Molecular distillation instrumentMolecular distillationIt is a special liquid-liquid separation technology, which is different from the traditional distillation relying on the principle of boiling point difference separation, but relies on the difference in the average free path of the movement of different substances and molecules to achieve separation. Specifically, when the liquid mixture flows along the heating plate and is heated, the light and heavy molecules will escape from the liquid surface and enter the gas phase. Due to the different free paths of light and heavy molecules, the distance traveled by the molecules of different substances after leaving the liquid surface is also different. If the condensate plate is set correctly, the light molecules will reach the condensate plate and be condensed and discharged, while the heavy molecules cannot reach the condensate plate and be discharged along the mixed liquid. In this way, the purpose of material separation is achieved. 
Molecular distillation has the following advantages:
1.Low distillation temperature: If the operation is carried out at a temperature far below the boiling point, as long as there is a temperature difference, the separation purpose can be achieved, which is the essential difference between distillation and conventional distillation.
2.High distillation vacuum: The distillation unit can obtain a high vacuum degree inside, and usually molecular distillation is operated at a very low pressure, so the material is not easy to oxidize and damage.
3.The distillate film is thin and the heat transfer efficiency is high: the distillate material has a short heating time, and the distance between the heated liquid surface and the condensing surface is less than the average free path of the light molecules, so the light molecules escaping from the liquid surface reach the condensing surface almost without collision. Therefore, the heating time of the distilled material is short, and the residence time at the distillation temperature is generally between a few seconds and tens of seconds, which reduces the chance of thermal decomposition of the material.
4.Higher degree of separation: Substances that are not easily separated by conventional separations can be separated.
5.No boiling bubbling phenomenon: it is the free evaporation on the surface of the liquid layer, which is carried out at low pressure, and there is no dissolved air in the liquid, so the whole liquid cannot be boiled during the distillation process, and there is no bubbling phenomenon.
6.Non-toxic, harmless, non-polluting, no residue: pure and safe products can be obtained, and the operation process is simple, and the equipment is less. Distillation technology can separate substances that are not easy to separate by conventional distillation.
7.Expensive equipment: The distillation device must ensure that the system pressure reaches a high vacuum, the material sealing requirements are high, and the distance between the evaporation surface and the condensing surface should be moderate, the equipment processing is difficult and the cost is high.
8.Low energy consumption: due to the low superheat loss of the whole separation of distillation, and due to the unique structure of the distillation device, the internal pressure is extremely low, and the internal resistance is much smaller than that of conventional distillation, so it can greatly save energy consumption.
9.In the actual industrial application, it has the following obvious advantages over conventional distillation technology: it provides a better separation method for the separation of high boiling point, heat-sensitive and easily oxidized materials; It can effectively remove substances in liquids, such as organic solvents, odors, etc.; The target product can be selectively evaporated to remove other impurities; Through multi-stage separation, more than 2 kinds of substances can be separated at the same time; The fractionation process of molecular distillation is a physical process, so it can protect the separated substances from contamination and damage.