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[Chemical Knowledge]：Production and manufacturing method and process flow of trimethylolpropane

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Trimethylolpropane (TMP) is an important chemical raw material, widely used in coatings, resins, plastics, oil additives and other fields. Its manufacturing method mainly includes catalytic hydrogenation method, formaldehyde condensation method, glyoxylic acid method and so on. This article will introduce these three manufacturing methods in detail, and discuss their advantages and disadvantages and scope of application.

1. catalytic hydrogenation method

catalytic hydrogenation method is based on glycerol as raw material, through the action of the catalyst, with hydrogen addition reaction, the generation of trimethylolpropane. The method has mild reaction conditions, simple operation and high product purity. However, the catalyst cost is high, needs to be replaced regularly, and produces a certain amount of waste water and waste gas.

1. process principle

glycerol in the role of catalyst, with hydrogen addition reaction, the generation of trimethylolpropane. The reaction equation is as follows:

CH2OH-CHOH-CH2OH H2 → CH2(OH)CH2(OH)CH2OH

2. Process flow

Glycerol and a catalyst are added into a reactor, hydrogen is introduced, the reaction temperature and pressure are controlled, and trimethylolpropane is generated by the reaction. After completion of the reaction, a product having a relatively high purity is obtained through steps such as filtration and distillation.

2. Formaldehyde condensation method

Formaldehyde condensation method is based on formaldehyde and glycerol as raw materials, through the action of acidic catalyst, condensation reaction, the generation of trimethylolpropane. The method is easy to obtain raw materials, low cost, but the operation is more complex, the product purity is low.

1. process principle

under the action of acidic catalyst, formaldehyde and glycerol condensation reaction, generating trimethylolpropane. The reaction equation is as follows:

3CH2OH-CHOH-CH2OH 3HCHO → CH2(OH)CH2(OH)CH2OH 3 H2O

2. Process flow

Glycerol, formaldehyde and acidic catalyst are added into the reactor, the reaction temperature and pH value are controlled, and trimethylolpropane is generated by the reaction. After completion of the reaction, a product is obtained through steps such as filtration, neutralization and distillation.

3. glyoxylic acid method

glyoxylic acid method is based on glyoxylic acid, formaldehyde and hydrogen as raw materials, through the action of the catalyst, the occurrence of addition and condensation reaction, generating trimethylolpropane. The raw materials of the method are easy to obtain, the reaction conditions are mild, but the catalyst cost is high.

1. process principle

under the action of the catalyst, glyoxylic acid and formaldehyde addition reaction, the formation of intermediate products, and then with hydrogen addition reaction, and ultimately the formation of trimethylolpropane. The reaction equation is as follows:

CH3COCHO HCHO → CH3C(OH)(CHO)CH2OH
CH3C(OH)(CHO)CH2OH H2 → CH2(OH)CH2(OH)CH2OH

2. Process flow

Glyoxylic acid, formaldehyde and catalyst are added into a reactor, hydrogen is introduced, the reaction temperature and pressure are controlled, and trimethylolpropane is generated. After completion of the reaction, a product having a relatively high purity is obtained through steps such as filtration and distillation.

In summary, the three manufacturing methods have their own advantages and disadvantages and scope of application. The catalytic hydrogenation method has high product purity and is suitable for areas with high product quality requirements; the formaldehyde condensation method has low cost and is suitable for large-scale production; the glyoxylic acid method has easy access to raw materials and mild reaction conditions and is suitable for production on specific occasions. In actual production, the appropriate manufacturing method can be selected according to specific needs and conditions.

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