What to do if rotary evaporator cannot be vacuumed?

Rotary evaporators are mainly used to continuously distill large amounts of volatile solvents under reduced pressure. During use, rotary evaporators sometimes have some minor problems that must be dealt with in a timely manner to ensure normal operation.

So, what to do if the vacuum rotary evaporator cannot be vacuumed?

I. Inspection items:

1. There is solvent in the container, which is limited by the saturated ejector pressure.

2. The vacuum hose joint is loose and the vacuum gauge is leaking.

3. The capacity of the vacuum oil pump has decreased.

4. There are debris in the discharge valve and pressure control valve.

5. The glass wool sandwich panel is damaged.

II. Solutions:

1. Empty the solvent and test with an empty bottle.

2. Check and eliminate section by section along the vacuum pipeline.

3. Change the oil (water) of the vacuum oil pump, clean and repair.

4. a. Reassemble, clean the grinding mouth of the glass wool sandwich panel, apply vacuum silicone grease, align and tighten the flange. b. Replace the failed sealing ring.

5. Clean.

6. Replace or repair.

The basic principle of laboratory rotary evaporator is the vacuum distillation under the continuous rotation of the distillation flask. As the heat source of distillation, it is often equipped with a corresponding constant temperature water tank.