METHOD FOR PRODUCTION OF POLYFLUORINATED ETHERS Russian patent published in 2003 - IPC

FIELD: industrial organic synthesis. SUBSTANCE: polyfluorinated ethers of general formula ROOCF₂CF₂H, in which R is methyl or radical HCF₂CF₂CH₂-, are prepared via catalytic reaction of an aliphatic alcohol with tetrafluoroethylene, which is carried out at 50-110 C and pressure 9-16 kg/sq.cm in presence of water in amount 30-40% of the weight of catalyst, in particular sodium hydroxide employed in amounts 1.2- 2.0% of the weight of alcohol. When tetrafluoroethyl tetrafluoropropyl ether HCF₂CF₂OCH₂CF₂CF₂H is to be obtained, process is carried out in presence of 2 to 10 wt % methanol. EFFECT: increased yield of desired product and reduced consumption of catalyst.