A surprising finding underlying this aspect of the invention is that it is possible, using for instance a nitrogen purge, to displace essentially all of the oxygen from the bed in {HEAD ~ a co current purge step}, without desorbing any of {TAIL ~ the adsorbed inert gas} 
A surprising finding underlying this aspect of the invention is that it is possible , using for instance a nitrogen purge , to displace essentially all of the oxygen from the bed in { HEAD ~ a co current purge step } , without desorbing any of { TAIL ~ the adsorbed inert gas }
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