Basic introduction of rotary evaporator - Huaqiang Electronic Network

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Basic introduction to the rotary evaporator

The rotary evaporator is an evaporation instrument widely used in laboratories. Suitable 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. It is mainly used for continuous distillation of 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.

The basic principle of the rotary evaporator is vacuum distillation, that is, under reduced pressure, when the solvent is distilled, the distillation flask is continuously rotated. It is mainly used for continuously distilling a large amount of volatile solvent 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.

Structure: The distillation flask is a pear or round bottom flask with a standard ground port, connected to a pressure reducing pump via a highly refluxing serpentine condenser, and the other opening of the reflux condenser is connected to a receiving flask with a grinding port. It is used to receive the evaporated organic solvent. There is a three-way piston between the condensing tube and the decompression pump. When the system is connected to the atmosphere, the distillation flask and the liquid-receiving flask can be removed and the solvent is transferred. When the system is connected with the decompression pump, the system should be reduced. Pressure state. When using, depressurize first, then start the motor to rotate the distillation flask. At the end, stop the machine first, then pass 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.