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Method for preparing sodium glyoxylate by coupled reverse osmosis technology

A sodium glyoxylate and reverse osmosis technology, applied in the separation/purification of carboxylic acid compounds, electrolysis process, organic chemistry, etc., can solve the problems of high energy consumption, lead electrode deactivation, etc., and achieve low current efficiency and low energy consumption cost , the effect of lifting constraints

Active Publication Date: 2019-06-07
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems of high energy consumption and lead electrode deactivation in the current oxalic acid electrolysis process for preparing glyoxylic acid, the present invention provides a process for preparing sodium glyoxylate by oxalic acid electrolysis with low electrolysis energy consumption and better lead electrode stability

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  • Method for preparing sodium glyoxylate by coupled reverse osmosis technology
  • Method for preparing sodium glyoxylate by coupled reverse osmosis technology

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Experimental program
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Embodiment 1

[0029] Electrolysis process: the cathode of the electrolytic cell is made of pure lead electrode (lead content 0.9999), the anode is DSA electrode, the electrode spacing is 1cm, the catholyte feed is 6% oxalic acid solution, and the catholyte is fed into the electrolyzer from the catholyte high level tank, and the feed rate is 1300g / h , current density 1000A / m 2 , the electrode surface flow velocity is 0.2m / s, the electrolyte temperature is controlled at 20°C, and the residence time of the reaction solution is 0.77h. Keep the concentration of sulfuric acid in the anode electrode tank at 10%. After electrolysis, the anode and cathode reaction solutions are pumped back to the anolyte high level tank and catholyte high level tank respectively, and deionized water is replenished in the anolyte high level tank. After electrolysis, the catholyte discharge speed is the same as the feed speed, the glyoxylic acid content of the discharge liquid is 1.1%, and the oxalic acid concentrati...

Embodiment 2

[0032] Electrolysis process: the cathode of the electrolytic cell is made of pure lead electrode (pure lead content 0.9999), the anode is DSA electrode, the electrode spacing is 1cm, the catholyte feed is 12% oxalic acid solution, and the catholyte is fed into the electrolyzer from the catholyte high level tank, and the feed rate is 750g / h, current density 1000A / m 2 , the electrode surface flow velocity is 0.2m / s, the electrolyte temperature is controlled at 25°C, and the residence time of the reaction solution is 1h. Keep the concentration of sulfuric acid in the anode electrode tank at 10%. After electrolysis, the anode and cathode reaction solutions are pumped back to the anolyte high level tank and catholyte high level tank respectively, and deionized water is replenished in the anolyte high level tank. After electrolysis, the catholyte discharge speed is the same as the feed speed, the glyoxylic acid content of the discharge liquid is 2%, and the oxalic acid concentrati...

Embodiment 3

[0035] Electrolysis process: the cathode of the electrolytic cell is made of pure lead electrode (pure lead content 0.9999), the anode is DSA electrode, the electrode spacing is 1cm, the catholyte feed is 8% oxalic acid solution, and the catholyte is fed into the electrolyzer from the catholyte high level tank, and the feed rate is 1000g / h, current density 1000A / m 2 , the electrode surface flow velocity is 0.2m / s, the electrolyte temperature is controlled at 20°C, and the residence time of the reaction solution is 1h. Keep the concentration of sulfuric acid in the anode electrode tank at 10%. After electrolysis, the anode and cathode reaction solutions are pumped back to the anolyte high level tank and catholyte high level tank respectively, and deionized water is replenished in the anolyte high level tank. After electrolysis, the catholyte discharge speed is the same as the feed speed, the glyoxylic acid content of the discharge liquid is 1.5%, and the oxalic acid concentra...

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Abstract

The invention relates to a method for preparing sodium glyoxylate by a coupled reverse osmosis technology, in particular to a technological process for electrolytic preparation of sodium glyoxylate, and relates to a concentration process of sodium glyoxylate produced after an electrolysis reaction and a neutralization reaction by introducing reverse osmosis, and a recovery and utilization processof oxalic acid after electrolysis by introducing electrodialysis. A low concentration reaction liquid is subjected to concentration treatment by a reverse osmosis process, and an electro synthesis process of sodium glyoxalate with a high electrolyte concentration is realized. High electrolyte concentration is conducive to reducing an operating voltage of an electrolyzer, the current efficiency andlead electrode stability in a reaction process are improved, and the comprehensive cost of a product is reduced, so that the method has a good industrialization prospect.

Description

technical field [0001] The invention relates to a technical process for preparing sodium glyoxylate by electrolysis, which belongs to the field of organic electrochemical synthesis. Background technique [0002] Glyoxylic acid and its sodium salt, sodium glyoxylate, have important applications in the field of flavors and fragrances, such as the synthesis of vanillin and ethyl vanillin, and the field of medical intermediates, such as the synthesis of allantoin. Patent US4146731 reports a process for preparing glyoxylic acid by oxidizing glyoxal with nitric acid. Due to the harsh reaction conditions, the side reactions are difficult to suppress, the selectivity of the target product is poor, the consumption of nitric acid is large, and a lot of nitric acid remains in the product. remove. Moreover, nitric acid is seriously corrosive to equipment, and NOx produced in the reaction process is the main source of acid rain, which is easy to cause environmental pollution. Patent CN...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/12C07C51/42C07C59/147C25B3/13
Inventor 刘释水杜旺明钱向阳李俊平张少伟
Owner WANHUA CHEM GRP CO LTD