{HEAD ~ An object} of this invention is to provide {TAIL ~ a thermal cracking process} that is relatively highly energy efficient compared to known processes and which also provides relatively high selectivities for acetylene and ethylene 
is to provide
{ HEAD ~ An object } of this invention is to provide { TAIL ~ a thermal cracking process } that is relatively highly energy efficient compared to known processes and which also provides relatively high selectivities for acetylene and ethylene
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH