Hexafluoropropene (HFP) is an important fluorine-containing chemical widely used in refrigerants, solvents, polymer materials and other fields. This article will introduce the manufacturing method of HFP, focusing on its production process, raw material requirements and operation points.
I. Properties and Uses of Hexafluoropropene
Hexafluoropropene is a colorless, odorless, non-flammable gas with high chemical and thermal stability. It liquefies easily at low temperature and is easy to store and transport. The main use of hexafluoropropene is as refrigerant, solvent and monomer of polymer materials.
II. Manufacturing method of hexafluoropropene
1. Electrolysis method
The electrolysis method takes anhydrous hydrogen fluoride as raw material, generates fluorine gas and hydrogen gas through electrolysis, and then reacts fluorine gas with propylene to produce hexafluoropropene. The specific steps are as follows:
(1) Pass anhydrous hydrogen fluoride into the electrolyzer to generate fluorine gas at the anode and hydrogen gas at the cathode.
(2) The fluorine gas is mixed with propylene, and a gas-phase reaction is carried out under the action of a catalyst to produce hexafluoropropylene.
Electrolysis method for the preparation of hexafluoropropylene 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 is to mix tetrafluoroethylene and trifluoroethylene chloride in a certain proportion, and carry out pyrolysis reaction under high temperature to produce hexafluoropropene and hydrogen chloride. The specific steps are as follows:
(1) Mix tetrafluoroethylene and trifluoroethylene chloride in a certain proportion and pass them into the pyrolysis furnace.
(2) Carry out pyrolysis reaction at high temperature to produce hexafluoropropene and hydrogen chloride.
(3) Pure hexafluoropropylene is obtained through condensation and separation processes.
The pyrolysis method has the advantages of simple process and low cost, but the purity of the product is low and needs further refining.
Third, raw material requirements and operation points
1. Raw material requirements
The raw material for the preparation of hexafluoropropene should have high purity to ensure the quality and yield of the product. The purity of anhydrous hydrogen fluoride should be not less than 99.9%, and the purity of propylene should be not less than 99.5%. The purity of tetrafluoroethylene and trifluoroethylene chloride should also have high requirements.
2. Operation points
In the process of preparing hexafluoropropylene, the following operation points need to be noted:
(1) Strictly control the reaction temperature and pressure to ensure that the reaction is carried out under the optimal conditions.
(2) Regularly check and maintain the equipment to ensure its normal operation.
(3) Strengthen the safety management in the production process to prevent accidents such as leakage and fire.
Four, Conclusion
Hexafluoropropylene is an important fluorine-containing chemical, which is widely used in various fields. Its manufacturing methods are mainly electrolysis and pyrolysis, each with its own advantages and disadvantages. In the preparation process, the purity of raw materials and operating conditions need to be strictly controlled to ensure the quality and yield of the product. At the same time, safety management and equipment maintenance are strengthened to ensure the smooth progress of the production process.
