Distillation under reduced pressure is one of the common methods for separating purifying organic compounds. It is especially suitable for those substances that have been thermally decomposed, oxidized or polymerized before reaching the boiling point during common pressure distillation. It is mainly composed of four parts: distillation, pumping(decompression), safety protection and pressure measurement.

       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 changes with the external pressure. If the pressure in the system is reduced by means of a vacuum pump, the boiling point of the liquid can be lowered, which is the theoretical basis for vacuum distillation operation.

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