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[Chemical Knowledge]：Production and manufacturing method and process of dimethylol propionic acid

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Dimethylol propionic acid (DMPA) is an important chemical raw material, which is widely used in synthetic resins, plastics, fibers, pharmaceuticals, pesticides and other fields. The following is the manufacturing method of dimethylol propionic acid:

1. raw material preparation

1. propionic acid: propionic acid is the main raw material for the manufacture of dimethylol propionic acid, which can be obtained by petrochemical raw material cracking or fermentation.
2. Formaldehyde: As another raw material for the reaction, formaldehyde can be obtained by oxidation or methanol dehydrogenation.
3. Sodium hydroxide: used to adjust the pH value of the reaction system and promote the reaction.

2. synthesis reaction

1. according to a certain molar ratio of propionic acid and formaldehyde into the reaction kettle, stirring evenly.
2. Sodium hydroxide is added to the reaction system to adjust the pH value to alkaline environment, so as to promote the hydroxymethylation reaction of formaldehyde and propionic acid.
3. under a certain temperature and pressure, keep the reaction time, make the propionic acid and formaldehyde fully react to generate dimethylol propionic acid.

3. Post-treatment

1. After the reaction is completed, the reaction solution is cooled to room temperature, and the pH value is adjusted to neutral or acidic.
2. Impurities and by-products in the reaction system are removed by centrifugation, filtration and the like.
3. Distilling the filtrate to recover the unreacted raw materials to obtain the crude dimethylol propionic acid with high purity.

4. purification

1. The crude dimethylol propionic acid was further purified to improve product quality.
2. Recrystallization, distillation and other methods to remove impurities and by-products in the product.
3. After passing the test, obtain high purity dimethylol propionic acid products.

The above is an overview of the manufacturing method of dimethylolpropionic acid. During the specific operation, the process parameters need to be adjusted according to the actual situation to ensure the quality and yield of the product. At the same time, pay attention to safety in the production process, abide by relevant laws and regulations, and ensure environmental protection and sustainable development.

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