How to Use The Rotary Evaporator？

Rotary evaporator is a kind of evaporation instrument widely used in laboratory. It is suitable for reflux operation, rapid evaporation of a large amount of solvent, concentration of trace components and reaction processes requiring stirring, etc.

The rotary evaporator system can be sealed and decompressed to 400-600 mmHg; the solvent in the distillation flask is heated with a heating bath, and the heating temperature can be close to the boiling point of the solvent; at the same time, it can be rotated at a speed of 50-160 rpm, The solvent is formed into a thin film and the evaporation area is increased. In addition, under the action of the high-efficiency cooler, the hot vapor can be quickly liquefied and the evaporation rate can be accelerated.

How to use the rotary evaporator:

1. Turn on the low temperature coolant circulation pump. Pay attention to press the power button and then press the cooling button, and start the cycle after the temperature is reduced to the desired temperature.

2. Turn on the water pump to circulate the water.

3. Install the distillation flask and secure with clips. Turn on the vacuum pump and start to rotate after a certain vacuum.

4. Adjust the height and rotation speed of the distillation flask, and set the appropriate water bath temperature.

5. After steaming, stop the rotation first, then open the atmosphere, then stop the water pump, and finally remove the distillation flask.

6. Stop the low-temperature coolant circulating pump, stop the heating of the water bath, turn off the water pump to circulate the water, pour out the solvent in the receiving bottle, wash the buffer ball and receive the bottle.

Precautions for the use of rotary evaporator:

1. When using, firstly draw a small vacuum (about 0.03MPa), and then turn on the rotation to prevent the distillation flask from slipping; when it stops, stop the rotation first, hold the distillation flask by hand, and open the atmosphere until the vacuum degree drops to about 0.04MPa. Stop the vacuum pump to prevent the distillation bottle from falling off and sucking back.

2. Each interface, sealing surface, sealing ring and joint need to be coated with a layer of vacuum grease before installation.

3. Water must be added before the heating tank is energized, and dry burning without water is not allowed.

4. If the vacuum degree is too low, pay attention to check the air tightness of each joint, vacuum tube and glass bottle.

5. When rotary-evaporating air-sensitive substances, connect a nitrogen balloon to the exhaust port, first pass a burst of nitrogen gas, exhaust the air in the rotary evaporator, and then connect the sample bottle for rotary evaporation. After evaporating, release nitrogen to increase the pressure, then turn off the pump, and then remove the sample bottle and seal it.

6. If the viscosity of the sample is very large, the rotation speed should be slowed down and rotated slowly by hand, so that a new liquid level can be formed and the solvent can be evaporated.

The rotating shaft is made of high borosilicate glass, and the connecting part is made of Teflon oil seal. The sealing degree is high and the effect is good.

Digital display of speed, stable speed, can set the required rotation speed by speed adjustment, intuitive and convenient.

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