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