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[Chemical Knowledge]：Production and manufacturing method and process flow of o-isopropyl phenol

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The manufacturing method
of o-isopropyl phenol
o-isopropyl phenol (o-Isopropylphenol, referred to as OPP) is an important chemical raw material, widely used in fungicides, antioxidants, antioxidant preservatives, spices, pesticide stabilizers and other fields. This article will introduce the manufacturing method of o-isopropyl phenol in detail, including raw material preparation, reaction process, post-treatment and precautions.

1. raw material preparation

1. Phenol: Phenol is the main raw material of o-isopropyl phenol and should have high purity to ensure product quality.
2. Acetone: Acetone acts as an alkylating agent and reacts with phenol to produce o-isopropyl phenol.
3. catalyst: usually choose acid catalyst, such as sulfuric acid, phosphoric acid and so on.

2. reaction process

The manufacturing process of o-isopropyl phenol mainly includes two steps: alkylation reaction and neutralization reaction.

1. alkylation reaction: under the action of catalyst, phenol and acetone alkylation reaction, generate o-isopropyl phenol. The reaction temperature is controlled at 60-80°C and the reaction time is about 4-6 hours. Constant stirring is required during the reaction to ensure adequate contact of the starting materials.
2. Neutralization reaction: After the reaction is completed, the reaction solution is neutralized with alkali to remove the remaining acidic catalyst. It was then washed with water until neutral to give crude o-isopropylphenol.

3. Post-treatment

1. Distillation: Distillation of the crude ortho-isopropyl phenol, collecting the product of the specified fraction to obtain ortho-isopropyl phenol with higher purity.
2. Crystallization: If it is necessary to further improve the purity of the product, the product after distillation can be crystallized. During the crystallization process, the cooling rate should be controlled to obtain larger crystal particles.
Precautions for
4.

1. Strictly control the quality of raw materials to ensure product purity.
2. During the reaction, proper stirring speed should be maintained to avoid excessive local concentration of raw materials.
3. During the neutralization reaction, the speed of adding lye should be controlled to prevent local alkali.
4. Distillation process to maintain a proper degree of vacuum, to avoid product decomposition.
5. During the crystallization process, the cooling rate should be controlled to obtain larger crystal particles and improve the purity of the product.

5. waste treatment and environmental protection measures

in the production process will produce some waste, such as waste catalyst, waste lye and so on. These wastes should be properly disposed of to avoid environmental pollution. The specific treatment method can select the appropriate environmental protection technology for treatment according to the actual situation, such as waste catalyst can be recycled, waste lye can be discharged after neutralization treatment, etc.

In addition, we should pay attention to energy conservation and emission control in the production process, adopt low-energy production equipment and processes, reduce energy consumption and waste emissions in the production process, and improve production efficiency and environmental protection.

In summary, the manufacturing process of o-isopropyl phenol requires strict control of raw material quality, reaction conditions and post-treatment processes to improve product purity and yield. At the same time, it is necessary to strengthen environmental awareness and waste treatment measures, protect the environment and resources, and achieve green and sustainable production.

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