A reactor enclosed in a pressure vessel in {HEAD ~ a manner} that {TAIL ~ the walls} of the pressure vessel are thermally insulated and chemically isolated from the harsh environment of the reaction zone in the reactor 
A reactor enclosed in a pressure vessel in { HEAD ~ a manner } that { TAIL ~ the walls } of the pressure vessel are thermally insulated and chemically isolated from the harsh environment of the reaction zone in the reactor
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH