{HEAD ~ Devices} are provided for introducing {TAIL ~ separately reactants} to within the tubes of the reactor and coolant to the channels defined between adjacent tubes of the bundle 
{ HEAD ~ Devices } are provided for introducing { TAIL ~ separately reactants } to within the tubes of the reactor and coolant to the channels defined between adjacent tubes of the bundle
HEAD HEAD HEAD HEAD HEAD REL REL REL REL 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