Verfahrenskonzept zur Abtrennung des radioaktiven Kryptons aus demAuflöserabgas mittels Adsorption

A method for separating radioactive krypton from the off-gas of a dissolver is being described, which is based on the principle of adsorption and desorption on adsorbents. The basis for the development of the process concept are laboratory experiments corroborating the feasibility of the individual process steps. Moreover, the different adsorption processes for krypton separation described in the past are taken into account. The entire process essentially consists of three stages which are coupled together: - Retention of NO$_{x}$ residues from the off-gas on molecular sieve and recycling the NO$_{x}$ with part of the waste gas into the dissolver - Deposition of xenon on activated charcoal with simultaneous concentration of krypton in the off-gas - Deposition of krypton from the remaining offgas by means of preparative gas chromatography with coupled filling of pure crypton into storage cylinders containing activated charcoal