Method for separating condensive gases from gases containing radioactive rare gases

Object: To effectively adsorb and remove condensive gases within radioactive waste gases. Structure: Processed gases are heated by a preheater and fed to an adsorbing tower through a hydrocarbon oxide tower, a hydrogen reduction tower and pipe lines. The pipe line contains condensive gases including CO2, NH3 and H2O and Kr, with N2 as a main constituent. The adsorbing tower has a molecular sieve which selectively adsorbs the condensive gases. Outlet gases are fed to a distilling tower. Vent gases are changed over prior to flow-out of the condensive gases into the outlet gases and vented into the adsorbing tower, and purge gases are vented into the adsorbing tower to remove Kr and the removed gases are mixed into the pipe line through a circulating line. After removal of Kr, the purge gases from the outlet of the adsorbing tower are heated by a heater to remove the condensive gases and the removed gases are discharged out of the discharging line. (Kamimura, M.)