Advantages of using a 20l rotary evaporator
Rotary evaporator, also known as rotovap for sale, is a commonly used laboratory equipment. It consists of a rotary motor, a distillation bottle, a recovery bottle, a heating pot, a condenser tube, etc. It is mainly used for continuous distillation of volatile solvents under reduced pressure conditions. It is an important instrument for scientific research laboratories (concentration, extraction, drying, separation, crystallization) of chemistry, pharmacy, material engineering, biomolecules, food, disease control and other scientific research laboratories in pharmaceutical research and development and pharmaceutical production, chemical industry, colleges and universities.
Structural principle:
The distillation flask is an eggplant-shaped or round-bottomed flask with a standard ground mouth interface, which is connected to a decompression pump through a high reflux serpentine condenser, and the other opening of the reflux condenser is connected to a receiving flask with a ground mouth for use. Receive evaporated organic solvent. There is a three-way piston between the condenser tube and the decompression pump. When the system is connected to the atmosphere, the distillation flask and the liquid-contacting flask can be removed to transfer the solvent. When the system is connected to the decompression pump, the system should be in a reduced state. pressure state. When in use, the pressure should be reduced first, and then the motor should be started to rotate the distillation flask. At the end, it should be stopped first and then vented to the atmosphere to prevent the distillation flask from falling off during rotation. As a heat source for distillation, it is often equipped with a corresponding constant temperature water tank.
Working principle:
Through electronic control, the flask is rotated at a constant speed at a suitable speed to increase the evaporation area. The evaporating flask is under negative pressure by means of a vacuum pump. The evaporating flask is placed in a water bath for constant temperature heating while rotating, and the solution in the flask is heated, diffused and evaporated in the rotating flask under negative pressure. 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; it can also 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 device. 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 circulating water of the low temperature device.
3. Install the distillation flask and secure with clips. Turn on the circulating water vacuum pump/anti-corrosion diaphragm 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 circulation 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 above is advantages of using a 20l rotary evaporator. If you have needs, you can contact Zhengzhou Keda Machinery Equipment Co., Ltd. For decades, Zhengzhou Keda Machinery Equipment Co., Ltd. has been committed to the production and manufacture of laboratory instruments and pipe fittings.
If you want to know about our products, or want to buy our instruments, please feel free to contact us, we will be happy to help you.
