Extractive distillation of tetrafluoroethylene with an oxygenated hydrocarbon

Claim 1

A PROCESS FOR SEPARATING TETRAFLUOROETHYLENE FROM FLUOROCARBONS CONTAINING FROM 1 TO 2 CARBON ATOMS AND, IN ADDITION TO FLUORINE, ELEMENTS SELECTED FROM THE CLASS CONSISTING OF HYDROGEN AND HALOGEN, HAVING ATOMIC NUMBERS FROM 17 TO 53 INCLUSIVE IN ADMIXTURE WITH THE TETRAFLUOROETHYLENE, THE STEPS OF DISTILLING THE MIXTURE, BY EXTRACTIVE DISTILLATION IN THE PRESENCE OF AN OXYGENATED HYDROCARBON, LIQUID AT DISTILLATION CONDITIONS AND SELLECTED FROM THE CLASS CONSISTING OF ALCOHOLS, ETHERS, KETONES AND ESTERS, SAID OXYGENATED HYDROCARBONS HAVING THE GENERAL FORMULAS R1OH, R2OR3, R4COR5 AND R6COOR7, WHERE R1 TO R7 ARE RADICALS SELECTED FROM THE CLASS CONSISTING OF SATURATED ALIPHATIC AND AROMATIC HYDROCARBON RADICALS, AND REMOVING THE TERTRAFLUOROETHYLENE AS AN OVERHEAD FROM THE DISTILLATION ZONE.