How to choose a rotary evaporator correctly?

How to choose a rotary evaporator correctly? Rotary evaporator is mainly used for chemical concentration, crystallization, drying, separation and solvent recovery
.

So do you know how to choose the right rotary evaporator? Let’s find out with me below
.

1.
The specifications of the rotary evaporator are distinguished by the volume of the evaporating flask, and the size of the evaporating flask required depends on the quantity of the material to be evaporated
.

Generally speaking, 2L, 3L, and 5L rotary evaporators are suitable for small-scale laboratory experiments; 5L, 10L, and 20L are suitable for pilot trials; 20L and 50L are suitable for pilot trials and production
.

2.
Considering the evaporation rate of the rotary evaporator, for the rotary evaporator of the same specification, there are four main factors affecting the evaporation rate of the rotary evaporator: the temperature of the heating bath, the vacuum degree in the rotary evaporator, the temperature of the cooling medium of the condenser and the rotation speed of the evaporating bottle
.

First, the heating bath temperature, the higher the heating bath temperature, the more violent the material evaporation
.

However, due to the thermal resistance of the material, the commonly used temperature is 60 °C
.

Generally, the heating bath temperature is moderate, the water volatilization rate is low, and the energy utilization rate is high
.

 　　Secondly, in terms of the vacuum degree in the rotary evaporator, the recommended vacuum degree is 95~98kPa (pressure 2~5kPa); in terms of the cooling medium temperature of the condenser, the relationship between the material temperature and the vacuum degree is consistent with the material saturation temperature and saturation.
The relationship between the pressure, when the temperature of the heating bath and the degree of vacuum are determined, the temperature of the cooling medium depends on the type of material
.

 　　In addition, in terms of the rotating speed of the evaporating bottle, the higher the rotating speed of the evaporating bottle, the larger the infiltration area of ​​the inner surface of the bottle, and the larger the heating area; but at the same time, the thicker the liquid film thickness, which increases the heat transfer temperature difference
.

For materials of different viscosities, there are rotational speeds
.

 　　3.
After considering the evaporation rate of the rotary evaporator, choose the supporting equipment
.

The supporting equipment of rotary evaporator refers to vacuum equipment and cold source equipment
.

Generally, it is recommended to use a circulating water vacuum pump or a diaphragm vacuum pump that is resistant to corrosion by various solvents
.

Optional vacuum controller for more controllable distillation process
.

In addition, the cold source equipment is selected according to the temperature of the cooling medium and the amount of evaporation
.

 　　The above is the relevant introduction about the purchase of rotary evaporators.
I believe that everyone has a corresponding understanding of this after reading.
When purchasing, in addition to shopping around, you also choose the appropriate type of evaporator according to the actual situation of the test.
I hope Can help everyone
.