Liquid-phase oxidation of hexafluoropropylene
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The kinetics of the oxidation of CR3F6 was studied at 100–140° and 50 atm in reactors of stainless steel and Teflon. At the early stages of oxidation of C3F6, the only products are hexafluoropropylene oxide, carbonyl fluoride, and perfluoroacetylfluoride.
The reaction rates and compositions of the oxidation products of C3F6 in a Teflon reactor and in a stainless-steel reactor were compared. The yield of C3F6O in a Teflon reactor is twice as high as in a steel reactor, while the ratio CF3CFO/C3F6O drops to 0.5 in comparison with 1.1 for a steel reactor.
The influence of solvents on the rate of oxidation of C3F6 and the kinetics of formation of C3F3O were studied. The maximum reaction rate is reached when the process is conducted in a mixture of perfluorinated ethers (D-104).
A mechanism of the oxidation of hexafluoropropylene, according to which CF3CFO and CF2O are formed in one event simultaneously with the formation of hexafluoropropylene oxide was considered.
KeywordsOxidation Ether Stainless Steel Fluoride Carbonyl
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