How does a rotary evaporator work?

Rotary evaporator is an evaporation instrument widely used in laboratories, suitable for reflux operation, rapid evaporation of a large amount of solvent, concentration of trace components, and reaction processes that require stirring
.

The rotary evaporator system can be sealed and decompressed to 400-600 mm Hg; 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
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In addition, under the action of the high-efficiency cooler, the hot vapor can be quickly liquefied and the evaporation rate can be accelerated
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Application and principle of rotary evaporator
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Rotary evaporator is an instrument mainly used for continuous distillation of a large number of volatile solvents under reduced pressure
.

In particular, the concentration of the extract and the distillation of the receiving liquid during chromatographic separation can separate and purify the reaction product
.

Its basic principle is vacuum distillation
.

Generally speaking, the "boiling point" of a liquid refers to the temperature at which its vapor pressure is equal to the external pressure, so the boiling point of the liquid will change with the change of the external pressure.
If the pressure in the system is reduced by means of a vacuum pump, the liquid's Boiling point, so that those substances that would be thermally decomposed, oxidized or polymerized without reaching the boiling point during atmospheric distillation can be distilled out before decomposition
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As for "rotation", it means that the distillation flask containing the sample solution is rotated during the distillation process, which can make the solvent form a thin film and increase the evaporation area
.

In addition, under the action of a high-efficiency cooler (usually a condenser tube), the hot vapor can be quickly liquefied and the evaporation rate can be accelerated
.

Can a rotary evaporator be used for distillation? Rotary evaporators are mainly used to separate liquids by different boiling point properties
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Such as the separation of water and acetone
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 　　Different from ordinary evaporators, the rotary evaporator does not involve the process of "boiling", and the solution components can be collected smoothly
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Of course, it can also be done by a general evaporator with reduced pressure and low temperature evaporation
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 　　Distilled water has a special equipment for making distilled water.
The principle seems to be ion exchange, which can obtain deionized water with high purity
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 　　If it is a special device for distilled water, there are also some
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Relatively speaking, the structure is relatively simple, and the price is much cheaper than that of rotary steamers and water purifiers
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This unit is also sometimes used to purify deionized water to obtain double distilled water
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 　　Rotary distillation is generally not used to make distilled water
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 　　Evaporators are used in laboratory research, chemical production laboratory testing, medical inspection, etc.
in the scientific research and production processes of pharmaceutical, chemical, biological products and other industries.
Evaporation, concentration, crystallization, drying, separation, solvent recovery and other processes Instrumentation
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Under the negative pressure condition of the rotary evaporator, the evaporating bottle is rotated in a constant temperature water bath, and the solution forms a film on the bottle wall to increase the evaporation area
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Efficient evaporation at low temperature, condensation recovery, concentration and separation of materials
.