What is a rotary evaporator used for?

In chemical labs, a rotary evaporator (sometimes called a rotavap) is used to evaporate solvents quickly and gently from samples.

Distillation is the process of separating a given mixture into its constituents depending on their different volatilities by evaporation and condensation (liquid-gas-liquid).

The rotary evaporator machine has advanced dramatically since its creation, and it is now employed in a variety of applications across the world. In this post, we’ll look at how rotary evaporators are used in a variety of applications.

Working Principle of Rotatory Evaporator

The operating concept of a rotatory evaporator is that the boiling point of liquids decreases as the pressure is reduced. When cooked in a typical environment, the solvent vaporizes at lower temperatures. For your rotavap, you should pick a vacuum pump that will boost evaporation efficiency.

Rotatory evaporation is commonly used to separate low boiling solvents like ethyl acetate or n-hexane from solid-at-room-temperature compounds. With careful monitoring, a liquid substance can be used to eliminate a solvent from a sample.

Even solvents with significantly greater boiling points, such as water, can evaporate if the instrument can endure external pressures.

By freezing and cooling the vapor, the condenser condenses the gas into a liquid. Liquid nitrogen, cold water, and dry ice may all be utilized to produce these shallow temperatures. To enhance the evaporation surface area per unit time, the evaporation vessel rotates continuously.

The liquid remains adhered to the jar’s interior due to the centrifugal force created by the spinning, giving a wide surface area and speeding up the evaporation process.

A 3-way piston connects the pressure reduction pump and the condenser tube. The evaporation flask is removed once the operating system is linked to the pressure to extract the residue.

What technique is used in the rotary evaporator?

Simple distillation is a time-consuming process that is made more difficult by setting up and cleaning the equipment. The use of rotary evaporator results in a significant increase in efficiency (“rotovap”). This reduces the time it takes to remove ether from a couple of hours to about 20 minutes.

The device operates based on vacuum distillation, according to the basic theory. Rotating the “pot” produces agitation, keeps the liquid in touch with a warming bath (typically hot water), and increases the surface area of the liquid is evaporated.

However, there is a price to pay: the seal (which is located in the white box that houses the engine) is a common source of air leakage. Cooling the collecting flask reduces the quantity of solvent vapor that enters the water stream from the aspirator; in many circumstances, a dry ice trap is required to prevent organic solvent contamination of wastewater.

The distilled solvent is collected using an effective spiral condenser. The intended product usually has a low enough vapor pressure to avoid distillation.

What is a rotary evaporator used for?

As previously stated, scientists utilize a mini rotary evaporatorto separate solvents from liquids. Among other things, rotary evaporators are used for the following three purposes:

  1. Pharmaceutical sector

The rotary evaporator is used to separate chemical solvents in the pharmaceutical business.

It’s also utilized to make a variety of high-quality medicinal items. Because of its low boiling point influence on solvents, rotary evaporators are vital in the pharmaceutical business. This makes it simple to deal with a wide range of chemicals and chemical solvents to create high-quality pharmaceutical goods at a low cost.

Separating solvents in polymeric, organic, and inorganic materials is another application for industrial rotary evaporators. This facilitates the development of pharmaceutical medications by scientists. The device has grown more appealing for pharmaceutical usage since it separates solvents from liquids without generating an azeotrope.

  1. For educational purposes

Students may learn more about evaporation and condensation procedures using a rotary evaporator. The educational rotary evaporator has various beneficial applications and may be implemented by students, making it a valuable tool in the classroom.

Students will learn how to extract volatile fragrance from various mixtures at shallow temperatures in addition to separating the solvent from the liquids. They will remove the required taste from alcoholic beverages, fruits, and herbs without heating the combination.

They will also learn how to focus on non-volatile components in a mixture. By removing the water, they would concentrate the fresh and pure flavors of blood orange.

Because educational rotary evaporators have a wide range of applications, students must understand more about them and how they may be used. They will discover that the rotary evaporator is suitable for various applications, including pharmaceuticals, kitchens, chemical engineering, and industries, among others.

  1.  Useof chemicals

When it comes to chemical engineering, the laboratory rotary evaporator is crucial. When it comes to chemical engineering, the processes of crystallization, evaporation, separation, drying, and solvent recovery are critical, and a rotary evaporator is required to accomplish this.

As previously stated, rotary evaporation applications have moved to the cooking sector, resulting in molecular cooking.

Molecular cooking, commonly referred to as molecular gastronomy, is a scientific chemical principle used in the food industry. A rotary evaporator is used to separate two chemical components in liquids and create an aromatic scent.


You’ve probably figured out the uses of rotary evaporators its importance in our lives. A rotary evaporator’s primary function is to separate liquids from solvents. To know more about rotatory evaporators with vacuum pump prices, you can consult the experts. Last but not least, the rotary evaporator is one of the most valuable devices in today’s world since it can be utilized in various applications.

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Christophe Rude

Christophe Rude

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