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