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[Chemical Knowledge]：Production and manufacturing method and process flow of o-dichlorobenzene

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The manufacturing method
of o-dichlorobenzene
o-dichlorobenzene (o-Dichlorobenzene, referred to as ODCB) is an important organic chemical raw material, widely used in pesticides, pharmaceuticals, dyes, spices and other fields. This article will introduce the manufacturing method of o-dichlorobenzene in detail, including raw material preparation, reaction process, post-treatment and precautions.

1. raw material preparation

The main raw materials for the manufacture of o-dichlorobenzene are benzene and chlorine. In order to ensure the smooth progress of the reaction, it is necessary to select benzene and chlorine with high purity. At the same time, it is necessary to prepare a certain catalyst, such as aluminum trichloride or ferric chloride, to promote the reaction.

2. reaction process

The manufacturing process of o-dichlorobenzene mainly includes the following steps:

1. Add benzene and catalyst into the reactor and stir evenly.
2. Into the chlorine gas, control the reaction temperature in the appropriate range, generally 50-60 DEG C.
3. Stirring is required during the reaction to ensure full contact of the reaction materials.
4. o-dichlorobenzene product was obtained by controlling the feed rate and reaction time of chlorine.

3. post-treatment
After the
reaction, the product needs to be post-treated to obtain o-dichlorobenzene with higher purity. The specific steps are as follows:

1. the reaction solution is cooled to room temperature, and an alkaline absorbent is added to neutralize the residual acidic catalyst.
2. Separate the upper organic phase from the lower aqueous phase.
3. Distillation of the organic phase to collect a fraction of o-dichlorobenzene.
4. Refine the collected o-dichlorobenzene, such as recrystallization or adsorption treatment, to improve the purity of the product.
Precautions for
4.

In the manufacturing process of o-dichlorobenzene, the following matters need to be paid attention to:

1. Strictly control the purity of raw materials to avoid the influence of impurities on the reaction.
2. Ensure that the reaction temperature is within a suitable range to avoid the effect of too high or too low temperature on the reaction.
3. Chlorine gas is a toxic gas and needs to be operated in a well-ventilated environment with corresponding safety protection measures.
4. In the post-treatment process, the appropriate absorbent and refining method should be selected to ensure the purity of the product.

In short, the manufacturing process of o-dichlorobenzene needs to strictly control the conditions of each link to ensure the smooth progress of the reaction and the improvement of product purity. At the same time, pay attention to safety and comply with relevant laws and regulations during operation.

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