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