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