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

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The manufacturing method
of chlorinated phenol
chlorinated phenol is a kind of important organic chemical raw material, which is widely used in pesticide, medicine, dye and other fields. This paper will introduce the manufacturing method of chlorinated phenol, including raw material preparation, reaction process, post-treatment and so on.

1. Raw Material Preparation

The manufacture of chlorinated phenols requires phenol and chlorine as raw materials. In order to ensure the smooth progress of the reaction, it is necessary to purify phenol and chlorine separately to remove impurities.

2. reaction process

1. chlorination reaction

The purified phenol and chlorine gas are added into the reactor according to a certain proportion, and the reaction temperature is controlled within a suitable range to carry out the chlorination reaction. The chlorination reaction is an exothermic reaction, and it is necessary to control the reaction rate and temperature to avoid overheating and the formation of by-products.

2. Washing and separation

After the reaction is completed, the reaction solution is washed with alkali liquor to remove acidic by-products and excess chlorine gas therein. The chlorophenol and the organic phase are then separated by extraction with an organic solvent.

3. Purification by Distillation

The isolated chlorophenol is further purified by distillation. In the process of distillation, it is necessary to control the temperature and pressure to avoid the decomposition and loss of the product.

3. post-treatment

1. Wastewater treatment
The wastewater produced in the
manufacturing process contains acidic by-products and organic solvents, which need to be treated to meet environmental protection standards and discharged. Commonly used treatment methods include neutralization, oxidation, biochemical treatment, etc.

2. Waste gas treatment
The waste gas generated in the
manufacturing process mainly contains unreacted chlorine and volatile organic compounds, which need to be treated to meet environmental protection standards. Commonly used treatment methods include absorption, adsorption, combustion, etc.

4. precautions

1. During the chlorination reaction, attention should be paid to controlling the temperature and reaction rate to avoid the formation of by-products and equipment damage.

2. Washing separation process need to control the concentration and dosage of lye, avoid waste and environmental pollution.

3. Distillation purification process needs to control the temperature and pressure, to avoid product decomposition and loss.

4. The treatment of waste water and waste gas needs to meet national environmental protection standards to ensure the sustainability of the production process.

In short, the manufacture of chlorinated phenol needs to control the process parameters and operation process of each link to ensure product quality and environmental protection. At the same time, it is necessary to strengthen the safety management and protective measures in the production process to ensure the smooth progress of the production process.

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