What are the precautions for using a small rotary evaporator?

Precautions for a small rotary evaporator:

1. When using, first draw a small vacuum (about 0.03MPa), then start rotating to prevent the distillation flask from slipping; when stopping, first stop rotating, hold the distillation flask with your hand, let it enter the atmosphere, and wait until the vacuum drops to about 0.04MPa, then stop the vacuum pump to prevent the base distillation flask from falling off and sucking back.

2. Each ground port, sealing surface sealing ring and joint need to be coated with a layer of vacuum grease before installation.

3. Water must be added to the heating tank before powering on, and dry burning without water is not allowed.

4. If the vacuum is too low, pay attention to check the air tightness of each joint, vacuum tube, and glass bottle.

5. For materials that are sensitive to air during spinning, connect the nitrogen balloon to the exhaust port, first pass a burst of ammonia, rotate the small rotary evaporator out of the air, and then connect it to the spinning sample bottle. After steaming, release the ammonia to pressurize, then turn off the pump and take out the sealed sample bottle.

6. If the sample viscosity is high, the speed should be slowed down. It is best to rotate slowly manually to form a new liquid surface to facilitate evaporation of the solvent.