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Process for preparing perfluorinated sulfonic resin solution by using waste ion exchange membrane in chlor-alkali industry

A technology of perfluorosulfonic acid resin and ion exchange membrane, applied in the direction of educt, recycling technology, plastic recycling, etc., can solve problems such as environmental pollution, and achieve the effect of wide application range, improved purity and high purity

Active Publication Date: 2008-12-24
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Nowadays, when the performance of the ion-exchange membrane used in the chlor-alkali industry is degraded, the usual practice is to repair the membrane or use it as waste to burn or bury it, which pollutes the environment. be recycled

Method used

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  • Process for preparing perfluorinated sulfonic resin solution by using waste ion exchange membrane in chlor-alkali industry
  • Process for preparing perfluorinated sulfonic resin solution by using waste ion exchange membrane in chlor-alkali industry
  • Process for preparing perfluorinated sulfonic resin solution by using waste ion exchange membrane in chlor-alkali industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The waste membrane used in the chlor-alkali industry is composed of four parts: perfluorosulfonic acid ion exchange membrane, perfluorocarboxylic acid ion exchange membrane, PTFE reinforced mesh, and a small amount of inorganic substances. Among them, perfluorosulfonic acid resin is a copolymer formed by copolymerization of tetrafluoroethylene and perfluorovinyl ether, and its ion exchange capacity is 1100g / mol. The surface of the waste ionic membrane is covered with soil, organic impurities and inorganic impurities, etc., and it is dark yellow or reddish brown.

[0043] First of all, it is necessary to repeatedly scrub the waste ionic membrane with a brush to remove most of the inorganic substances attached to the waste membrane. Cut the waste film into 10*10cm 2 small pieces.

[0044] Then, at a temperature of 80°C, a concentration of 1 mol / L H 2 SO 4 Treat for about 1 h in order to remove the inorganic precipitates on the membrane. The membrane was taken out and...

Embodiment 2

[0057] As described in Example 1, a mixed resin of perfluorosulfonic acid and perfluorocarboxylic acid was obtained. Take 15g of mixed resin and put it into a 0.5L autoclave, then add 140ml of isopropanol, 30ml of ethanol and 130ml of deionized water. Will N 2 The tube was connected to the reactor and a thermocouple was inserted into the reactor. Access to N 2 Confirm that the reaction kettle is well sealed, open the gas phase valve, and discharge the gas in the reaction kettle. When the pointer of the pressure gauge shows 0, close the gas phase valve. This process is repeated many times until O 2 content less than 10 -6 until. O contained in the air in the reactor 2 After fully exhausted, pass into N 2 , the pointer shows 3MPa, turn off N 2 valve. Turn on the control power switch to start heating and dissolving.

[0058] Dissolve at 250°C for 5 hours, when the pressure shows 12.1MPa, turn off the power, let the kettle temperature drop slowly at room temperature unt...

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Abstract

The invention discloses a method for preparing perfluoro sulfonic resin with abandoned ion exchange membrane in alkali-chloride industry, comprising following steps: swelling said abandoned ion with lower alcohol, emulsifying it with emulsion machine to resin particle, adding alcohol / water solvent and resin particle into autoclave, dissolving resin particle under high temperature and pressure and protection of nitrogen; getting solid mixture of perfluoro sulfonic resin and solution, separating with solid-liquid separation method and getting perfluoro sulfonic resin solution and solid perfluoro sulfonic resin. The resin solution is characterized by transparent, low content of foreign matter, high purity, similar property to that of Nafion EW 1100 solution, usage in field of mending ionic membrane pinhole and other mechanical damage, preparation of fuel battery proton exchange membrane and stereoscopic electrode and chemical catalysis.

Description

technical field [0001] The invention relates to a method for preparing a perfluorosulfonic acid resin solution from waste ion exchange membranes in the chlor-alkali industry. Background technique [0002] Perfluorosulfonic acid resin is a good conductor of hydrogen ions and a polymer of electronic insulators. Due to its excellent mechanical, thermal, chemical and electrochemical stability, it has been widely used in fuel Battery , electrolysis device, sewage treatment, chemical catalysis, photocatalysis, gas separation, and compound membrane with carboxylic acid membrane to prepare chlor-alkali industrial membrane, etc. It has advantages that other resins cannot match. In addition to the above application fields, perfluorosulfonic acid resins can also be used in electronic components, biosensors, organic electrochemistry, organic synthesis, biomedicine, etc. At the same time, as the key material of the future zero-emission, pollution-free and clean energy-proton exchange...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/04
CPCY02P20/143Y02W30/62
Inventor 徐洪峰阳贻华林治银张海林宋书范侯中军
Owner SUNRISE POWER CO LTD
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