In processing {HEAD ~ natural gas} for {TAIL ~ the removal} of nitrogen, hydrocarbon recoveries of greater than 99 mol % are achieved 
for
In processing { HEAD ~ natural gas } for { TAIL ~ the removal } of nitrogen , hydrocarbon recoveries of greater than 99 mol % are achieved
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH