The remaining liquid product is recovered and {HEAD ~ the formate} is separated by {TAIL ~ distillation} 
is separated by
The remaining liquid product is recovered and { HEAD ~ the formate } is separated by { TAIL ~ distillation }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL