Process and apparatus for the recovery of krypton and/or xenon

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Krypton and/or xenon is separated crudely from an oxygen product 800 comprising oxygen and at least one rare gas selected from the group consisting of krypton and xenon in a dephlegmation process in a rare gas recovery system comprising at least one heat exchanger 80. The process is characterised in that the pressure of the oxygen product 800 is increased before being fed to the rare gas recovery system, and in that at least about 50 mol % of said oxygen product 800 is fed to the rare gas recovery system in the gaseous phase. One advantage of a preferred embodiment of the present invention is that it can easily be retrofitted to existing pumped LOX cycle ASUs.