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[Chemical Knowledge]：Production method and process flow of polymerization grade propylene

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The manufacturing method
of polymer grade propylene
1. Introduction

propylene is an important chemical raw material, which is widely used in the production of various chemicals, such as polymers, alcohols, ethers, aldehydes, ketones, etc. Among them, polymer grade propylene is the main raw material for the production of polypropylene and other polymers, and its purity and quality have an important impact on the performance of the polymer. Therefore, it is of great significance to study the manufacturing method of polymer grade propylene for improving the quality and yield of polypropylene and other polymers.

2. polymerization grade propylene manufacturing method

1. Steam cracking method

steam cracking method is the main method of producing polymerization grade propylene. The method uses naphtha, light diesel oil, liquefied petroleum gas, etc. as raw materials, under high temperature and high pressure conditions, mixed with water vapor, enters the cracking furnace for cracking reaction, and generates low-carbon olefins such as propylene and ethylene. Cracking gas after cooling, separation, purification and other processes, to obtain polymerization grade propylene. The advantages of

steam cracking are a wide range of raw materials, mature production processes and high product purity. However, the energy consumption of this method is high, and a large amount of by-products and waste will be produced, which will cause certain pollution to the environment.

2. Catalytic cracking method

catalytic cracking method is under the action of the catalyst, the raw oil cracking reaction, the production of propylene and other low-carbon olefins. Compared with steam cracking, catalytic cracking has lower energy consumption and less waste emissions, but the activity and selectivity of the catalyst have a greater impact on product quality.

3. olefin disproportionation method

olefin disproportionation method is to low-carbon olefin (such as ethylene, propylene) under the action of catalyst, disproportionation reaction, high-carbon olefin (such as butene, pentene) and low-carbon olefin (such as ethylene, propylene) mixture. Through separation and purification, polymerization grade propylene can be obtained. The advantage of

olefin disproportionation method is that low-carbon olefins can be used as raw materials to produce high value-added polymer products, but the activity and selectivity of the catalyst also have a greater impact on product quality.

3. polymer-grade propylene manufacturing process optimization

In order to improve the quality and yield of polymer-grade propylene, the manufacturing process needs to be optimized. The following are some possible optimization measures:

1. Improve the activity and selectivity of the catalyst to improve the yield and purity of propylene;
2. Optimize the cracking reaction conditions to improve the reaction efficiency and product quality;
3. Strengthen the control and management of the production process to reduce fluctuations and errors in the production process;
4. Adopt advanced separation and purification technology to improve the purity and yield of the product.

4. conclusion

polymerization grade propylene is an important raw material for the production of polypropylene and other polymers, and its manufacturing methods mainly include steam cracking, catalytic cracking and olefin disproportionation. In order to improve product quality and yield, it is necessary to optimize the manufacturing process, including improving the activity and selectivity of the catalyst, optimizing the cracking reaction conditions, strengthening the control and management of the production process, and adopting advanced separation and purification technology. Through the implementation of these measures, the quality and output of polymer-grade propylene can be further improved, and strong support can be provided for the development of the polymer industry.

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