Method and apparatus for high volume distillation of liquids

Abstract From the Canadian patent

A method and apparatus for high volume distillation of impure liquid comprises evaporating the impure liquid in an evaporator to form a vapor at a temperature above the freezing point and below the critical point preferably, the boiling point, of said liquid at atmospheric pressure and at a pressure not exceeding a pressure corresponding to the evaporation temperature under saturated conditions; compressing the vapor; passing at least a portion of the compressed vapor through an expansion engine to do work upon and motivate the engine and to produce shaft energy whereby, the vapor expands and cools; adding work to the expansion engine to make up the difference between the work done in …