How to Use a Rotary Evaporator?

What is a Rotary Evaporator?

Rotary evaporators are essential equipments for the processes of evaporation, concentration, crystallization, drying, separation, and solvent recovery in pharmaceutical, chemical and bio-pharmaceutical fields and other fields. It’s usually used to remove solvents from a mixture of compounds.

How to Use a Rotary Evaporator?

Only when rotary evaporators are used properly can they play greater role and function in many fields. There are some instructions that can be followed in order to use rotary evaporators better and more properly.

Before the use

Before using a rotary evaporator, it’s necessary to check it first in order to keep it work smoothly. Firstly, the deionized water in the water bath should be 2/3 of the content of the pot. Secondly, the water in the condenser case is full 2/3. Thirdly, the vacuum exhaust pipe should be connected with the fume hood and it should be smooth. Last but not least, the solvent receiving flask of the unit should always be emptied prior use to prevent accidentally mixing of incompatible chemicals.

In the use

After checking the rotary evaporator, we are about to start operating it:

use rotary evaporator
The Use of a Rotary Evaporator

1. Use your right thumb, forefinger and middle finger to grasp the edge of the interface on the rotary head to connect to the connection port and rotate it for 1/3 of the turn. The left hand rotates the clip to fix the rotary head on the connection port.

2. Install the flat-bottomed flask with the sample at the lower port of the rotary head and hold it with your right hand.

3. Turn on the vacuum pump with your left hand and slowly evacuate. Keep your eyes on whether the solution in the bottle is boiling. If there is boiling, turn off the small vacuum immediately. Generally, the vacuum will stop at about 0.7.

4. Lower the flask into the water bath, and stare at whether the solution in the bottle is boiling. If there is a boiling condition, immediately reduce the speed and turn off the vacuum until the drops of solution are collected in the waste bottle.

5. Generally, it is steamed to 1 mL, which is the size of a one-yuan coin. When the solution in the flask is about 1.3 mL, the flask is removed from the water bath and rotated in the air.When the volume of the solution is 1 mL, stop rotating immediately, hold the flask in your right hand, and slowly release the vacuum. Finally, turn off the vacuum pump switch, remove the flask, cap the bottle, and seal it for later use.


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