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