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Simple and easy stripping method of composite ion exchange membrane for chloroalkali industry

A technology of ion exchange membrane and chlor-alkali industry, which is applied in the field of polymer functional membrane materials and can solve problems such as high pressure and easy volatility

Active Publication Date: 2012-05-23
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both use water / alcohol as solvent to recover perfluorosulfonic acid resin through autoclave. However, because the operation is carried out at high temperature, the water / alcohol system is relatively easy to volatilize, resulting in high pressure in the device.
In addition, not all research and recovery units have the conditions to use autoclaves

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Pretreatment: Take the discarded perfluorocarboxylic acid-sulfonic acid composite membrane used in the chlor-alkali industry and cut it into a membrane with a width of 8cm and a length of 40cm; put it into a 2000ml beaker, and use 5% by mass hydrochloric acid Soak in an aqueous solution at 25°C for 4.5 hours, and then gently scrub the surface of the membrane with a brush to remove dirt and metal ions;

[0027] (2) Soaking in strong acidic aqueous solution: the pretreated perfluorinated ion exchange membrane is soaked in 5% sulfuric acid aqueous solution at room temperature for 100 minutes to convert the membrane to hydrogen type;

[0028] (3) Alcohol / water solution immersion: The membrane treated in step (2) is immersed in isopropanol / water solution with a mass ratio of 40 / 60, and left for 30 minutes at room temperature.

[0029] (4) Take out the membrane and wash it with deionized water until the washing solution is neutral.

[0030] (5) Start rubbing and tearing from the ...

Embodiment 2

[0032] (1) Pretreatment: Take the waste perfluorocarboxylic acid-sulfonic acid composite membrane used in the chlor-alkali industry and cut it into a membrane with a width of 30cm and a length of 80cm; put it into a 2000ml beaker and use 10% hydrochloric acid with a mass percentage concentration of 10%. Soak in the aqueous solution at 30°C for 3 hours, and then gently scrub the surface of the membrane with a brush to remove dirt and metal ions.

[0033] (2) The pretreated perfluorinated ion exchange membrane is soaked in a 10% hydrochloric acid aqueous solution at room temperature for 12 hours to convert the membrane to a hydrogen form;

[0034] (3) Alcohol / water solution immersion: immerse the membrane treated in step (2) in a 50 / 50 mass ratio ethanol / water solution, and heat it to 70°C for 20 minutes;

[0035] (4) Take out the diaphragm and wash it with deionized water until the washing liquid is neutral;

[0036] (5) Start rubbing and tearing from the edge or foaming place, first s...

Embodiment 3

[0038] (1) Pretreatment: Take the discarded perfluorocarboxylic acid-sulfonic acid composite membrane used in the chlor-alkali industry and cut it into a membrane with a width of 20cm and a length of 100cm; put it into a 2000ml beaker, and use 8% hydrochloric acid with a mass percentage concentration. Soak in an aqueous solution at 30°C for 1 hour, and then gently scrub the membrane surface with a brush to remove dirt and metal ions on it;

[0039] (2) The pre-treated perfluorinated ion exchange membrane is soaked in a 6% nitric acid aqueous solution at room temperature for 24 hours to convert the membrane to hydrogen type;

[0040] (3) Alcohol / water solution immersion: immerse the membrane treated in step (2) in ethylene glycol / water solution with a mass ratio of 40 / 60 and leave it at room temperature for 50 minutes;

[0041] (4) Take out the diaphragm and wash it with deionized water until the washing liquid is neutral;

[0042] (5) Start rubbing and tearing from the edge or foaming...

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Abstract

The invention belongs to the field of polymer functional membrane material, in particular to a method for stripping a composite ion exchange membrane for the chloroalkali industry by simple treatment. The method comprises the following concrete treatment steps: pretreating a perfluorinated ion exchange membrane with certain width and enough length for the chloroalkali industry; then immersing thepretreated perfluorinated ion exchange membrane with strongly acidic water solution; immersing a diaphragm with isopropanol / water solution and carrying out ultrasound at a certain temperature; and taking out the diaphragm, washing the diaphragm with deionized water and separating the diaphragm into a perfluorocarboxylic acid layer, a perfluorinated sulfonic layer and a reinforced mesh.

Description

Technical field: [0001] The invention belongs to the field of polymer functional membrane materials, and specifically relates to a method capable of peeling off a composite ion exchange membrane used in the chlor-alkali industry through simple processing. Background technique: [0002] The chlor-alkali industrial ion-exchange membrane method has been recognized as a directional chlor-alkali production process, which is characterized by energy saving, high quality, basically no pollution, and low production costs and investment. Ion exchange membranes are the core of chlor-alkali industrial membrane production of caustic. The cation exchange membranes currently used in the electrolysis of salt water solutions can be divided into perfluorosulfonic acid membranes, perfluorocarboxylic acid membranes and perfluorocarboxylic acid membranes according to their ion exchange groups. Acid-sulfonic acid composite membrane. The ion membrane can be used as a single-layer membrane or a multila...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B17/00C08J11/04
CPCY02P20/143Y02W30/62
Inventor 王学军张永明张恒刘小宁
Owner SHANDONG DONGYUE POLYMER MATERIAL