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