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Rotary evaporator, 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 in the chromatographic separation can separate and purify the reaction product. The basic principle is vacuum distillation, that is, under reduced pressure, the distillation flask is continuously rotated as the solvent is distilled.
Structural principle
Structure: The distillation flask can be a pear-shaped or round-bottomed 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 pipe 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 and 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.
The rotary evaporator's vacuum system allows for a simple water immersion pump that is immersed in a cold water bath or a mechanical vacuum pump with a cooling tube. Evaporating and condensing glass components can be simple or complex, depending on the purpose of the distillation and the nature of the solvent to be distilled. Different commercial devices contain some basic features, and modern devices often add features such as digitally controlled vacuum pumps, digital display heating temperatures, and even steam temperatures.
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