How to solve the problem that the flask of the rotary evaporator is not easy to take down？

The grinded bottle of the rotary evaporator, which has been used for a long time or placed directly for a long time after use, may cause the bottle mouth to lock and cannot be disassembled, often after the completion of the decompression and concentration work.

1. Lubricate the grinding mouth with lubricating oil, and then slowly heat it with an alcohol lamp. After lubricating and heating the bottle mouth, slowly loosen it.

2. Make the hair dryer blow hot air around the bottle mouth, but the temperature cannot be too high all the time to prevent the bottle mouth from overheating, expansion and damage, and the bottle mouth will slowly loosen after being heated.

3. After each use, the bottle mouth should be loosened and placed in a state that is difficult to work for a long time to prevent the bottle mouth from locking up and being unable to be disassembled during the next use.

4. When rotating evaporation, it is generally necessary to pump vacuum. After use, it is necessary to vent air to remove the vacuum state.