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Method for recovering perfluorosulfonic acid resin from waste membrane

A technology of perfluorosulfonic acid resin and recycling method, applied in the direction of plastic recycling and recycling technology, can solve the problem of high cost of diaphragm, and achieve the effects of excellent product performance, low product cost and sufficient sources

Inactive Publication Date: 2019-07-30
CHAOYANG HUADING ENERGY STORAGE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a perfluorosulfonic acid resin recycling method for waste diaphragms, which can solve the problem of high cost of existing diaphragms by adopting low-cost perfluorosulfonic acid resin technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this example, the waste proton exchange membrane was cleaned with deionized water, treated with sulfuric acid (concentration: 20wt%, temperature: 80°C) for 30min and hydrogen peroxide (concentration: 3wt%, temperature: 60°C) for 30min, and 90°C under normal pressure Dried in the air, crushed to a particle size of 50 mesh raw materials. Add 2kg of pulverized raw materials into 50L N,N-dimethylformamide organic solvent, heat to 200°C for 2 hours, filter to obtain a uniform and clear resin solution, and volatilize the solvent to obtain a solid resin.

[0030] The purity of the perfluorosulfonic acid resin recovered in this embodiment is 99wt%.

Embodiment 2

[0032] In this embodiment, the waste ion exchange membrane was cleaned with deionized water, soaked in ethanol (concentration: 10wt%, temperature: 30°C) for 30min, hydrolytic bacteria (concentration: 10 11 cfu / mL, the temperature is 30°C), the treatment time is 2h, the raw material is dried in nitrogen at 100°C under normal pressure, and crushed to a particle size of 50 mesh. Dissolve 10kg of pulverized raw materials in 200L of N-ylpyrrolidone, heat to 180°C for 2 hours, filter to obtain a uniform and clear resin solution, and then concentrate to 40L in a reactor.

[0033] The perfluorosulfonic acid resin solution recovered in this embodiment has a concentration of 20 wt% and a purity of 99 wt%.

Embodiment 3

[0035] In this example, the waste ion-exchange membrane was cleaned with deionized water, treated with ethanol (concentration: 20wt%, temperature: 25°C) for 20min and potassium permanganate aqueous solution (concentration: 5wt%, temperature: 50°C) for 30min, Dry and pulverize the raw materials at 80°C in normal pressure air until the particle size is 200 mesh. Dissolve 10 kg of pulverized raw materials and 1 kg of polyimide in 50 L of isopropanol, heat to 180 ° C for 2.5 h, filter to obtain a uniform and clear resin solution, and distill the film-forming solution to 10 L under reduced pressure.

[0036] The concentration of the perfluorosulfonic acid resin solution recovered in this embodiment is 30wt%, and the purity is 98.5wt%.

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Abstract

The invention relates to the field of proton exchange membranes and resins thereof, in particular to a method for recovering a perfluorosulfonic acid resin from a waste membrane. The waste ion exchange membrane containing the perfluorosulfonic acid resin is taken as a core raw material for preparing the perfluorosulfonic acid resin. Firstly, the raw material is physically cleaned and then chemically treated and biologically treated to remove dirt and various impurities on the surface of the raw material, drying and crushing are conducted, and a solvent is adopted for resin extraction. According to the method, with the waste proton exchange membrane as the raw material, on one hand, the problem of difficult treatment of the raw material as dangerous solid waste is solved; on the other hand,the problem of high cost of the ion exchange membrane is solved. The performance of the prepared product is comparable to that of similar products on the market, the cost is far lower than that of the similar products, composition and structural design are conducted according to target demands, and the method has great significance for the wider application of the ion exchange membrane.

Description

technical field [0001] The invention relates to the field of proton exchange membranes and resins thereof, in particular to a method for recycling perfluorosulfonic acid resins of waste diaphragms. Background technique [0002] The chlor-alkali industry is one of the important fields for the application of perfluorosulfonic acid ion-exchange membranes, and it is also the source of the core raw materials for this project. Since 1999, my country has set off a climax of caustic soda expansion, and the chlor-alkali industry occupies an important position in my country's national economy. So far, the production capacity of my country's main chlor-alkali products such as PVC and caustic soda has ranked first in the world, and the production capacity is still increasing. In 2017, the output of caustic soda in my country was 3365.2 tons, and 1 million square meters of waste ion exchange membranes were eliminated. These waste diaphragms (waste ion exchange membranes) are dangerous s...

Claims

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Application Information

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IPC IPC(8): C08J11/16C08J11/10
CPCC08J11/10C08J11/16Y02W30/62
Inventor 陈晖赵丽娜彭海泉肖伟吴慧哲
Owner CHAOYANG HUADING ENERGY STORAGE TECH
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