FIELD: chemical engineering; molecular distillation of substances. SUBSTANCE: apparatus incorporates vertically positioned still, vapor heating oven varying in height and positioned so that its top is fixedly secured at working zone and its bottom is associated with evaporator located above stuff surface and secured in position by holder disposed for downward movement along still, and means for maintaining temperature of major amount of stuff below evaporation temperature with the aid of heat-exchanger. EFFECT: more sophisticated design. 4 cl, 3 dwg
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