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[Chemical Knowledge]：Production and manufacturing method and process flow of coal to aromatics

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The manufacturing method
of coal-to-aromatics
1. Introduction

With the continuous development of science and technology, coal-to-aromatics technology has become an important manufacturing method in the field of raw materials for chemical production. As an important organic chemical raw material, aromatic hydrocarbons are widely used in plastics, fibers, rubber, coatings and other fields. The emergence of coal-to-aromatics technology not only improves the production efficiency of aromatics, but also reduces the production cost, which provides strong support for the development of chemical industry. This paper will introduce the manufacturing method of coal aromatics in detail, including raw material treatment, reaction process, product separation and purification.

2. raw material processing

coal to aromatics raw material is mainly coal, through a specific treatment process, the coal is converted into a gas suitable for aromatics synthesis. First, the coal needs to be gasified to convert it into synthesis gas (mainly CO and H2). In the gasification process, it is necessary to control the appropriate temperature, pressure and flow rate of the gasification agent to ensure the quality and yield of the synthesis gas.

3. reaction process

1. Fischer-Tropsch synthesis

synthesis gas after compression, purification treatment, into the Fischer-Tropsch synthesis reactor. At appropriate temperature, pressure and catalyst, synthesis gas is converted into a mixture of hydrocarbons, including aromatics, alkanes, etc. In the process of Fischer-Tropsch synthesis, it is necessary to select a suitable catalyst and strictly control the reaction conditions to improve the selectivity of aromatics.

2. Aromatics extraction

The Fischer-Tropsch synthesis product is cooled and separated to obtain a fraction rich in aromatics. Further through distillation, extraction and other processes, the aromatic hydrocarbons are extracted from the mixture. In this process, it is necessary to optimize the operating parameters to improve the yield of aromatics.
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4. product separation and purification

, the extracted aromatic hydrocarbon mixture still contains a certain amount of impurities, which need to be further separated and purified. Commonly used separation methods are distillation, adsorption, extraction and so on. By these methods, aromatic hydrocarbons can be purified to the desired purity. In the process of separation and purification, it is necessary to select appropriate methods and operating conditions for different impurities to ensure product quality and yield.

5. process optimization

In order to improve the production efficiency and economy of coal to aromatics, it is necessary to continuously optimize the process. Including improving raw material treatment process, improving catalyst activity, optimizing reaction conditions, strengthening equipment maintenance and so on. At the same time, it is also necessary to pay attention to the requirements of environmental protection and safety production to ensure the sustainability and stability of the process.

6. conclusion

coal aromatics technology as an important chemical production raw material manufacturing method, with high production efficiency and economic benefits. Through the detailed introduction of raw material treatment, reaction process, product separation and purification, we can understand the manufacturing process and its key technology of coal-to-aromatics. Continuously optimizing the process and improving the technical level will provide strong support for the sustainable development of the chemical industry.

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