HoneyRamirez HoneyRamirez's blog : Precautions and Principle Analysis of Rotary Evaporator _ Flask
Original title: Precautions and Principle Analysis of Rotary Evaporator Rotary
evaporator Rotary evaporator, also known as rotary evaporator, is a common
laboratory equipment, which is composed of motor, distillation flask, heating
pot, condenser tube and other parts. It is mainly used for continuous
distillation of volatile solvents under reduced pressure, and is used in
chemistry, chemical industry, biomedicine and other fields. Structural principle
of rotary evaporator: The distilling flask is a eggplant-shaped or
round-bottomed flask with a standard ground joint, and is connected with a
pressure reducing pump through a highly refluxing serpentine condensing tube,cbd
centrifugal extractor, and the other opening of the refluxing condensing
tube is connected with a receiving flask with a ground joint for receiving the
evaporated organic solvent. A three-way piston is arranged between the condenser
tube and the pressure reducing pump, when the system is communicated with the
atmosphere, the distillation flask and the liquid receiving flask can be taken
down to transfer the solvent, and when the system is communicated with the
pressure reducing pump,jacketed
glass reactor, the system should be in a pressure reducing state. When
using, the pressure should be reduced first, and then the motor should be
started to rotate the distillation flask. At the end, the machine should be
stopped first, and then the atmosphere should be opened to prevent the
distillation flask from falling off during rotation. As a heat source for
distillation, it is often equipped with a corresponding thermostatic water tank.
Working principle of rotary evaporator: By electronic control, the flask is
rotated at a constant speed at a suitable speed to increase the evaporation
area. The evaporation flask was brought to a negative pressure state by a vacuum
pump. An evaporation flask is place in a water bath for constant temperature
heat while rotating, and that solution in the flask is heated, rotary
vacuum evaporator ,wiped
film distillation, diffused and evaporate in the rotating flask under
negative pressure. The rotary evaporator system can be sealed and decompressed
to 400 to 600 mm Hg; the solvent in the distillation flask is heated by a
heating bath, and the heating temperature can be close to the boiling point of
the solvent; at the same time, the rotary evaporator system can rotate at a
speed of 50 to 160 revolutions per minute, so that the solvent forms a film and
the evaporation area is increased. In addition, under the action of the
high-efficiency cooler, the hot steam can be quickly liquefied and the
evaporation rate can be accelerated. Expand the full text Usage of rotary
evaporator: 1. Turn on the low temperature coolant circulation pump 。 Note that
press the power button and then press the cooling button to start the cycle
after the temperature is reduced to the required temperature. 2. Turn on the
water pump to circulate water 。 3. Mount the distillation flask and secure with
a clip 。 Turn on the vacuum pump and start to rotate when there is a certain
vacuum. 4. Adjust the height of distillation flask , spin speed, and set that
appropriate bath temperature. 5. Stop rotating after steaming ? Open the
atmosphere again, then stop the water pump, and finally remove the distillation
flask. 6 Stop the low-temperature cooling liquid circulating pump, stop the
water bath for heating, turn off the circulating water of the water pump, pour
out the solvent in the receiving bottle, and clean the buffer ball and the
receiving bottle. Precautions for use of rotary evaporator: 1. When in use, a
small vacuum should be pumped first. (About 0.03 MPa), and then start the
rotation to prevent the distillation flask from falling off; when stopping, stop
the rotation first, hold the distillation flask by hand, open the atmosphere,
and stop the vacuum pump when the vacuum degree drops to about 0.04 MPa to
prevent the distillation flask from falling off and sucking back. 2. Each
interface ? Sealing surface, sealing ring and joint shall be coated with a layer
of vacuum grease before installation. 3. Water must be added before the heating
tank is powered on. ? Dry firing without water is not allowed. 4. If the vacuum
degree is too low, pay attention to check the joints. Air tightness of vacuum
tube and glass bottle. 5. During rotary evaporation of air-sensitive substances
Connect a nitrogen balloon to the exhaust port, introduce a burst of nitrogen to
discharge the air in the rotary evaporator, and then connect the sample bottle
for rotary evaporation. After steaming, release nitrogen to boost the pressure,
then turn off the pump, and then take down the sample bottle and seal it. 6. If
the sample is very viscous ? Slow down the rotation speed and rotate slowly by
hand to form a new liquid level to facilitate the evaporation of solvent.
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