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