Rotary evaporator, also called rotary evaporator, is a commonly used equipment in laboratories. It consists of a motor, distillation flask, heating pot, condenser, etc. It is mainly used for continuous distillation of volatile solvents under reduced pressure. It is used in biomedicine, Chemical, chemical and other fields. Attention should be paid to the use of rotary evaporator:

1. The water bath is not allowed to dry without water, add water before powering on.
2. The air-tightness of each joint, vacuum tube, and glass bottle will affect the vacuum degree, so check it frequently.
3. Each interface, sealing surface, sealing ring and joints need to be coated with a layer of vacuum grease before installation.
4. If the distilled sample has a high viscosity, the rotation speed should not be too fast. It is best to rotate slowly manually to form a new liquid level to facilitate the evaporation of the solvent.
5. When using, draw a small vacuum first, and then rotate to prevent the distillation flask from slipping; when stopping, stop the rotation first, hold the distillation flask with your hands, and let the atmosphere open, and then stop the vacuum pump when the vacuum drops to about 0.04MPa to prevent distillation The bottle falls off and sucks upside down.
6. When rotary evaporation is sensitive to air, connect a nitrogen ball to the exhaust port, pass a burst of nitrogen first to exhaust the air in the rotary evaporator, and then connect the sample bottle to the rotary evaporator. After steaming, release the nitrogen and increase the pressure, then turn off the pump, and then remove the sample bottle and seal it.