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Method for preparing organic acid by electrolyzing organic acid salt on basis of chlor-alkali perfluor ion exchange membrane

A technology of organic acid salts and perfluorinated ions, which is applied in the direction of electrolysis process, electrolysis components, electrolysis organic production, etc., can solve the problems of low total yield, long production cycle, cumbersome operation process, etc., and achieve improved electrolysis current density, durability The effect of strong electrochemical corrosion and high current efficiency

Active Publication Date: 2015-03-18
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Organic acids usually go through organic acid salt steps or intermediate forms during the synthesis process, such as tartaric acid (2,3-dihydroxysuccinic acid) goes through sodium tartrate intermediates during the preparation process, usually through calcium precipitation and sulfuric acid dissolution Transformation, cation exchange column, anion exchange column, concentration and crystallization and other complex process procedures, due to the cumbersome operation process, long production cycle, relatively low total yield, and a large amount of calcium chloride, sulfuric acid and other raw materials are consumed in the production process , which increases the production cost, and also introduces a large amount of impurities such as calcium and sulfate

Method used

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  • Method for preparing organic acid by electrolyzing organic acid salt on basis of chlor-alkali perfluor ion exchange membrane
  • Method for preparing organic acid by electrolyzing organic acid salt on basis of chlor-alkali perfluor ion exchange membrane
  • Method for preparing organic acid by electrolyzing organic acid salt on basis of chlor-alkali perfluor ion exchange membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0051] A method for electrolytic preparation of organic acid salts, by using an electrolytic cell with a perfluorinated ion exchange membrane 3 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:

[0052] Use 20% mass concentration of sodium tartrate aqueous solution as anolyte, 20% mass concentration of sodium hydroxide aqueous solution as catholyte; figure 1 In the ion-exchange membrane electrolyzer shown, it is supplied to the anode chamber and the cathode chamber of the electrolyzer respectively, wherein the perfluorinated ion-exchange membrane 3 is a domestic DF988 chlor-alkali ion-exchange membrane; with a current density of 3kA / m 2 Conduct electrolysis with direct current and control the mass concentration of the lye out of the tank to 24%; collect the anolyte out of the tank, concentrate and crystallize to obtain tartaric acid crystals with a purity...

Embodiment 2

[0054] Use 30% mass concentration of sodium fumarate (sodium fumarate) aqueous solution as anolyte, and 29% mass concentration of sodium hydroxide aqueous solution as catholyte; after preheating to 60°C, use a pump to figure 1 In the ion-exchange membrane electrolyzer shown, it is supplied to the anode chamber and the cathode chamber of the electrolyzer respectively, wherein the perfluorinated ion-exchange membrane 3 is a domestic DF988 chlor-alkali ion-exchange membrane; at a current density of 4.5kA / m 2 Conduct electrolysis with direct current and control the mass concentration of the lye out of the tank to about 31%; collect the anolyte out of the tank, and process it through concentration and crystallization to obtain fumaric acid crystals with a purity of 99.96%. The current efficiency η was calculated to be 97.4%.

Embodiment 3

[0056] As described in Example 1, the difference is that the anolyte is potassium malate with a mass concentration of 25%, and the catholyte is potassium hydroxide with a mass concentration of 20%. The purity of malic acid crystals obtained was 99.95%; the current efficiency η was calculated to be 97.4%.

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Abstract

The invention relates to a method for preparing an organic acid by electrolyzing an organic acid salt on the basis of a chlor-alkali perfluor ion exchange membrane. According to the method, an electrolytic bath which is equipped with a perfluor ion exchange membrane between electrodes and is mainly composed of an anode chamber, an anode, the perfluor ion exchange membrane, a cathode and a cathode chamber is adopted. The method comprises the following steps: respectively supplying an anode solution and a cathode solution to the anode chamber and the cathode chamber of the electrolytic bath and performing electrochemical ion exchange, wherein the anode solution is an aqueous solution of the organic acid salt and the cathode solution is an alkali solution corresponding to cations in the organic acid salt; applying a direct current to the electrolytic bath so as to perform constant current electrolysis, and combining the anions in the organic acid salt solution enriched in the anode chamber with hydrogen ions generated by the anode chamber, thereby generating the organic acid; and collecting discharged solution containing the organic acid enriched in the anode chamber, concentrating and crystallizing, thereby obtaining the high-purity organic acid. The method has the advantages of simple process, easiness in industrial amplification, high current efficiency, and the like, and can realize the industrial preparation for the high-purity organic acid.

Description

technical field [0001] The invention relates to an electrochemical synthesis method of an organic acid, in particular to a method for preparing an organic acid by electrolyzing an organic acid salt with a chlor-alkali perfluorinated ion exchange membrane method, and belongs to the field of organic electrochemistry. Background technique [0002] Organic acids usually go through organic acid salt steps or intermediate forms during the synthesis process, such as tartaric acid (2,3-dihydroxysuccinic acid) goes through sodium tartrate intermediates during the preparation process, usually through calcium precipitation and sulfuric acid dissolution Transformation, cation exchange column, anion exchange column, concentration and crystallization and other complex process procedures, due to the cumbersome operation process, long production cycle, relatively low total yield, and a large amount of calcium chloride, sulfuric acid and other raw materials are consumed in the production proc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B3/00C25B13/00
Inventor 张永明王学军于昌国张恒
Owner SHANDONG DONGYUE POLYMER MATERIAL
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