What are the advantages and disadvantages of rotary evaporators?
What are the advantages and disadvantages of rotary evaporators?
https://www.zzkdmachinery.com/equipment/rotary-evaporator.html
Rotary evaporator, also known as rotary evaporator, is an evaporation instrument widely used in laboratories. It consists of a motor, a distillation flask, a heating pot, a condenser tube and other parts. It is mainly used for continuous distillation of volatile solvents under reduced pressure conditions. , used in chemistry, chemical industry, biomedicine and other fields.
The basic principle of the rotary evaporator is vacuum distillation, that is, under reduced pressure, when the solvent is distilled, the distillation flask is continuously rotating.
The advantages and disadvantages of the rotary evaporator are introduced:
1. Advantages
1. All rotary evaporators have a built-in lift motor, which can automatically lift the flask to the position above the heating pot when the power is turned off.
2. Due to the centripetal force and friction between the liquid sample and the evaporating bottle, the liquid sample forms a liquid film on the inner surface of the evaporating bottle, and the heating area is large;
3. The force generated by the rotation of the sample effectively inhibits the boiling of the sample. Combined with these features and their convenience, modern rotary evaporators can be used to quickly and gently distill most samples, even by inexperienced operators.
2. Disadvantages
Boiling of certain samples, such as ethanol and water, will result in loss of samples collected by the experimenter. In operation, boiling can usually be prevented by carefully adjusting the working intensity of the vacuum pump or the temperature of the heating pot during the mixing stage of the distillation process. Alternatively, by adding anti-boiling particles to the sample. For samples that are particularly difficult to distill, including samples that are prone to foaming, the rotary evaporator can also be equipped with special condenser tubes.