For recovering acetylene from hydrocarbons, {TAIL ~ the hydrocarbons} are thermally cracked in the presence of CO2 as {HEAD ~ a diluent gas} 
For recovering acetylene from hydrocarbons , { TAIL ~ the hydrocarbons } are thermally cracked in the presence of CO2 as { HEAD ~ a diluent gas }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD