazolium salt-type anion-exchange membrane and its preparation, can solve the problems of anion-exchange membrane performance degradation, high toxicity of compounds, and environmental pollution, and achieve good chemical stability and grafting The effect of easy process and good thermal stability

Inactive Publication Date: 2011-08-17
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction reagents of the chloromethylation route, such as chloromethyl ether, have a strong carcinogenic effect. As early as 1967, they were listed as banned reagents in factories internationally, and the compounds such as formaldehyde and methyl ether produced by the chloromethylation reaction are toxic. Large, highly volatile, seriously polluting the environment
In addition, the chloromethylation reaction is accompanied by side reactions such as cross-linking of methylene groups, which leads to a decrease in the performance of the anion exchange membrane.

Method used

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  • Imidazole onium salt anion-exchange membrane and preparation method thereof
  • Imidazole onium salt anion-exchange membrane and preparation method thereof
  • Imidazole onium salt anion-exchange membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Soak the high-density polyethylene film in ethanol to remove impurities, then dry it in a vacuum oven to constant weight, and put it into a cobalt source chamber for irradiation, with a total irradiation dose of 20kGy. The irradiated film was placed in a reactor filled with vinylimidazole, so that the film was completely immersed in the monomer, filled with inert argon repeatedly, sealed and placed in a constant temperature water bath at 40°C for 100 hours, and the grafting rate was obtained 40% graft modified film. The grafted film was soaked in ethyl chloride / acetone solution for 12 hours, washed with deionized water, and transformed (OH type: soaked in 1mol / L sodium hydroxide for 24 hours). Wash with deionized water to obtain an OH-type anion exchange membrane. The conductivity of the membrane at room temperature is 0.01S / cm, the ion exchange capacity is 0.85mmol / g, and the water content is 8.13%.

Embodiment 2

[0032] The cross-linked polytetrafluoroethylene film was soaked in acetone to remove impurities, and dried in a vacuum oven to constant weight. It is irradiated with high-energy electron beams, and the total irradiation dose is 150kGy. The irradiated film was placed in a reactor filled with allyl imidazole, so that the film was completely immersed in the monomer, filled with nitrogen repeatedly, sealed and placed in a constant temperature water bath at 80°C for 60 hours to obtain a grafting rate of 50. % of graft modified films. The grafted film was soaked in benzyl chloride / methanol solution for 15 hours, washed with deionized water, and transformed (chlorine type: soaked in dilute hydrochloric acid for one day; sulfuric acid type: soaked in sulfuric acid for one day, hydroxide type: sodium hydroxide or potassium hydroxide Soak in water for a day). Wash with deionized water to obtain an anion exchange membrane. The electrical conductivity of the hydrogen-oxygen membrane at...

Embodiment 3

[0034]The ethylene-tetrafluoroethylene film copolymer film is soaked in acetone to remove impurities, and dried in a vacuum oven to constant weight. It is irradiated with high-energy electron beams, and the total irradiation dose is 120kGy. The irradiated film was placed in a reactor filled with vinylimidazole, so that the film was completely immersed in the monomer, filled with inert argon repeatedly, sealed and placed in a constant temperature water bath at 60°C for 70 hours, and the grafting rate was obtained 60% graft modified film. The grafted film was soaked in methyl iodide / methanol solution for 17 hours, washed with deionized water, and transformed (chlorine type: soaked in dilute hydrochloric acid for one day; sulfuric acid type: soaked in sulfuric acid for one day, hydroxide type: sodium hydroxide or potassium hydroxide Soak in water for a day). Wash with deionized water to obtain an anion exchange membrane. The electrical conductivity of the hydrogen-oxygen membr...

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Abstract

The invention relates to an imidazole onium salt anion-exchange membrane and a preparation method thereof, belonging to an anion-exchange membrane. The invention provides an imidazole onium salt anion-exchange membrane with better thermal stability and chemical stability and a preparation method thereof. The imidazole onium salt anion-exchange membrane is prepared by adopting a polymeric membrane, and has a chemical structure of one class of high polymers with side chains containing imidazole onium salt. The imidazole onium salt anion-exchange membrane has a membrane ionic conductivity of being more than 0.01S / cm, has better thermal stability and chemical stability and can be used at high temperature and in a strong acid, strong alkali and strong oxidizing agent. The preparation method comprises the steps of: soaking a polymeric membrane in acetone, and drying to constant weight after cleaning; radiating a film by high-energy rays; placing the radiated film in a container, injecting monomers in the container to ensure that the film is completely immersed into the monomers, vacuumizing, charging inert gases to the container until no air exists in the container, placing a water bathfor reacting after sealing, removing unreacted monomers, and drying; and soaking the grafted film with a quaternization reagent, and washing with deionized water to obtain the imidazole onium salt anion-exchange membrane.

Description

technical field [0001] The invention relates to an anion exchange membrane, in particular to an imidazolium salt type anion exchange membrane and a preparation method thereof. Background technique [0002] Anion exchange membranes are widely used in water treatment, purification, concentration and separation of substances, chlor-alkali industry, and alkaline anion exchange membrane fuel cells, liquid flow energy storage batteries, new supercapacitors, etc. The anion exchange membrane is composed of a polymer matrix, positively charged active groups and mobile anions on the active groups. At present, the disclosed strong base anion exchange membranes are generally polymers of quaternary ammonium salt type. Since the active group quaternary ammonium salt has poor thermal stability and is easily oxidized and degraded by oxidants, its application range is greatly limited. [0003] Chinese patent 200710072040.7 discloses a modified anion exchange membrane and its preparation met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/78C08J5/22C08L39/04
Inventor 方军郑明森董全峰田昭武卢晓焕施一宁林祖赓
Owner XIAMEN UNIV
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