Houdini Lab

Is the Use of Rotary Evaporators in Solvent Recovery Outdated?

Rotovaps, which can perform large-scale distillation and evaporation operations at the same time, have evolved into these big-scale stainless-steel containers that can distill massive amounts of solvent at the same time. As a result, the rotovap now plays an important role in the extraction and manufacture of cannabis and hemp, among other things.

Extraction technology has progressed and altered our perceptions of cannabis and hemp consumption. The rotovap is critical to the extraction process because it effectively eliminates extraction solvents by evaporation while causing little damage to the result.


For the most part, the rotovap is employed in post-extraction operations such as refining or recovery following ethanol extraction. Purest concentrates are produced using extraction procedures that use solvents such as butane, propane, or ethanol to remove cannabinoids and terpenes from the trichomes of cannabis plants.


These processes include a purging process, which eliminates solvents from concentrates after they have been processed. Traditional evaporators are equipped with a vacuum pump, and a water chiller is available as an optional component.


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When dealing with high temperatures, chemical compounds and solutions, and converting materials from a liquid to a gas, pressure variations within the rotovap are inevitable.


The chamber of a rotovaps of a smaller size is made of glass in this case. This glass is often designed to resist a specific pressure range and temperature range throughout the manufacturing process. The integrity of the glass has been known to deteriorate during the manufacturing process, resulting in rotovaps exploding while in operation.


The industrial scale has seen the development of methods to change the rotovap into an explosion-proof distillation apparatus that is less prone to breaking and is more efficient in terms of overall heat transfer than the original glass versions, which were previously used.

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