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Method for preparing high-purity peroxysulphate based on electrolytic oxidation through ion-exchange membrane electrolyzer for chlor-alkali production

A chlor-alkali ion membrane, persulfate technology, applied in the electrolysis process, electrolysis components, organic diaphragms, etc., can solve the problems of low current efficiency, caustic soda consumption, single product, etc., to achieve low power consumption, strong electrochemical corrosion resistance , the effect of high current efficiency

Active Publication Date: 2013-01-16
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method for the electrolytic preparation of sulfate used in this patent document still has weak points: 1. the current efficiency is still low, and the current efficiency is only 80.3%-87.2% in general from all its embodiments; 2. the caustic soda generated is consumed , instead of being produced separately as a widely used product, resulting in a single product and low production efficiency

Method used

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  • Method for preparing high-purity peroxysulphate based on electrolytic oxidation through ion-exchange membrane electrolyzer for chlor-alkali production
  • Method for preparing high-purity peroxysulphate based on electrolytic oxidation through ion-exchange membrane electrolyzer for chlor-alkali production
  • Method for preparing high-purity peroxysulphate based on electrolytic oxidation through ion-exchange membrane electrolyzer for chlor-alkali production

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Experimental program
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Effect test

Embodiment 1

[0066] A method for preparing high-purity persulfate by electrolysis, by using an electrolysis in which a perfluorinated ion exchange membrane 3 is arranged between electrodes and is mainly composed of an anode chamber 4, an anode 1, a perfluorinated ion exchange membrane 3, a cathode 2, and a cathode chamber 5. Slot, follow the steps below:

[0067] (1) In such figure 1 Electrochemical ion exchange is carried out in the ion-exchange membrane electrolyzer shown, the cathode electrode is a nickel-based mesh electrode with active coating, the anode electrode is a titanium-based mesh electrode, and the fluorine ion exchange membrane 3 is a DF988 type perfluorinated chlor-alkali Carboxylic acid-perfluorosulfonic acid composite membrane ion membrane, effective area 50cm 2 ;

[0068] (2) The anolyte raw material is a 30% mass concentration ammonium sulfate aqueous solution, and the catholyte raw material is a 28% mass concentration ammonium hydroxide solution; pump the anode and cathode ...

Embodiment 2

[0074] (1) In such figure 1 Electrochemical ion exchange is carried out in the ion-exchange membrane electrolyzer shown. The cathode electrode is a stainless steel-based mesh electrode with active coating, the anode electrode is a titanium-based mesh electrode, and the perfluorinated ion exchange membrane 3 is a DF2801 chlor-alkali full Fluorocarboxylic acid-perfluorosulfonic acid composite membrane ion membrane, effective area 50dm 2 ;

[0075] (2) The anolyte is an aqueous solution of sodium sulfate and the catholyte is a sodium hydroxide solution; the anolyte and catholyte raw materials are preheated to 35°C, and then the anolyte and catholyte are pumped into the anode compartment of the electrolytic cell. And in the cathode chamber;

[0076] (3) At 45℃, apply direct current to the electrolytic cell for constant current electrolysis, the current density is 3.5kA / m 2 , The anolyte entering the tank sulfate mass concentration is controlled at 40%, the flow rate is 9.66L / h; the cat...

Embodiment 3

[0080] Same as Example 1, the difference is that the current density in step (3) is 3.5kA / m 2 .

[0081] After data processing, the current efficiency of this process is 98.47%, the power consumption is 2210kWh / t, and the purity of the product ammonium persulfate is >99.72%.

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Abstract

The invention relates to a method for preparing high-purity peroxysulphate based on electrolytic oxidation through an ion-exchange membrane electrolyzer for chlor-alkali production. According to the method, a perfluorinated ion exchange membrane is arranged between electrodes, and the electrolyzer comprises an anode compartment, an anode, the perfluorinated ion exchange membrane, a cathode and a cathode compartment. The method comprises the following steps: an anolyte sulfate aqueous solution and a catholyte alkali solution are respectively supplied to the anode compartment and the cathode compartment of the electrolyzer to conduct electrochemical ion exchange, the electrolyzer is charged with direct current to conduct constant current electrolysis, sulphate ions in the sulphate solution are enriched in the anode compartment because of not passing through the ion-exchange membrane, and are migrated on the anode in the anode direction to discharge to generate sulfate radicals, the sulfate radicals are combined with M<+> to generate sulfate, and the anode out-of-electrolyzer solution is subjected to after treatment to obtain high-purity peroxysulphate. The method overcomes the defects that in the prior art, the energy consumption is high, and the current efficiency is low, is simple in process, achieves high current efficiency and low energy consumption, and is easy to realize industrial production.

Description

Technical field [0001] The invention relates to an electrochemical synthesis method of persulfate, in particular to a method for electrolyzing sulfate to synthesize persulfate based on the perfluorinated ion exchange membrane method of a chlor-alkali ion membrane electrolyzer, and belongs to the field of inorganic electrochemical synthesis. Background technique [0002] Persulfates mainly include ammonium persulfate, sodium persulfate and potassium persulfate, collectively referred to as alkali metal persulfates, and are widely used. Such as ammonium persulfate ((NH 4 ) 2 S 2 O 8 , Also known as ammonium peroxodisulphate, Ammonium peroxodisulphate, APS) is the ammonium salt of peroxodisulphate. Peroxodisulfate contains a peroxy group and is a strong oxidant. The most important application of persulfate is emulsion polymerization in aqueous solution. Persulfide acts as an initiator for the free radical formation of artificial rubber or latex polymer. It can be used as an initiat...

Claims

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Application Information

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IPC IPC(8): C25B1/28C25B9/06C25B9/08C25B13/08C25B9/17C25B9/19
Inventor 于昌国王学军张恒
Owner SHANDONG DONGYUE POLYMER MATERIAL
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