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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 and other directions, can solve the problems of low current efficiency, low production efficiency, caustic soda consumption, etc., to achieve high current efficiency, low power consumption, resistance to Strong electrochemical corrosion effect

Active Publication Date: 2015-06-17
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 electrolytic electrolysis method 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, proceed as follows:

[0067] (1) in such as figure 1 Electrochemical ion exchange is carried out in the ionic 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 fluoride ion exchange membrane 3 is DF988 type chlor-alkali perfluorinated Carboxylic acid-perfluorosulfonic acid composite membrane ion membrane, effective area 50cm 2 ;

[0068] (2) the anolyte raw material is an aqueous solution of 30% mass concentration ammonium sulfate, and the catholyte raw material is 28% mass concentration ammonium hydroxide solution; the anod...

Embodiment 2

[0074] (1) in such as figure 1 Electrochemical ion exchange is carried out in the ionic membrane electrolyzer shown, the cathode electrode is a stainless steel-based mesh electrode with an active coating, the anode electrode is a titanium-based mesh electrode, and the perfluorinated ion exchange membrane 3 is a DF2801 type chlor-alkali all-purpose electrode. 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; first preheat the raw materials of the anolyte and catholyte to 35°C, and then pump the anolyte and catholyte into the anode chamber of the electrolytic cell and in the cathode compartment;

[0076] (3) At 45°C, apply direct current to the electrolytic cell for constant current electrolysis, with a current density of 3.5kA / m 2 , the sulfate mass concentration of the anolyte entering the tank is controlled...

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, belonging to the field of inorganic electrochemical synthesis. Background technique [0002] Persulfate mainly includes ammonium persulfate, sodium persulfate and potassium persulfate, collectively referred to as alkali metal persulfate, which is 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 peroxy group, which is a strong oxidizing agent. The most important application of persulfates is emulsion polymerization in aqueous solution, where persulfides act as initiators of free radical formation in elastomeric or latex polymers. It can be used as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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