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The Proper Vacuum for Concentrating Extract Using a Rotary Evaporator

After winterized extract has been filtered, a rotary evaporator, or rotavap, is used to concentrate the extract by evaporating off most of the remaining ethanol. Major objectives in this process are to quickly concentrate the mixture of crude oil and ethanol to the point where it is only a few percent ethanol, to recover the evaporated ethanol for later use, and to keep the evaporation process under control to prevent loss of crude oil.

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