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[Chemical Knowledge]：Production and manufacturing method and process flow of hexafluoropropylene

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Hexafluoropropylene (HFP) is an important fluorine-containing chemical, which is widely used in refrigerant, solvent, polymer materials and other fields. This paper will introduce the manufacturing method of hexafluoropropylene, focusing on its production process, raw material requirements and operating points.

1. the properties and uses of hexafluoropropylene

hexafluoropropylene is a colorless, odorless, non-flammable gas with high chemical and thermal stability. It liquefies easily at low temperatures and is easy to store and transport. The main use of hexafluoropropylene is as a refrigerant, solvent and monomer of polymer materials.

2. hexafluoropropylene manufacturing method

1. Electrolysis
electrolysis method is anhydrous hydrogen fluoride as raw material, through the electrolysis of fluorine gas and hydrogen, and then the fluorine gas and propylene reaction of hexafluoropropylene. The specific steps are as follows:

(1) Anhydrous hydrogen fluoride is introduced into an electrolyzer to generate fluorine gas on the anode and hydrogen gas on the cathode.

(2) Fluorine gas and propylene are mixed and reacted in a gas phase with a catalyst to produce hexafluoropropylene.
The preparation of hexafluoropropylene by
electrolysis has the advantages of high product purity and high yield, but the energy consumption is large and the equipment corrosion is serious.

2. Pyrolysis
Pyrolysis method is to mix tetrafluoroethylene and chlorotrifluoroethylene according to a certain proportion, and conduct pyrolysis reaction at high temperature to generate hexafluoropropylene and hydrogen chloride. The specific steps are as follows:

(1) Tetrafluoroethylene and chlorotrifluoroethylene are mixed according to a certain ratio and introduced into a pyrolysis furnace. The

(2) is pyrolyzed at a high temperature to produce hexafluoropropylene and hydrogen chloride.

(3) Pure hexafluoropropylene is obtained by processes such as condensation and separation.

pyrolysis has the advantages of simple process and low cost, but the product purity is low and needs further refinement.

3. raw material requirements and operating points

1. Raw material requirements
raw materials for the preparation of hexafluoropropylene should have a high purity to ensure product quality and yield. The purity of anhydrous hydrogen fluoride shall not be less than 99.9% and the purity of propylene shall not be less than 99.5%. The purity of tetrafluoroethylene and chlorotrifluoroethylene should also have higher requirements.

2. Operating points
In the process of preparing hexafluoropropylene, the following operating points need to be paid attention to:

(1) Strictly control the reaction temperature and pressure to ensure that the reaction is carried out under the best conditions.

(2) Check and maintain the equipment regularly to ensure the normal operation of the equipment.

(3) Strengthen the safety management in the production process to prevent accidents such as leakage and fire.

4. Conclusion
Hexafluoropropylene is an important fluorine-containing chemical, widely used in various fields. Its manufacturing method mainly has two kinds of electrolysis and pyrolysis, each has its own advantages and disadvantages. In the preparation process, it is necessary to strictly control the purity of raw materials and operating conditions to ensure the quality and yield of the product. At the same time, strengthen safety management and equipment maintenance to ensure the smooth progress of the production process.

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