The catalyst, {TAIL ~ water} and {HEAD ~ unreacted methanol} can be recovered and recycled back to the reaction zones 
The catalyst , { TAIL ~ water } and { HEAD ~ unreacted methanol } can be recovered and recycled back to the reaction zones
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH