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