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[Chemical Knowledge]：Production process and preparation method of styrene

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Styrene is an important organic chemical, which is widely used in industrial production. It is an important raw material for the synthesis of various plastics, synthetic rubber, synthetic fibers and synthetic adhesives. At the same time, styrene is also one of the raw materials for synthetic fragrances, dyes and coatings. In this article, we will focus on the production process and preparation method of styrene.

of styrene production process:

1. anthracene method: this method is the use of hydrocarbons anthracene as raw materials, through the catalyst temperature, so that the decomposition of anthracene molecules, the formation of styrene and other compounds. The method is characterized by a large amount of styrene production, but the process is complex and the equipment requirements are high.

2. Ethylbenzene cracking method: This method is based on ethylbenzene as raw material, at high temperature decomposition of styrene, benzene and ethylene and other compounds. This method is suitable for small and medium-sized production, but it requires the use of high temperature and high pressure equipment and large investment.

of styrene preparation method:

1. olefin hydrogenation method: this method is the use of olefin and hydrogen under the action of a catalyst to generate styrene. The advantages of this method are mild reaction conditions, simple and low cost.

2. aromatic alkylation method: this method is the use of aromatic hydrocarbons in the role of the catalyst, the alkyl group is connected to the aromatic ring, the generation of styrene. This method requires a high choice of catalyst, and the process will generate a large amount of waste.

In the above several preparation methods, olefin hydrogenation method is a more common method. Next, we will introduce the specific steps of preparing styrene by olefin hydrogenation method:

After mixing olefin and hydrogen, it is treated by washing, drying, etc., and is to be used. Then, under the action of the catalyst, the reaction produces styrene and a small amount of by-products. After completion of the reaction, a styrene product is obtained by distillation, purification and the like. In the production process of

, attention should be paid to the control of reaction conditions, such as temperature, pressure, catalyst type and dosage, etc., in order to achieve the best reaction effect. In addition, pay attention to the maintenance of equipment to prevent accidents.

summary:

styrene is an important organic chemical. Its production process and preparation method are important, but more important is to improve product quality, save energy, protect the environment, and promote sustainable development in production practice.