An inlet 26 is provided for {TAIL ~ the reactant header} which introduces {HEAD ~ reactant thereto} which in turn flows within the tubes of the tube bundle 12 
An inlet 26 is provided for { TAIL ~ the reactant header } which introduces { HEAD ~ reactant thereto } which in turn flows within the tubes of the tube bundle 12
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH