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