The impact of the invention is to reduce the heat requirement of distillation in exchange for an amount of work which is usually small because {HEAD ~ the temperature difference} between {TAIL ~ heat sources} and sinks is minimized 
between
The impact of the invention is to reduce the heat requirement of distillation in exchange for an amount of work which is usually small because { HEAD ~ the temperature difference } between { TAIL ~ heat sources } and sinks is minimized
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH