Reducing {HEAD ~ temperature differences} within the regenerator of {TAIL ~ an oxygenate} to olefin process 
Reducing { HEAD ~ temperature differences } within the regenerator of { TAIL ~ an oxygenate } to olefin process
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH