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