METHOD AND APPARATUS FOR RECOVERING KRYPTON AND/OR XENON

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PROBLEM TO BE SOLVED : To provide a method and an apparatus for recovering krypton and/or xenon. SOLUTION : Krypton and/or xenon is separated crudely from a mixture including oxygen and at least one rare gas selected from a group composed of krypton and xenon in a method including steps for feeding the mixture or a mixture derived therefrom to a rare gas recovery system, and separating the mixture material in the rare gas recovery system into rare gas-lean gaseous oxygen (GOX) and rare gas-enriched product. In the method, at least about 50 mol% of the mixture is fed to the rare gas recovery system in a gaseous phase provided that, when the mixture material is separated by selective adsorption, the concentration of xenon in the mixture material is no greater than 50 times the concentration of xenon in air. One advantage of a preferred embodiment is that it can easily be retrofitted to an existing pumped-liquid oxygen cycle air separator. COPYRIGHT : (C)2010, JPO&INPIT