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Rotary Evaporator

Last updated: November 22, 2021

What Does Rotary Evaporator Mean?

A rotary evaporator is a piece of machinery or equipment used in the creation of some cannabis extracts. A rotary evaporator evaporates and recovers pricey ethanol.

Rotary evaporators are one of the key steps in creating butane hash oil (BHO) and other extracts. Using the rotary evaporator helps effectively extract the oil to a concentration of 15 to 40 per cent. It also purges the solvents from the finished product and recovers them, making the oil exceptionally pure.

A rotation evaporator is comprised of a boiling flask that rotates on its side to coat the interior with a thin film that greatly enhances the evaporation process. The use of a vacuum helps protect fragile substances that might be sensitive to excessive heat. Many commercial companies manufacturer rotary evaporators.

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Maximum Yield Explains Rotary Evaporator

The rotary evaporator is composed of four components that function in unison: the rotor, condenser, heat bath, and solvent trap. A vacuum pump or aspirator are also attached to the rotary evaporator.

There is usually a bump trap and round bottom flask to hold the cannabis. The flask of the rotary evaporator rotates, which helps increase the evaporation rate significantly compared to other forms of evaporators that are available that do not rotate. The rotation also prevents overheating.

After cannabis goes through the entire process of rotary evaporation, the remaining extracted product is normally a glassy, amber-colored oil substance. In addition, the ethanol solvent that was removed can be reused.


The information on this page is purely informational and should not be considered instructional. The creation of cannabis extracts can be extremely dangerous and requires a full understanding of the process and risks involved.

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