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[Chemical Knowledge]：Manufacturing method and process of glyoxal

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Glyoxal manufacturing method

Glyoxal is an important organic compound, which is widely used in chemical industry, medicine, pesticide and other fields. In the field of chemical production of raw materials, glyoxal manufacturing methods are mainly the following:

1. oxidation

oxidation method is one of the main methods of production of glyoxal, the principle is ethylene glycol or ethylene diamine and other raw materials for oxidation reaction, the generation of glyoxal and water. Commonly used oxidants include hydrogen peroxide, nitric acid, potassium permanganate, etc. Among them, the oxidation method using hydrogen peroxide as an oxidant is more commonly used, because hydrogen peroxide has a high oxidation ability and the water generated by the reaction is pollution-free. The production process of

oxidation method generally includes the steps of raw material ratio, oxidation reaction, separation and purification. Among them, the ratio of raw materials is one of the key factors affecting the yield of glyoxal, which needs to be optimized according to the nature of different raw materials and reaction conditions. At the same time, the control of the oxidation reaction temperature and time also needs to be adjusted according to the specific situation to ensure the progress of the reaction and the quality of the product.

2. condensation method

condensation method is acetaldehyde and formaldehyde in acidic conditions for condensation reaction, glyoxal and water. Commonly used acidic catalysts include sulfuric acid, hydrochloric acid, etc. The reaction conditions of the condensation method are relatively mild, but it is necessary to control the reaction temperature and pH value to avoid the formation of by-products and the decomposition of the product. The production process of the

condensation method generally includes the steps of raw material ratio, condensation reaction, neutralization, separation and purification. Among them, the control of raw material ratio and reaction conditions is the key factor affecting the yield and purity of glyoxal, which needs to be optimized according to the experimental data.

3. acetylene method

acetylene method is acetylene and formaldehyde in the alkaline conditions of the addition reaction, the generation of glyoxal and hydrogen. Commonly used alkaline catalysts include sodium hydroxide, potassium hydroxide, etc. The reaction conditions of the acetylene method are relatively harsh and need to be carried out under high temperature and high pressure conditions, but the purity of the generated glyoxal is relatively high. The production process of

acetylene method generally includes the mixing of acetylene and formaldehyde, addition reaction, separation and purification steps. Among them, the control of reaction conditions and the choice of catalyst are the key factors affecting the yield and purity of glyoxal, which need strict experimental verification and optimization.

In general, the manufacturing method of glyoxal needs to be selected and optimized according to specific raw materials and reaction conditions. Different manufacturing methods have different advantages and disadvantages and scope of application, which need to be comprehensively considered and selected according to the actual situation. At the same time, it is necessary to strictly control the process parameters in the production process to ensure product quality and output.

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