Method for continuously preparing glyoxylic acid through oxalic acid electrolysis

Abstract

The invention discloses a method for continuously preparing glyoxylic acid through oxalic acid electrolysis, which comprises a cathode storage tank, a cathode storage tank, an anode storage tank, a cathode gas-liquid separation tank, an anode gas-liquid separation tank and a plurality of electrolytic cell modules,the electrolytic cell modules are equally divided into anode chambers and cathode chambers, one end of each cathode chamber and the output end of the cathode storage tank are connected with a cathode feeding header pipe, and a cathode pump and a cathode feeding valve are arranged between the two ends of the cathode feeding header pipe. According to the invention, free switching between intermittent operation and continuous operation is realized through switching of connection modes of the plurality of electrolytic cell modules, and the purpose of continuous production is finally achieved: the plurality of electrolytic cell modules are connected in parallel, so that the catholyte is subjected to a rapid circular reaction between the cathode storage tank and the electrolytic cell, and after the concentration of glyoxylic acid in the catholyte reaches a set value, and switching is carried out to a series connection mode, and the circulation is closed to carry out continuous production.

Description

technical field [0001] The invention belongs to the technical field of organic electrolysis, in particular to a method for continuously preparing glyoxylic acid by electrolysis of oxalic acid. Background technique [0002] Glyoxylic acid is an important chemical raw material and intermediate, which is widely used in the fields of medicine, pesticide, spices, papermaking, food additives and biochemistry. At present, it is mainly used in the production of broad-spectrum antibiotic amoxicillin, spice vanillin, antihypertensive drug atenolol, cosmetic additive allantoin, high value-added aromatic aldehydes and pesticide intermediates. The industrial production methods of glyoxylic acid mainly include glyoxal nitric acid oxidation method, oxalic acid electrolytic reduction method and maleic anhydride ozone oxidation method, and industrial products are usually 40% or 50% glyoxylic acid aqueous solution. Due to the low product concentration and high production cost of the oxalic a...

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Problems solved by technology

[0006] Chinese published patent CN112725825A solves the above problems, develops a process method that can carry out continuous industrial production, and keeps the current efficiency at a high value, but this process There are still the following deficiencies: ① A small amount of hydrogen and oxygen produced by electrolysis, if there are no treatment measures, part of the gas will be discharged into the atmosphere, and there will be explosion hazards in industrial production

Another small part of the gas is carried by the electrolyte into the buffer tank and other downstream equipment, and finally brought back to the electrolytic cell to reduce the current efficiency; The size or quantity of the buffer tank indirectly restricts the production capacity of the device; ③The application of the cathode buffer tank has a certain energy-saving effect, but there are too many solution preparation tanks in the front stage, which will increase the equipment and operating costs accordingly

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