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