{HEAD ~ The process} 10 wherein {TAIL ~ the propylene}, oxygen, and hydrogen are fed at or near the bottom of the reactor 
wherein
{ HEAD ~ The process } 10 wherein { TAIL ~ the propylene } , oxygen , and hydrogen are fed at or near the bottom of the reactor
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH