Rotary evaporator is also called rotary evaporator. It is mainly used in the laboratory, such as motor, distillation flask, heating pot, condenser tube and so on.
What are the structures and advantages and disadvantages of the rotary evaporator?
(1) Structure of the rotary evaporator
1. Rotating the motor to drive the evaporation bottle containing the sample by the rotation of the motor;
2, the evaporation tube, the evaporation tube has two functions, first to play the role of the sample rotation support shaft, and secondly through the evaporation tube, the vacuum system to suck the sample;
3. A vacuum system for reducing the pressure of the rotary evaporator system;
4, the fluid heating pot, usually under water to heat the sample;
5, the condensation tube, using double serpentine condensation or other condensing agents such as dry ice, acetone condensation samples;
6. Condensate the sample collection bottle. After the sample is cooled, it enters the collection bottle.
Mechanical or motor mechanisms are used to quickly lift the evaporation flask in the heating pot.
The rotary evaporator's vacuum system allows for a simple water immersion pump that is immersed in a cold water bath or a mechanical Vacuum Pump with a cooling tube. Evaporating and condensing glass components can be simple or complex, depending on the purpose of the distillation and the nature of the solvent to be distilled. Different commercial devices contain some basic features, and modern devices often add features such as digitally controlled vacuum pumps, digital display heating temperatures, and even steam temperatures.
(B) the advantages and disadvantages of rotary evaporator
Rotary evaporators have the following advantages:
1. All rotary evaporators  have a built-in lift motor that automatically raises the flask to a position above the heating pot when the power is off.
2. Due to the centripetal force and friction between the liquid sample and the evaporation bottle, the liquid sample forms a liquid film on the inner surface of the evaporation bottle, and the heat receiving area is large;
3. The force generated by the rotation of the sample effectively suppresses the boiling of the sample. The combination of features and convenience allows modern rotary evaporators to be used to quickly and gently distill most samples, even for operators with no operational experience.
The biggest drawbacks of rotary evaporator applications:
It is the boiling of certain samples, such as ethanol and water, which will cause the experimenter to collect the loss of the sample. In operation, it is usually possible to prevent boiling by carefully adjusting the working strength of the vacuum pump or the temperature of the heating pot during the mixing phase of the distillation process. Alternatively, it is also possible to add anti-boiling particles to the sample. For samples that are particularly difficult to distill, including samples that are prone to foaming, special evaporating tubes can be configured for the rotary evaporator.
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