Without these extractive distillation agents, no improvement above {HEAD ~ the azeotrope composition} will occur in {TAIL ~ a rectification column} 
Without these extractive distillation agents , no improvement above { HEAD ~ the azeotrope composition } will occur in { TAIL ~ a rectification column }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL