EP 0032949 A4 19820108 - METHOD FOR TREATING A NUCLEAR PROCESS OFF-GAS STREAM.
Title (en)
METHOD FOR TREATING A NUCLEAR PROCESS OFF-GAS STREAM.
Title (de)
VERFAHREN ZUM BEHANDELN EINES WÄHREND EINES KERNVERFAHRENS ENTSTANDENEN ABGASSTROMES.
Title (fr)
METHODE POUR LE TRAITEMENT DE COURANTS GAZEUX EMIS PENDANT UN PROCEDE NUCLEAIRE.
Publication
Application
Priority
US 6397079 A 19790806
Abstract (en)
[origin: WO8100413A1] Method for selectively removing and recovering the noble gas and other gaseous components typically emitted during nuclear process operations. The method is adaptable and useful for treating dissolver off-gas effluents released during reprocessing of spent nuclear fuels whereby to permit radioactive contaminant recovery prior to releasing the remaining off-gases to the atmosphere. Briefly, the method sequentially comprises treating the off-gas stream to preliminarily remove NOx, hydrogen and carbon-containing organic compounds, and semivolatile fission product metal oxide components therefrom (11 and 16); adsorbing iodine components on silver-exchanged mordenite (17); removing water vapor carried by said stream by means of a molecular sieve (31); selectively removing the carbon dioxide components of said off gas stream by means of a molecular sieve (51); selectively removing xenon in gas phase by passing said stream through a molecular sieve (71) comprising silver-exchanged mordenite; selectively separating krypton from oxygen by means of a molecular sieve (91) comprising silver-exchanged mordenite; selectively separating krypton from the bulk nitrogen stream using a molecular sieve (111) comprising silver-exchanged mordenite cooled to about -140 to -160 C; concentrating the desorbed krypton upon a molecular sieve (131) comprising silver-exchange mordenite cooled to about -140 to -160 C; and further cryogenically concentrating, and then recovering for storage, the desorbed krypton (137).
IPC 1-7
IPC 8 full level
C01B 23/00 (2006.01); G21F 9/00 (2006.01); G21F 9/02 (2006.01)
CPC (source: EP)
G21F 9/02 (2013.01)
Citation (search report)
- US 4093429 A 19780606 - SIEGLER MANFRED, et al
- US 4045191 A 19770830 - MARTIN JAY ROBERT
- FR 2344933 A1 19771014 - LINDE AG [DE]
- GB 1525686 A 19780920 - LINDE AG
- US 4012490 A 19770315 - LOFREDO ANTONY
Designated contracting state (EPC)
FR
DOCDB simple family (publication)
WO 8100413 A1 19810219; EP 0032949 A1 19810805; EP 0032949 A4 19820108; GB 2070454 A 19810909; GB 2070454 B 19831207; JP S56500976 A 19810716
DOCDB simple family (application)
US 8000992 W 19800806; EP 80901636 A 19810224; GB 8110204 A 19800806; JP 50197180 A 19800806