At this point, gas flow is initiated and the reactant material is introduced into {TAIL ~ the inlet} of {HEAD ~ the reactor} as shown by arrow 154 
At this point , gas flow is initiated and the reactant material is introduced into { TAIL ~ the inlet } of { HEAD ~ the reactor } as shown by arrow 154
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH