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