An outlet 28 is provided on the products header to withdraw {TAIL ~ reactants} which emerge from the tube bundle for {HEAD ~ subsequent processing} 
An outlet 28 is provided on the products header to withdraw { TAIL ~ reactants } which emerge from the tube bundle for { HEAD ~ subsequent processing }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD