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

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The manufacturing method
of pivalic acid
pivalic acid is an important organic chemical raw material, which is widely used in medicine, pesticide, spice, dye and other fields. This article will introduce the manufacturing method of pivalic acid, including raw material preparation, reaction process, post-treatment and so on.

1. Raw Material Preparation

The main raw materials for the manufacture of pivalic acid are isobutyraldehyde and formaldehyde. Among them, isobutyraldehyde can be obtained by petroleum cracking or biological fermentation, and formaldehyde can be obtained by methanol oxidation or formaldehyde aqueous solution evaporation. In the process of raw material preparation, it is necessary to ensure the purity and concentration of raw materials to avoid adverse effects on subsequent reactions.

2. reaction process

The manufacturing method of pivalic acid mainly adopts aldehyde condensation method, that is, isobutyraldehyde and formaldehyde are condensed under acidic conditions to generate pivalaldehyde, and then pivalaldehyde is converted into pivalic acid by oxidation reaction. The specific reaction process is as follows:

1. condensation reaction

under the action of acidic catalyst, isobutyraldehyde and formaldehyde condensation reaction, the generation of pivalaldehyde and water. Commonly used acidic catalysts include sulfuric acid, hydrochloric acid, and the like. The reaction temperature is generally controlled at 60-80°C and the reaction time is about 2-4 hours.

2. Oxidation reaction

pivalaldehyde is then converted to pivalic acid by oxidation reaction. The oxidizing agent is generally hydrogen peroxide or air oxygen. The reaction temperature is controlled at 60-80°C and the reaction time is about 2-3 hours. In the oxidation process, it is necessary to control the addition rate of the oxidizing agent and the reaction temperature to avoid excessive oxidation or side reactions.

3. Post-Treatment
After the end of the
reaction, the reaction solution needs to be post-treated to obtain pivalic acid with high purity. The post-treatment process includes neutralization, extraction, distillation and other steps.

1. Neutralization

Add an alkaline absorbent to the reaction solution to react with the remaining acidic catalyst and adjust the pH to neutral. Commonly used alkaline absorbents include sodium hydroxide, sodium carbonate, and the like.

2. Extraction

The neutralized reaction solution is extracted with an organic solvent to separate pivalic acid and an organic phase. Commonly used organic solvents include benzene, toluene, and the like. In order to improve the extraction efficiency of pivalic acid, the extraction temperature and solvent ratio should be controlled.

3. Distillation

The organic phase of pivalic acid after extraction is distilled to separate pure pivalic acid product. The distillation temperature and pressure need to be controlled during the distillation process to avoid the decomposition of pivalic acid or the occurrence of side reactions.

Through the above steps, a pivalic acid product with higher purity can be produced. It should be noted that in the entire manufacturing process, the operating conditions and parameters of each link need to be strictly controlled to ensure product quality and yield.

In summary, the manufacturing method of pivalic acid mainly includes the steps of raw material preparation, condensation reaction, oxidation reaction and post-treatment. By mastering reasonable manufacturing process and operation skills, we can produce high-quality pivalic acid products, which provide important raw material support for medicine, pesticides, spices, dyes and other fields.

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