Brief introduction of rotary evaporator operation

Rotary evaporator is an evaporation instrument widely used in the laboratory, suitable for rapid evaporation of large amounts of solvent, concentration of trace components, reflux operation, and reaction processes that require stirring. The rotary evaporator system can seal and reduce the pressure to 400-600 mm Hg; use a heating bath to heat the solvent in the distillation flask, the heating temperature can be close to the boiling point of the solvent; at the same time, it can also be rotated at a speed of 50-160 rpm Make the solvent form a thin film and expand the evaporation area. In addition, under the action of a high-efficiency cooler, the hot steam can be quickly liquefied to speed up the evaporation rate.

The above is the principle of the rotary evaporator, so how does it work?

Rotary evaporator is mainly used to continuously distill a large amount of volatile solvents under reduced pressure. Especially for the concentration of the extract and the distillation of the receiver during chromatographic separation, the reaction product can be separated and purified. Its basic principle is vacuum distillation. Generally speaking, the "boiling point" of a liquid refers to the temperature when its vapor pressure is equal to the external pressure. Therefore, the boiling point of the liquid will change with the change of the external pressure. Boiling point, in this case, those substances that will be decomposed, oxidized or polymerized by heating without reaching the boiling point during atmospheric distillation can be distilled out before decomposition. As for "spin", it means that the distillation flask containing the sample solution is rotated during the distillation process, so that the solvent can form a thin film and increase the evaporation area. In addition, under the action of a high-efficiency cooler (generally a condenser), the hot steam can be quickly liquefied to speed up the evaporation rate.

Can rotary evaporator be used for distillation?

Rotary evaporator is mainly used to separate liquid boiling point properties. For example, separating water from acetone.

Different from ordinary evaporators, the rotary evaporator does not involve the process of "boiling", and the solution components can be collected smoothly. Of course, the evaporator used for general pressure reduction and low temperature evaporation can also be used.

Distilled water has special equipment for making distilled water. The principle seems to be ion exchange, which can obtain deionized water with high purity.

If it is a specialized distilled water device, there are also. Relatively speaking, the structure is relatively simple, and the price is much cheaper than that of rotary steamer and pure water purifier. This device is sometimes used to purify deionized water to obtain double distilled water.

Distilled water is generally not made by rotary steaming.

The evaporator is used in laboratory research, chemical production laboratory testing, medical inspection, etc. It is necessary to evaporate, concentrate, crystallize, dry, separate and other processes in the scientific research and production processes of pharmaceutical, chemical, biological products Indispensable equipment.