The process 1, further comprising separating and recycling {HEAD ~ CO2} contained in the resultant cracked gas for {TAIL ~ thermal cracking} 
The process 1 , further comprising separating and recycling { HEAD ~ CO2 } contained in the resultant cracked gas for { TAIL ~ thermal cracking }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL