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Glyoxylic acid continuous oxidation process

An oxidation process, glyoxylic acid technology, applied in organic chemistry, carboxylate preparation, chemical instruments and methods, etc., can solve the problems of poor product quality stability, frequent process operations, and high equipment usage, and achieve stable product quality. Good performance, high selectivity and yield, and the effect of reducing production costs

Inactive Publication Date: 2019-04-26
BROTHER ENTERPRISES HLDG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The production process of the glyoxal nitric acid oxidation method all adopts the kettle-type batch oxidation method. This process is frequently operated, the product quality stability is poor, the equipment usage is large, and the production cost is high.

Method used

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  • Glyoxylic acid continuous oxidation process

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Embodiment

[0026] A kind of glyoxylic acid continuous oxidation technique, the structure of the device that this technique adopts is as figure 1 As shown, it is composed of a preheater 1, an initiation kettle 2, a first oxidation kettle 3, a second oxidation kettle 4, a holding kettle 5 and a cooler 6 connected in sequence, and the preheater is also connected with a mixer 7, and the mixer is used for Mix hydrochloric acid, initiator and glyoxal.

[0027] 100kg of glyoxal aqueous solution with mass concentration of 40wt%, 10kg of hydrochloric acid aqueous solution with mass concentration of 31wt%, and 10kg of nitric acid aqueous solution with mass concentration of 10wt% are continuously mixed through a mixer and heated to 60°C by a heater. Enter the initiator tank, and at the same time, dropwise add nitric acid with a mass concentration of 60wt% at a rate of 25kg per minute under continuous stirring conditions, and then the reaction will begin, and the reaction temperature will be control...

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Abstract

The invention relates to a glyoxylic acid production process, in particular to a glyoxylic acid continuous oxidation process, and belongs to the technical field of chemical synthesis. The process comprises the following steps: fully and evenly mixing glyoxal, a cocatalyst and an initiator which are accurately measured to obtain a mixture A; after preheating by a preheater, feeding the mixture A into an initiation kettle for reaction with nitric acid to obtain a reaction solution; then feeding the reaction solution into a first oxidation kettle, a second oxidation kettle and a thermal insulation kettle which are connected in series sequentially to complete oxidation reaction; after cooling by a cooler, obtaining an oxidation solution, and performing concentration dehydration, crystallization for oxalic acid removal and dechlorination to obtain teh glyoxylic acid finished product, wherein the molar ratio of glyoxal, nitric acid, the cocatalyst and the initiator is 1:0.3-0.4:0.2-0.3:0.01-00.2. The process is safer and more efficient, can reduce the production cost and improve stability of product quality, and is an industrial glyoxylic acid production process which is easy to operatecontinuously.

Description

technical field [0001] The invention relates to a glyoxylic acid production process, in particular to a glyoxylic acid continuous oxidation process, which belongs to the technical field of chemical synthesis. Background technique [0002] Glyoxylic acid is an important chemical raw material, mainly used as a flavoring agent and fixative for cosmetics, and for pharmaceuticals. There are currently 4 commonly used preparation methods, specifically: [0003] 1. Oxalic acid electrolysis The oxalic acid aqueous solution is electrolytically reduced to produce a dilute glyoxylic acid solution, which is then gradually concentrated by evaporation, concentration, freezing, and filtration, and finally qualified products are packaged. [0004] 2. Glyoxal oxidation method Glyoxal is oxidized by air or oxygen under the action of a catalyst to generate glyoxylic acid, and then refined and purified to obtain the finished product. In addition, dichloroacetic acid is condensed with sodium me...

Claims

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Application Information

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IPC IPC(8): C07C51/27C07C59/147
CPCC07C51/27C07C59/147
Inventor 张贵峰马则欣倪宏亮周中平钱志达
Owner BROTHER ENTERPRISES HLDG CO LTD
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