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The Basic Structure and Functions of Rotary Evaporator

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Working Principle of a Rotary Evaporator

Rotary Evaporator
Rotary Evaporator

A rotavap evaporates solvents from samples by utilizing the principle that the solvent will have a lower boiling point at a reduced pressure. Specifically speaking, the stepless speed regulation is adopted to make the evaporation flask rotate at a constant speed. By the rotation, materials can form a large area of uniform thin film on the inner wall of the flask. The evaporation flask is heated evenly by a water or oil bath, and materials, with a lower boiling point, is evaporated rapidly under the vacuum condition. The solvent steam is recycled in the receiving flask after being cooled by the high efficiency glass condenser.

The Basic Structure of a Rotary Evaporator

Rotary Evaporator
Rotary Evaporator
A complete rotary evaporator is generally composed of the following parts, which cooperate with each other and all play an essential role in the working process of a rotary evaporator.
1. Evaporation Flask
The sample can be evaporated at the evaporation flask.
2. Rotary Motor
The rotary motor is used to drive the evaporation flask rotating at a continuous and constant speed in order to obtain a larger evaporation area and higher evaporation efficiency.
3. Vacuum System
The vacuum system can be used to reduce the pressure within the rotary evaporation system so that the solvent will have a lower boiling point at a reduced pressure.
4. Heating Bath
The heating bath is usually a hot water bath, which can be used to heat sample in the evaporation flask and regulate temperature.
5. Condensate Pipe
There are double spiral serpentine condenser coils, vertical condensing glass assembly and other types of condensate pipes, which are used to condense the evaporated sample.
6. Evaporation Pipe
The evaporation pipe has two functions. One is to protect the sample during its rotation, and the other is to enable the vacuum system to suck out samples.
7. Receiving Flask
The receiving flask can recycle the sample after it’s being condensed.

Functions of a Rotary Evaporator

As an essential separation equipment, a rotary evaporator can remove a volatile solvent from a liquid mixture through evaporation and condensation.
  • In industrial field, people use rotary evaporators to extract cbd, which is the main component of mariguana. And cbd is usually used to be made into medicine in pharmaceutical field.
  • In people’s daily life, rotary evaporators are used at home for extracting water from all kinds of juices, which makes juices have a better taste.
  • In chemical and biochemical labs, rotary evaporators are used by professors to extract chemical substances, which will be further applied for other chemical purposes.
  • In recent years, rotary evaporator has been used in the cooking industry. Molecular cooking is a science that applies the principles of chemistry and physics to cooking. To some extent, molecular cooking has been promoted to be a proper term for describing innovative cooking styles.
  • It is synonymous with cutting-edge technology and even psychology. The use of a rotary evaporator to non-heat evaporate liquid, thus retaining volatile aromatics that are easily lost by heating, is a perfect combination of modern culinary and experimental instruments.
It can be seen that a rotary evaporator has a great number of functions, so the rotary evaporator has been quite well-received these days.

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