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[Chemical Knowledge]：The production and manufacturing method and process of decabromodiphenyl ethane.

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The manufacturing method
of decabromodiphenyl ethane
decabromodiphenyl ethane (Decabromodiphenyl, referred to as DBDPE) is an important chemical production raw material, widely used in flame retardants, plastic additives and other fields. This paper will introduce the manufacturing method of decabromodiphenyl ethane in detail, including the reaction principle, process flow, equipment selection and so on.

1. reaction principle

the manufacture of decabromodiphenyl ethane is mainly achieved by the reaction of bromine and diphenyl ethane. The specific reaction equation is as follows:

C6H5CH = CHC6H5 10Br2 → C6H4Br5CH = CHC6H4Br5

The reaction is a free radical substitution reaction, in which bromine and diphenyl ethane generate free radicals under the action of an initiator, which in turn initiates the free radical substitution reaction between bromine and diphenyl ethane.

2. Process
The manufacturing process of
decabromodiphenyl ethane mainly includes the following steps:

1. Feeding: A certain proportion of diphenyl ethane and bromine are added to the reactor.
2. Initiating reaction: adding initiator and raising temperature to initiate radical substitution reaction.
3. Reaction control: Control the reaction temperature, pressure and the dropping rate of bromine to ensure a smooth reaction.
4. Post-treatment: After the reaction, post-treatment operations such as cooling, separation, washing and drying are carried out to obtain decabromodiphenyl ethane product.

3. equipment selection

In the manufacturing process of decabromodiphenyl ethane, it is necessary to select appropriate reaction equipment and post-treatment equipment. The following are some of the main equipment options:

1. reaction kettle: choose corrosion resistance, high temperature resistance, high pressure reaction kettle to meet the reaction conditions.
2. Stirring device: Select an efficient stirring device to ensure that the reaction materials are evenly mixed.
3. Dropping device: Select a precise dropping device to control the dropping speed of bromine.
4. separation equipment: choose centrifuge, filter and other separation equipment, in order to achieve the separation of products and impurities.
5. Washing and drying equipment: Select washing tower, dryer and other equipment to complete the washing and drying operation of the product.

4. precautions

In the manufacturing process of decabromodiphenyl ethane, the following matters need to be paid attention to:

1. Strictly control the reaction temperature and pressure to prevent equipment overpressure or high temperature from causing safety accidents.
2. Ensure good ventilation during the reaction to avoid poisoning accidents caused by high bromine vapor concentration.
3. Operators should be professionally trained and familiar with the manufacturing process and operating procedures to ensure the safe and smooth production process.
4. Waste water, waste gas and other wastes need to be properly treated to meet environmental protection requirements.

In short, the manufacture of decabromodiphenyl ethane requires strict compliance with relevant regulations and safe operating procedures to ensure a safe, environmentally friendly and efficient production process. Through reasonable process design and equipment selection, high-quality decabromodiphenyl ethane products can be produced, providing important raw material guarantee for the chemical production field.

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