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[Chemical Knowledge]：Production and manufacturing method and process flow of p-tert-butyl phenol

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P-tert-butylphenol (PTBP) is an important chemical raw material, which is widely used in antioxidants, stabilizers, spices and other fields. This article will introduce the manufacturing method of p-tert-butyl phenol, including raw material preparation, reaction process, post-treatment and so on.

1. Raw Material Preparation

The main raw materials for the manufacture of p-tert-butylphenol are phenol and isobutylene. Among them, phenol is a common chemical raw material, which can be extracted from coal tar or petroleum. Isobutene can be prepared by naphtha cracking or propylene dimerization.

2. reaction process

1. alkylation reaction

Phenol and isobutylene are alkylated under the action of acidic catalyst to generate p-tert-butyl phenol. Commonly used acidic catalysts include sulfuric acid, phosphoric acid, hydrofluoric acid, and the like. During the reaction, temperature, pressure and material ratio need to be controlled to ensure the smooth progress of the reaction and the purity of the product.

2. Dehydration Reaction
After the
alkylation reaction is completed, the product needs to be dehydrated to remove the water generated by the reaction. The dehydration operation is usually carried out using an adsorbent such as a molecular sieve or alumina.

3. Post-Treatment

1. Washing and Separation
After the
dehydration is complete, the product needs to be washed to remove residual catalyst and impurities. Commonly used detergents include water and lye. After the washing is completed, the product is separated from impurities by distillation, crystallization, etc., to obtain p-tert-butylphenol with high purity.

2. Refining and Packaging

In order to improve the purity and quality of the product, it is necessary to refine the isolated p-tert-butylphenol, such as recrystallization, distillation, etc. After the refining is completed, the product is packaged to meet the needs of different fields.

4. precautions

1. In the manufacturing process, it is necessary to strictly control the reaction conditions to avoid the formation of by-products and ensure the purity and yield of the product.
2. p-tert-butyl phenol has certain toxicity and irritation, and safety protection measures should be paid attention to during operation to avoid harm to human body and environment.

In short, the manufacturing method of p-tert-butylphenol includes raw material preparation, alkylation reaction, dehydration reaction, post-treatment and other links. In the process of operation, it is necessary to pay attention to safety, environmental protection and other issues to ensure the quality of products and the smooth progress of production.

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