Processes for decontaminating nuclear process off-gas streams

Details Processes for decontaminating nuclear process off-gas streams Processes for decontaminating nuclear process off-gas streams

1978-12-04

1981-06-02

Thomas, Earl C.

Refrigeration

Processes

Circulating external gas

423210, 423219, 423239, 423262, 423351, 176 37, F25J 308

Patent

active

042709385

ABSTRACT:
In a process for decontaminating a nuclear process off-gas stream, oxygen and oxides of nitrogen are removed by catalytic reaction with hydrogen. The feed gas stream is then passed serially through a drier, a carbon dioxide adsorber and a xenon adsorber to sequentially remove water, CO.sub.2 and xenon therefrom. The feed gas exiting the xenon adsorber is passed to a krypton recovery process wherein krypton is concentrated to a first level in a primary distillation column, partially evaporated to increase concentration thereof and is brought to a concentration of approximately 90 mol % or greater in a second distillation column thereby enabling efficient storage of a radioactive krypton product. The xenon gas removed from the main feed stream in the xenon adsorber is passed to a freezeout heat exchange device to concentrate xenon to approximately 99% or greater, balance krypton. The minor fraction of krypton may then be removed from such xenon-rich product in a distillation tower with the xenon product being stored in gas cylinders or the like.

REFERENCES:
patent: 3501923 (1970-03-01), Lehmer
patent: 3609983 (1968-05-01), Lofredo et al.
patent: 3748864 (1973-07-01), Lofredo et al.
patent: 3944646 (1976-03-01), Martin
patent: 4012490 (1977-03-01), Lofredo
patent: 4045191 (1977-08-01), Martin
patent: 4080429 (1978-03-01), Koeppe et al.

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