PROCESS FOR THE SEPARATION OF TETRAFLUOROETHYLENE FROM GAS MIXTURES CONTAINING IN ADDITION TO TETRAFLUOROETHYLENE PARTICULARLY NITROGEN OR CARBON MONOXIDE

1. A process for separating tetrafluoroethylene from a gaseous mixture obtained in the tetrafluoroethylene liquefaction step of the pyrolysis products of difluoromonochloromethane and from scavenging gases of tetrafluoroethylene manufacture and polymerization processes or by mixing such gases and containing, in addition to tetrafluoroethylene, nitrogen, carbon monoxide or mixtures thereof and optionally minor amounts of difluorochloromethane and its non-liquefiable pyrolysis products, characterised by contacting said gaseous mixture with a liquid absorption medium being present in an amount of from 5 to 10 parts by weight per part by weight of tetrafluoroethylene in said gaseous mixture and having a temperature of from -30 degrees C to -100 degrees C and comprising a) difluoromonochloromethane, tetrafluoromonochloroethane, hexafluoromonochloropropane, and mixtures thereof, and b) a fraction obtained in the fractional distillation process of the pyrolysis products of difluoromonochloromethane after liquefying and separating the liquefied tetrafluoroethylene, said fraction containing at least 40% by weight of group a) components, whereby absorbing the tetrafluoroethylene and liberating the remaining non-liquefiable components, and then recycling the absorption medium charged with tetrafluoroethylene into the liquefied portion of said pyrolysis products.