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