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

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of the manufacturing method
of benzyl chloride Benzyl chloride is an important organic chemical raw material, which is widely used in pesticides, pharmaceuticals, spices and other fields. This article will introduce the manufacturing method of benzyl chloride, including the reaction principle, process flow, equipment selection, operation points, safety and environmental protection.

1. reaction principle

benzyl chloride manufacturing method mainly uses benzene and chlorine as raw materials, through the substitution reaction. The specific reaction equation is as follows:

C6H6Cl2 → C6H5Cl HCl

2. Process
The manufacturing process of
benzyl chloride mainly includes the following steps:

1. Feeding: Benzene and chlorine are put into the reactor in a certain proportion.

2. reaction: in the reactor, benzene and chlorine in the role of the catalyst to replace the reaction, the formation of benzyl chloride and hydrogen chloride gas.

3. Condensation: The reaction product is condensed by a condenser, and benzyl chloride liquid and hydrogen chloride gas are separated.

4. washing: washing benzyl chloride liquid with lye to remove acidic impurities.

5. Layering: The washed benzyl chloride liquid is allowed to stand for layering, and the lower waste lye and the upper benzyl chloride product are separated.

6. distillation: through distillation, further purification of benzyl chloride products, high purity of benzyl chloride.

3. equipment selection

benzyl chloride manufacturing need to choose the appropriate reactor and condenser. The reactor should use equipment with good sealing performance and stirring performance to ensure the normal progress of the reaction. The condenser should be a tube or plate condenser with high efficiency to ensure the quality and yield of the product.

4. operation points

1. Control the feeding ratio: The feeding ratio of benzene and chlorine should be controlled within a certain range to ensure the progress of the reaction and the quality of the product.

2. Control the reaction temperature: The reaction temperature should be controlled within a suitable range to avoid the effect of too high or too low on the reaction.

3. Control the stirring speed: The stirring speed should be appropriate to ensure the full mixing of the reactants and the uniformity of the reaction.

4. Control the concentration and dosage of washing lye: The concentration and dosage of washing lye should be controlled within a certain range to ensure the purity and yield of the product.

5. safety and environmental protection
There are certain safety risks and environmental pollution problems in the manufacturing process of
benzyl chloride. Therefore, in actual production, the following measures should be taken to control:

1. Strengthen equipment maintenance and overhaul to ensure the normal operation and sealing performance of the equipment.

2. Strengthen on-site safety management, prohibit fireworks and open fire operations, and prevent fire and explosion accidents.

3. Strengthen the treatment and recycling of waste gas and waste liquid to reduce environmental pollution.

In short, the manufacturing method of benzyl chloride needs to master the reaction principle, process flow, equipment selection, operation points and other aspects, while strengthening safety and environmental protection management, in order to ensure product quality and production safety and stability.

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