1. IN THE METHOD OF TREATING A LIQUID FEED COMPRISING A MORE VOLATILE AND A LESS VOLATILE FRACTION TO SEPARATE SAID FRACTIONS THE STEPS COMPRISING (1) MOVING SAID LIQUID FEED VERTICALLY THROUGH A SUBSTANTIALLY VERTICAL EVAPORATION CHAMBER HAVING THEREWITHIN A CONDITION OF SUBSTANTIALLY PROGRESSIVELY INCREASING TEMPERATURE IN THE DIRECTION OF SAID LIQUID FEED MOVEMENT AND MOVING CONCURRENTLY THEREWITH AND IN CONTACT THEREWITH A CARRIER GAS THEREBY TO PROGRESSIVELY HEAT SAID LIQUID AND SAID GAS MEDIA TO CAUSE EVAPORATION OF THE MORE VOLATILE FRACTION FROM SAID LIQUID AND ENRICHMENT OF SAID CARRIER GAS IN VAPOR OF SAID MORE VOLATILE FRACTION; (2) HEATING THE MOST ADVANCED PORTIONS OF SAID EVAPORATION CHAMBER AND THE FLUID MEDIA THEREWITHIN TO THE HIGHEST TEMPERATURE WITHIN SAID INCREASING TEMPERATURE CONDITION EXCLUSIVELY WITH EXTERNALLY DERIVED HEAT ENERGY; (3) MOVING THE VAPOR ENRICHED GAS FROM THE EXIT OF SAID EVAPORATION CHAMBER THROUGH A CONDENNSATION CHAMBER COUNTERCURRENTLY WITH RESPECT TO THE FLOW IN THE EVAPORATION CHAMBER AND IN HEAT TRANSFER RELATIONSHIP WITH PORTIONS OF SAID EVAPORATION CHAMBER PRECEDING SAID MOST ADVANCED PORTIONS TO PROGRESSIVELY COOL SAID VAPOR ENRICHED CARRIER GAS AND CONDENSED VAPOR THEREFROM AND TO PROGRESSIVELY HEAT THE FLUID MEDIA MOVING WITHIN SAID PRECEDING PORTIONS OF SAID EVAPORATION CHAMBER; (4) SAID EXTERNALLY DERIVED HEAT ENERGGY IN SAID STEP (2) BEING PROVIDED ADDITIONALLY TO AND AT A TEM HIGHER THAN THE HEAT CONTAINED IN SAID VAPOR ENRICHED CARRIER GAS MOVED THROIUGH SAID CONDENSATION CHAMBER IN SAID STEP (3); (5) SAID HEATING OF SAID MOST ADVANCED PORTIONS OF SAID EVAPORATION CHAMBER IN SAID STEP 2 AND SAID HEATING OF PRECEDING PORTIONS THEREOF IN SAID STEP 3 PROVIDING AMD MAINTAINING SAID SUBSTANTIALLY PROGRESSIVELY INCREASING TEMPERATURE CONDITION WITHIN SAID EVAPORATION CHAMBER; (6) REMOVING SAID CARRIER GAS FROM SAID CONDENSATION CHAMBER.
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