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