After removal of water, {HEAD ~ the resulting saturated gas mixture} is introduced into {TAIL ~ a four bed hydrogen PSA unit} to produce high purity hydrogen, i.e. at least 99.999 percent pure 
is introduced into
After removal of water , { HEAD ~ the resulting saturated gas mixture } is introduced into { TAIL ~ a four bed hydrogen PSA unit } to produce high purity hydrogen , i.e. at least 99.999 percent pure
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH