FIELD: evaporation of solutions. SUBSTANCE: method involves evaporating basic solution by direct contact with neutral intermediate heat-carrier, which does not mix with this solution; effectuating adiabatic compression of obtained secondary vapor; providing transmission of compressed secondary vapor heat to intermediate heat-carrier during condensation of secondary vapor; separating liquid heat-carrier from evaporated solution and secondary vapor condensate. Method is characterized in that vaporous intermediate heat-carrier is supplied for evaporation of basic solution and in that transmission of heat to intermediate heat-carrier during condensation of secondary vapor is provided through wall. When evaporation aqueous solutions is effectuated, organic compound is used as intermediate heat-carrier. When organic solutions are to be evaporated, water is used as intermediate heat-carrier. EFFECT: increased efficiency of method and enhanced reliability in operation of device. 3 cl, 1 dwg
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