Process for preparing perfluorinated sulfonic resin solution by using waste perfluorinated ion membrane

A perfluorosulfonic acid resin and perfluorinated ion technology, applied in recycling technology, plastic recycling and other directions, can solve the problems of difficult degradation, environmental governance, waste of resources, etc.

Inactive Publication Date: 2005-11-23
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Whether it is incineration (a large amount of toxic and harmful gases will be produced during the incineration process) or landfill (due to the good chemical stability of the perfluorinated ion membrane, it is very difficult to degrade it) will bring great pressure to environmental governance
In addition, incineration or landfill disposal methods also cause waste of resources

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0010] Said perfluorosulfonic acid resin solution preparation method of the present invention comprises the steps:

[0011] 1) Rinse the waste perfluorinated ion membrane in deionized water to remove the attachment on the surface of the membrane;

[0012] 2) Soak the ionic membrane obtained in step 1) in an aqueous solution of a strong inorganic acid (as long as the membrane is submerged in an aqueous solution of a strong inorganic acid), the recommended inorganic acid is hydrochloric acid, sulfuric acid or nitric acid. When using hydrochloric acid, its concentration is 3-30wt%, and the soaking temperature is 0-90°C; when using sulfuric acid, its concentration is 3-50wt%, and the soaking temperature is 0-120°C; 60wt%, immersion temperature is 0~100℃;

[0013] 3) The ionic membrane obtained in step 2) is cleaned again with deionized water to remove the acid solution in the membrane and on the surface of the membrane; then use ultrasonic cleaning in a water bath;

[0014] 4) S...

Embodiment 1

[0026] Wash the waste F-8020 type ionic membrane with deionized water to clean the membrane surface attachment, then soak it in 8wt% hydrochloric acid solution, the soaking temperature is 80 °C, and the soaking time is 12h; after washing with deionized water, in Ultrasonic cleaning in a deionized water bath for 4 hours; at 25°C, soak in 0.1mol / L EDTA solution for 24 hours, and wash with deionized water several times; then cut the regenerated ionized membrane into pieces about 1×1cm in size. blocks, and dried at 55°C.

[0027] Weigh 20g of the above dried ionic membrane, put it into an autoclave, add 100ml of water and 100ml of isopropanol each, seal it and pass it under nitrogen protection, stir, heat to 210°C, keep it warm for 4h, then cool to room temperature, and filter the resulting mixture That is, 165 ml of perfluorosulfonic acid solution was obtained, and its mass percent concentration was 8.06%.

Embodiment 2

[0029] Weigh 15g of the dried ionic membrane (dry state) in Example 1, put it into an autoclave, add 150ml of water and 150ml of isopropanol, seal it and pass it under nitrogen protection, stir, heat to 210°C, keep it warm for 4h and then cool down After reaching room temperature, the resulting mixed solution was filtered to obtain 260 ml of a perfluorosulfonic acid solution with a concentration of 4.17% by mass.

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Abstract

The invention relates to a process for preparing perfluorinated sulfonic resin solution by using discarded total-fluorinion film as raw material, loading in turn into 3-60% inorganic acid, water solution of ethylenediaminetetraacetic acid disodium salt having a concentration of 0.05-0.3mol / L, steeping in water solution of sodium hydroxide having a concentration of 0.1-2mol / L, loading into container with solvent, thermal insulating 0.5-18 hours at 150-280 deg. C at the presence of inactive gas.

Description

technical field [0001] The invention relates to a method for preparing a perfluorosulfonic acid resin solution, in particular to a method for preparing a perfluorosulfonic acid resin solution from waste perfluorinated ion membranes in the chlor-alkali industry. Background technique [0002] Caustic soda produced by ion membrane method has become the mainstream of industrial caustic soda production because of its advantages of low energy consumption, high quality caustic soda and no pollution. With the continuous expansion of the production scale of caustic soda produced by ionic membrane method, the waste ionic membrane produced every year is also increasing exponentially. [0003] At present, the treatment methods for waste ion membranes in the chlor-alkali industry are incineration or landfill. Whether it is incineration (a large amount of toxic and harmful gases will be produced during the incineration process) or landfill (due to the good chemical stability of the perfl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/08
CPCY02W30/62
Inventor 许振良郎万中童蔚石卫
Owner EAST CHINA UNIV OF SCI & TECH
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