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[Chemical Knowledge]：Production and manufacturing method and process of dichloromethane

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of the manufacturing method
of dichloromethane Dichloromethane is an important raw material widely used in chemical production, with excellent solvent performance and chemical stability. Its manufacturing methods mainly include chloromethane method, natural gas chlorination method, methanol method, etc. This article will detail these three manufacturing methods.

1. Methyl chloride method

Methyl chloride method is based on methyl chloride as raw material, through the chlorination reaction of dichloromethane. This method has the advantages of easy access to raw materials and simple process, but a large amount of hydrogen chloride gas will be produced in the production process, which requires corresponding processing equipment. The specific steps of

are as follows:

1. Methyl chloride gas is introduced into a chlorination reactor to control a certain temperature and pressure.
2. Chlorine gas is introduced to chlorinate with methyl chloride to generate dichloromethane and hydrogen chloride gas.
3. The methylene chloride is separated from the reaction mixture by cooling and separation equipment to obtain a product of higher purity.

2. natural gas chlorination process

natural gas chlorination process is natural gas as raw material, through the chlorination reaction to produce methylene chloride. This method has the advantages of abundant raw materials and low cost, but a large number of by-products will be produced in the production process, which requires corresponding separation equipment.

specific steps are as follows:

1. natural gas into the chlorination reactor, control a certain temperature and pressure.
2. Chlorine gas is introduced and chlorinated with methane in natural gas to generate dichloromethane, chloroform, carbon tetrachloride and other chlorides.
3. The methylene chloride is separated from the reaction mixture by rectification and separation equipment to obtain a product of higher purity.

3. methanol method

methanol method is methanol as raw material, through dehydrogenation and chlorination reaction of dichloromethane. This method has the advantages of easy availability of raw materials and mild reaction conditions, but a large amount of water and acidic waste gas will be produced in the production process, which requires corresponding treatment equipment. The specific steps of the

are as follows:

1. methanol gas is introduced into a dehydrogenation reactor, and dehydrogenation reaction occurs under the action of a high temperature and a catalyst to generate formaldehyde and hydrogen.
2. Formaldehyde gas is introduced into the chlorination reactor, a certain temperature and pressure are controlled, and chlorine gas is introduced into the chlorination reaction to generate dichloromethane and water.
3. The methylene chloride is separated from the reaction mixture by cooling and separation equipment to obtain a product of higher purity. At the same time, the water and acidic waste gas produced need to be treated accordingly to avoid environmental pollution.

Each of the above three methods has its advantages and disadvantages, and the choice of which method depends on the specific production conditions and resources. In the actual production process, it is also necessary to consider the selection of equipment, the optimization of process flow and the disposal of waste, so as to ensure the economy, environmental protection and safety of the production process. In addition, with the continuous progress of science and technology and the continuous improvement of environmental protection requirements, the manufacturing method of dichloromethane is also constantly improved and optimized, and more efficient and environmentally friendly manufacturing methods may appear in the future.

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