Laboratory rotary evaporators typically operate under vacuum conditions to reduce the boiling point of liquids and evaporate solvents. The working vacuum is a key parameter, usually measured in pressure units of millibars (mbar) or pascals (Pa).

Specifically, the working vacuum of laboratory rotary evaporators is usually within the range of hundreds to tens of pascals (or corresponding millibars). The common vacuum range may be between 1 mbar and 200 mbar, but it depends on the model and design of the instrument.

When using a laboratory rotary evaporator, it is necessary to ensure that the instrument can maintain the required working vacuum and make adjustments based on specific sample and experimental needs. The instrument may be equipped with a vacuum pump or vacuum system to provide the required vacuum environment. During operation, it is important to carefully monitor the vacuum level to ensure the normal operation of the instrument and the success of the experiment.

The following suggestions and precautions:

Vacuum system inspection: Regular inspection and maintenance of the vacuum system of the rotary evaporator is very important. Ensure the normal operation of the vacuum pump and inspect the seals, valves, and pipelines to prevent leakage.

Vacuum oil: If using a vacuum pump, pay attention to maintaining the quality of the oil in the vacuum pump. Regularly replace and maintain the vacuum pump oil to ensure the operation of the system.

Cooling system: Some rotary evaporators require a cooling system to cool the condenser, ensuring a normal supply of cooling water or other cooling media.

Monitoring temperature: Controlling the temperature inside the evaporation bottle is crucial. Ensure that the heating system can maintain the required temperature to ensure control of the evaporation process.

Prevent sample foam: during vacuum evaporation, some samples may produce foam, which may affect the evaporation efficiency. Use appropriate devices or methods to reduce the production of foam.

Regular maintenance: Conduct regular maintenance and cleaning, including cleaning and replacing seals, cleaning condensers and evaporation bottles, to ensure long-term stable operation of the equipment.