Electrode activation treatment process for preparing glyoxylic acid through oxalic acid electrolysis and reduction

A technology of activation treatment and glyoxylic acid, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of easy passivation of lead electrolysis, unstable production, low current efficiency, etc., achieve good electrolysis performance and solve frequent cleaning problems Effect

Inactive Publication Date: 2017-06-09
姜蕾
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at problems such as easy passivation of lead electrolysis, fragile diaphragm, low current efficiency and unstable production in the current process of preparing glyoxylic acid by electrolytic reduction of oxalic acid, the present invention proposes a cheap and practical electrode activation treatment process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Using plexiglass electrolytic cell, the effective electrolysis area is 12X 18cm 2 , separated by a cation exchange membrane in the middle, the anode and cathode are self-made lead electrodes with a purity of 99.9%. A production cycle is 8h.

[0015] Start the circulating pump equipped with activating solution (I), inject the activating solution (I) into the cathode and anode chambers simultaneously, maintain the temperature of the activating solution at 15-25° C., and stop the pump after circulating for 10 min. Activation solution (I) is to be prepared by adding 150L concentrated nitric acid to 850mL tap water. Start the circulating pump that activating solution (II) is housed, and activating solution (II) is squeezed into the cathode and anode chamber, maintain 30~40 DEG C of activating solution temperature, stop pump after circulating 20min. The activation solution (II) is prepared by dissolving 40g NaOH and 40g sodium citrate in appropriate amount of water and dilu...

Embodiment 2

[0018] Using plexiglass electrolytic cell, the effective electrolysis area is 12X 18cm 2 , separated by a cation exchange membrane in the middle, the anode and cathode are self-made lead electrodes with a purity of 99.9%. A production cycle, 8h.

[0019] Start the circulation pump that activation solution (I) is housed, push activation solution (I) into cathode and anode chamber simultaneously, maintain activation solution temperature 15~25 DEG C, stop pump after circulation 15min, activation solution (I) is made of 200L concentrated Add nitric acid to 850mL tap water to prepare. Start the circulating pump that activating solution (II) is housed, activating solution (II) is squeezed into negative and anode chambers, maintain 30~40 ℃ of activating solution temperature, stop pumping after circulation 30min, activating solution (II) is made of 50gNaOH and 80g Sodium edetate is dissolved in appropriate amount of water and diluted to 1L. Wash the cathode and anode chambers with ...

Embodiment 3

[0022] Using plexiglass electrolytic cell, the effective electrolysis area is 12X 18cm 2 , separated by a cation exchange membrane in the middle, the anode and cathode are self-made lead electrodes with a purity of 99.9%. A production cycle, 8h.

[0023] Start the circulation pump that activation solution (I) is housed, push activation solution (I) into cathode and anode chamber simultaneously, maintain activation solution temperature 15~25 DEG C, stop pump after circulation 20min, activation solution (I) is made of 160L concentrated Add nitric acid to 850mL tap water to prepare. Start the circulating pump that activating solution (II) is housed, activating solution (II) is squeezed into the cathode and anode chamber, maintain activating solution temperature 30~40 DEG C, stop pump after circulating 10min, activating solution (II) is made of 50gNaOH and 85g Potassium Sodium Tartrate is dissolved in appropriate amount of water and diluted to 1L. Wash the cathode and anode cha...

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PUM

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Abstract

The invention provides an electrode activation treatment process for preparing glyoxylic acid through oxalic acid electrolysis and reduction, and belongs to the field of electrode activation treatment processes. The electrode activation treatment process comprises the following steps: every time after an electrolysis cell works for 8-10 h, a certain time is controlled and two activation solutions are adopted for alternate treatment under the external drive, wherein the two activation solutions are prepared from different components. According to the electrode activation treatment process, a passivation film on the electrode surface is quickly dissolved, activated lead atoms are exposed, and then the purpose of activation is fulfilled, mainly because hydroxy carboxylate or amino carboxyl compounds and other complexing agents in the activation solutions have complexing capabilities with lead ions; after 90 continuous production cycles of the electrolysis cell subjected to the electrode activation treatment process, the current efficiency of the electrolysis cell is still kept at 75% or above; the continuous and stable production in a process for preparing glyoxylic acid by adopting an electrolysis method is achieved; and meanwhile, the service life of an iron film can be prolonged by 3-4 times and the activation solutions can be repeatedly used, thereby greatly reducing the production cost.

Description

technical field [0001] The invention relates to an electrode activation treatment process, in particular to an electrode activation treatment process in the preparation of glyoxylic acid by electrolytic reduction of oxalic acid. Background technique [0002] Glyoxylic acid is a versatile and important intermediate in organic synthesis, widely used in the industrial production of fine chemicals such as medicine, spices, and pesticides. At present, the industrial production of glyoxylic acid in my country mainly includes nitric acid oxidation of glyoxal and cathodic electrolysis of oxalic acid. The former will be gradually eliminated due to the complex reaction system, low product purity, and serious environmental pollution. The latter is a promising process with cheap raw materials, simple reaction, easy separation of products, high quality, and no pollution problems. [0003] In the 1980s, foreign countries began to study the oxalic acid electrolysis process, and domestical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/04C25B11/04C25B15/00C25B3/25
Inventor 姜蕾
Owner 姜蕾
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