What’s the operation procedure of the rotary evaporator?

Rotary evaporator is a necessary instrument for distillation and extraction in scientific research,the evaporation velocity depends on three conditions:vacuum, water temperature and cooling water temperature.Specifically, the main factor is that the higher degree of vacuum, the faster the evaporation rate, the vacuum degree (when the water evaporates) is ≥0.096 MPa; the second is that the higher the water temperature, the faster the evaporation rate, but generally does not exceed 80 ° C; the third is the lower the cooling water temperature. The faster the speed, the better the effect of using cooling water.

rotary evaporator
rotary evaporator

Now let’s talk about the operation procedure of the rotary evaporator.generally speaking,the operation procedure can be divided into several steps:vacuum pumping,feeding,heating,rotating,turning on cooling water and Recycling solvent

Vacuum pumping

If the vacuum is not found after opening the vacuum pump, check whether the bottle mouth is sealed, check whether the vacuum pump itself leaks, check whether the sealing ring at the rotating shaft is intact, and connect a vacuum switch in the external vacuum tube to increase the evaporation rate and recovery rate. It is found that when the vacuum is not pumped, it should be checked whether the bottle mouth is sealed, whether the vacuum pump itself leaks, whether the sealing ring at the rotating shaft is intact, and a vacuum switch connected in series with the external vacuum tube can finely adjust the evaporation speed.


Using the system vacuum negative pressure ,the liquid material can be inhaled by teflon hose at the feeding port. The liquid material should not exceed half of the rotating bottle.The rotary evaporator can be continuously fed. When feeding, it is necessary to turn off the vacuum pump, stop heating, and slowly open the feeding valve cock after the evaporation stops to prevent backflow.


The water bath of Lanfan rotary steaming must be added water first and then turn on the power. The temperature control range is 0-400 °C.because of the existence of thermal inertia,so the actual water temperature is about 2 degree higher than the setting temperature.Setting value can be corrected when using.Temperature setting mode is as follows:Switch on the water bath to set the required temperature,Press the SET button to display the SP in the upper row.press shift button to flash the number to be modified,Press the up or down button to display the lower row as the desired value.Press the set button again to return to the standard mode.

This instrument is equipped with a specially designed lifting water bath pan. When in use, water must be added before power on. Dry burning is strictly prohibited. Add water in the water bath should ensure that the rotating bottle immersed in water 1/3 ~ 1/2.


Turn on the speed switch to adjust the torque to the optimal speed, taking care to avoid the water vibration wave.

Turning on cooling water

Recycling solvent

Turn off the vacuum pump ——turn on the feeding switch —— release air—— take out the solvent in the collection bottle.

rotary evaporator
rotary evaporator

These above are the operation procedure of the rotary evaporator we summarize for you .Please use the instrument according to the operation procedure.Of course, the correct method of rotary evaporator installation is the premise of operation, please refer to the website news page for the correct method of rotary evaporator installation.

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