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[Chemical Knowledge]：Production process and preparation method of p-chlorophenol

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As a versatile organic compound, p-chlorophenol is widely used in chemical industry, medicine and daily chemicals. This article will introduce the production process and preparation method of chlorophenol.

1. of the production process of chlorophenol

1. chlorobenzene and sodium hydroxide method: chlorobenzene and sodium hydroxide in a certain proportion into the reaction kettle for reaction, generation of chlorophenol. The process is simple, the purity of the reaction product is high, but the environmental pollution is large.

2. p-chlorobenzoic acid and sodium hydroxide method: p-chlorobenzoic acid and sodium hydroxide mixture are heated to react to obtain p-chlorophenol as a reduced product. The purity of the reaction product is high, but the demand for sodium is large.

3. dichlorobenzene and sodium hydroxide method: dichlorobenzene and sodium hydroxide are added into the reaction kettle, and p-chlorophenol is obtained by hydrolysis reaction. The reaction product of this method has high purity, but waste and solid particles will be produced in the reaction, which is not conducive to subsequent process treatment.

of the above three processes need to control the reaction temperature, pressure and the ratio of reactants in the reaction process to improve the reaction efficiency and product purity.

2. of the preparation method of chlorophenol

1. reduction method of preparation of chlorophenol: the chlorobenzoic acid and hydrogen in the role of platinum catalyst reduction to chlorophenol. The reaction process of this method is environmentally friendly and has a high purity, but requires a high catalyst.

2. Preparation of p-chlorophenol by direct carbothermal reduction method: After chlorobenzene and sodium sulfide are mixed, p-chlorophenol is generated by carbothermal reaction. The reaction conditions are mild, but the purity and yield of the reaction product are low.

3. chlorinated solvent reduction method for the preparation of p-chlorophenol: chlorobenzene was mixed and dissolved in alane, and reacted with sodium hydroxide to obtain the reduction product p-chlorophenol. The reaction process of this method is relatively easy to control, but the requirement of solvent is higher.

In general, the preparation method of p-chlorophenol is still in continuous exploration and improvement. According to different production needs and conditions, different preparation methods need to be selected and applied according to the actual situation.