Precautions for the use of vacuum pumps

The quality of the vacuum pump depends on its mechanical structure and the quality of the oil. It must be well protected when using the vacuum pump. If the volatile organic solvent is distilled, the organic solvent will be absorbed by the oil, which will increase the vapor pressure, thereby reducing the evacuation efficiency. The turbid liquid is pumped out and the vacuum pump is damaged.

Therefore, the following points must be paid attention to when using the vacuum pump:

Between the distillation system and the vacuum pump, an absorption device must be installed.

Before distillation, the vapor of organic solvent in the system must be completely evacuated with a water pump.

If a pump can be used to pump air, use a pump as much as possible. If the distillate contains volatile substances, the pump can be used to reduce the pressure and then use an oil pump.

The decompression system must be kept airtight, all rubber stoppers should be of suitable size and holes, and the rubber tube should be a rubber tube for vacuum. Ground glass coated with vacuum grease.