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