Krypton and xenon recovery method

F - Mech Eng,Light,Heat,Weapons – 25 – J

Patent

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F25J 3/04 (2006.01)

Patent

CA 2733510

A method of separating air in which a superheated air stream is introduced into a mass transfer contacting zone associated with a higher pressure column of an air separation unit. Krypton and xenon is washed from a superheated air stream introduced into the mass transfer contacting zone, thereby to form a krypton and xenon-rich liquid. The krypton and xenon- rich liquid is stripped within a stripping column to produce a krypton-xenon-rich bottoms liquid. A krypton-xenon- rich stream composed of the krypton-xenon-rich bottoms liquid from the stripping column is produced for purposes of further refinement.

Linvention concerne un procédé de séparation dair selon lequel un courant dair surchauffé est introduit dans une zone en contact avec un transfert de masse associée avec une colonne à pression supérieure dune unité de séparation dair. Du krypton et du xénon sont lavés à partir dun courant dair surchauffé introduit dans la zone en contact avec un transfert de masse, formant ainsi un liquide riche en krypton et en xénon. Le liquide riche en krypton et en xénon est extrait dans une colonne dextraction pour produire un liquide de fond riche en krypton et en xénon. Un courant riche en krypton et en xénon composé du liquide de fond riche en krypton et en xénon issu de la colonne dextraction est produit aux fins dun raffinage supplémentaire.

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