Introduction to the use of rotary evaporator

The rotary evaporator is an evaporation instrument widely used in laboratories for reflow operations, rapid evaporation of large amounts of solvent, concentration of minor components, and reaction processes requiring agitation. The rotary evaporator system can seal the pressure to 400-600 mmHg; the solvent in the distillation flask is heated by a heating bath, the heating temperature can be close to the boiling point of the solvent; and the rotation can be performed at a speed of 50-160 rpm. The solvent is formed into a film to increase the evaporation area. In addition, under the action of a high-efficiency cooler, the hot vapor can be quickly liquefied to accelerate the evaporation rate. Application and principle of rotary evaporator.

The above is the principle. How does it work now?

Rotary evaporator, mainly used to continuously distill a large amount of volatile solvents under reduced pressure. In particular, the concentration of the extract and the distillation of the receiving liquid in the 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. Therefore, the boiling point of the liquid changes with the change of external pressure. If the pressure in the system is lowered by means of a vacuum pump, the liquid can be lowered. The boiling point, in which case substances which are thermally decomposed, oxidized or polymerized without reaching the boiling point during atmospheric distillation can be distilled off before decomposition. As for "rotation", it is meant that the distillation flask containing the sample solution is rotated during the distillation, so that the solvent can be formed into a film to increase the evaporation area. In addition, under the action of a high-efficiency cooler (generally a condenser), the hot vapor can be quickly liquefied to accelerate the evaporation rate.

Can a rotary evaporator be used for distillation?

Rotary evaporators are mainly separated by the different boiling properties of the liquid. For example, separating water and acetone.

Different from the ordinary evaporator, the rotary evaporator does not involve the process of "boiling", and the components of the solution can be collected smoothly. Of course, the buck, low temperature evaporation generally used in the evaporator can also be achieved.

Distilled water has an instrument specially designed for distilled water. The principle seems to be ion exchange, which can obtain deionized water with high purity.

If it is a device that specifically distills water, it is also available. Relatively speaking, the structure is relatively simple, and the price is much cheaper than the rotary steaming and the pure water purifier. This device is also sometimes used to purify deionized water to obtain re-distilled water.

Distilled water is generally not produced by rotary steaming.

Evaporator is used in laboratory research, chemical production laboratory testing, medical testing, etc. in the application of pharmaceutical, chemical, biological products and other industries in the scientific research and production process evaporation, concentration, crystallization, drying, separation, solvent recovery and other processes must Indispensable equipment. Under the negative pressure of the rotary evaporator, the evaporation bottle is rotated in the constant temperature water bath, and the solution forms a film on the bottle wall to increase the evaporation area. Efficient evaporation at low temperature, condensation recovery, concentration and separation of materials.

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