The same is distillation, what are the advantages of molecular still?

     Compared with conventional distillation, molecular distillation has the following incomparable characteristics:
(1) Low operating temperature, which can greatly save energy. Conventional distillation relies on the difference in boiling point of different substances in the material mixture. Molecular distillation is separated by the difference in the mean free path of molecular motion of different substances. It is required that the material must reach a boiling state, and separation can be achieved as long as the molecules are volatilized from the liquid phase. Because molecular still operates at a distance from the boiling point, the energy consumption of the product is small.
(2) The distillation pressure is low, and it is required to operate under high vacuum. The mean free path of molecular motion is inversely proportional to the system pressure. Only by increasing the vacuum can a large enough mean free path be obtained. Studies have shown that the degree of vacuum in molecular distillation is as high as 0.1-100 Pa.
(3) Short heating time reduces thermal damage of heat sensitive substances. Since molecular still is achieved by utilizing the difference in the mean free path of molecular motion of different substances, the basic requirement is that the distance between the heating surface and the condensation surface must be smaller than the moving mean free path of the light molecule. This distance is usually small, so the light molecule is After the liquid surface escapes, there is almost no collision, that is, it is directed to the condensation surface, so the heating time is extremely short. The research indicates that the molecular distillation heats time is only a few seconds or tens of seconds, thereby avoiding the decomposition or polymerization of substances in the large-range short-range molecular distiller.