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

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The manufacturing method
of biphenol
1. Introduction

biphenol is an important organic chemical raw material, widely used in medicine, pesticides, dyes, spices and other fields. Due to its unique chemical properties and wide range of applications, the manufacturing methods of biphenol have attracted much attention. This article will introduce the manufacturing method of biphenol in detail, including raw material preparation, reaction process, post-treatment and other processes.

2. raw material preparation

the production of biphenol requires the use of phenol as a raw material. Phenol is a common organic compound, which can be obtained by coal tar fractionation or petrochemical industry. In the process of raw material preparation, it is necessary to ensure the purity and quality of phenol to avoid adverse effects on subsequent reactions.

3. reaction process

1. acylation reaction

phenol and acylating agent (such as acetic anhydride) mixed, heated to a certain temperature, the acylation reaction, the generation of phenol acetate. The reaction needs to be carried out in the presence of an acidic catalyst such as sulfuric acid.

2. Friedel-Crafts reaction

phenol acetate and another molecule of phenol under the action of acidic catalyst, Friedel-Crafts reaction, the generation of biphenol acetate. This step is a key step in the production of diphenol, and it is necessary to control the reaction temperature and time appropriately to ensure the progress of the reaction and the purity of the product.

3. hydrolysis reaction

biphenol acetate is hydrolyzed under alkaline conditions to generate biphenol and acetate. The hydrolysis reaction requires the use of an alkaline catalyst such as sodium hydroxide and is carried out at a certain temperature and pressure.

4. post-treatment
After the
reaction is completed, the product needs to be post-treated to obtain biphenol with higher purity. The post-treatment process includes washing, extraction, distillation and the like to remove by-products and impurities in the reaction. The final biphenol product needs to go through quality inspection and meet the relevant standards before it can be used.

5. Precautions

1. In the manufacturing process, it is necessary to strictly control the reaction conditions of each step, such as temperature, time, catalyst dosage, etc., to ensure the progress of the reaction and the purity of the product.
2. Quality inspection of raw materials and products is required to ensure compliance with relevant standards and requirements.
3. The produced biphenol should be stored in a dry, cool place, away from direct sunlight and high temperature.

6. Conclusion The manufacturing method of

biphenol includes raw material preparation, acylation reaction, Friedel-Crafts reaction, hydrolysis reaction and post-treatment. In the manufacturing process, it is necessary to strictly control the reaction conditions of each step to ensure the purity and quality of the product. As an important organic chemical raw material, biphenol has broad application prospects in the fields of medicine, pesticide, dye, spice and so on.

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