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Method for preparing high-purity quaternary ammonium hydroxide by electrolyzing organic ammonium salt with perfluorinated ion exchange membrane in chlor-alkali

A perfluorinated ion, quaternary ammonium base technology, applied in electrolytic organic production, electrolytic process, organic diaphragm, etc., can solve the problem of resistance to nascent chlorine atom oxidation, poor resistance to electrolysis environment and strong alkali resistance, unable to meet production needs and other problems, to achieve the effect of strong electrochemical corrosion resistance, simple method and high current efficiency

Inactive Publication Date: 2012-12-19
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The ion-exchange membrane with selective permeation characteristics for ions was used in the early stage as a cross-linked ion-exchange resin with a hydrocarbon polymer as the skeleton. This membrane is resistant to the oxidation ability of nascent chlorine atoms, electrolytic environment and The ability of strong alkali is poor, which cannot meet the actual production needs

Method used

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  • Method for preparing high-purity quaternary ammonium hydroxide by electrolyzing organic ammonium salt with perfluorinated ion exchange membrane in chlor-alkali
  • Method for preparing high-purity quaternary ammonium hydroxide by electrolyzing organic ammonium salt with perfluorinated ion exchange membrane in chlor-alkali
  • Method for preparing high-purity quaternary ammonium hydroxide by electrolyzing organic ammonium salt with perfluorinated ion exchange membrane in chlor-alkali

Examples

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Effect test

Embodiment 1

[0053] A method for preparing quaternary ammonium base by electrolysis, by using an electrolytic cell with a perfluorinated ion-exchange membrane 3 arranged between electrodes and mainly composed of an anode chamber 4, an anode 1, a perfluorinated ion-exchange membrane 3, a cathode 2, and a cathode chamber 5, Follow these steps:

[0054] (1) in such as figure 1 Electrochemical ion exchange is carried out in the ion-exchange membrane electrolyzer shown, the cathode 2 electrode is a nickel-based mesh electrode, the anode 2 electrode is a titanium-based mesh electrode, and the perfluorinated ion exchange membrane 3 is DF988 perfluorocarboxylic acid for chlor-alkali — Perfluorosulfonic acid composite membrane ion membrane;

[0055] The anolyte is an aqueous solution of tetramethylammonium chloride, and the catholyte is a tetramethylammonium hydroxide (TMAH) solution; pump the anolyte and catholyte into the anode chamber and the cathode chamber of the electrolytic cell respectivel...

Embodiment 2

[0059] (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 active coating), the anode electrode is a titanium-based mesh electrode, and the ion membrane is DF988 perfluorocarboxylic acid for chlor-alkali — Perfluorosulfonic acid composite ion membrane;

[0060] The anolyte is an aqueous solution of trimethylbenzyl ammonium chloride, and the catholyte is an aqueous solution of trimethylbenzyl ammonium hydroxide; pump the anolyte and catholyte into the anode chamber and cathode chamber of the electrolytic cell for circulation;

[0061] (2) At 55°C, apply direct current to the electrolytic cell for constant current electrolysis, with a current density of 3kA / m 2 , the concentration of the anolyte entering the tank is controlled at a mass concentration of about 30%; the mass concentration of the catholyte entering the tank is 29%, and the mass concentrat...

Embodiment 3

[0064] Same as Example 1, the difference is that the ionic membrane used in step (1) is F8020 type chlor-alkali ionic membrane. The calculation shows that the cathodic current efficiency of this process is 97.31%, and the purity of the quaternary ammonium base tetramethylammonium hydroxide is more than 99.69%.

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Abstract

The invention relates to a method for preparing quaternary ammonium hydroxide by electrolyzing organic ammonium salt with perfluorinated ion exchange membrane in chlor-alkali. By using an electrolytic tank which is constituted by providing a perfluorinated ion exchange membrane between electrodes and mainly consists of an anode compartment, a positive electrode, a perfluorinated ion exchange membrane, a negative electrode and a cathode compartment, and the method provided by the invention comprises the following steps: supplying the anode and cathode liquid to the anode and cathode compartment of the electrolytic tank respectively to perform electrochemical ion exchange, wherein the anode liquid is aqueous solution of quaternary ammonium salt, and the cathode liquid is quaternary ammonium hydroxide solution corresponding to quaternary ammonium ion of said quaternary ammonium salt; performing constant current electrolyzation by supplying direct current to the electrolytic tank, and conducting concentrating and crystallizing treatment on the outlet solution of the cathode electrode to obtain quaternary ammonium hydroxide. The method provided by the invention has simple technical process and high current efficiency, is easy to performing industrial amplification, so that the quaternary ammonium hydroxide obtained has high purity.

Description

technical field [0001] The invention relates to an electrochemical synthesis method of a quaternary ammonium base, in particular to a method for preparing a quaternary ammonium base by electrolyzing an organic ammonium salt with a chlor-alkali perfluorinated ion exchange membrane method, and belongs to the field of electrochemical synthesis. Background technique [0002] Quaternary ammonium bases are a class of general formula R 1 R 2 R 3 R 4 Compounds of NOH, where R 1 , R 2 , R 3 and R 4 It is four identical or different aliphatic or aromatic hydrocarbon groups. The molecular structure is similar to ammonium hydroxide, which can be regarded as the latter NH 4 + The derivative obtained by substituting the middle hydrogen is strongly alkaline, easy to deliquescence, soluble in water and 100% ionized. Quaternary ammonium bases play an important role in organic synthesis and inorganic synthesis. For example, tetramethylammonium hydroxide (TMAH) is a strong base with ...

Claims

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Application Information

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IPC IPC(8): C25B3/00C25B13/08
Inventor 张恒王学军于昌国张永明
Owner SHANDONG DONGYUE POLYMER MATERIAL
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