-
WhatsApp
-
Email
Molecular distillation, also known as short path distillation or undamped distillation, is a non-equilibrium continuous distillation process carried out in a high vacuum environment, and it is also a high-efficiency new liquid-liquid separation technology without boiling. In the distillation process , through special measures, the molecular flow leaving the liquid phase is increased and the molecular flow returning to the liquid phase is reduced, to realize the flow direction of a single molecular flow from the liquid phase to the gas phase, especially suitable for separation, concentration and purification of high Molecular weight, low volatility organic mixtures and plant natural products. Since the temperature of molecular distillation is lower than the boiling point of the material, the structure and activity of heat-sensitive substances are protected, so this technology is often used in the extraction of purely natural health products, which can avoid the drawbacks of traditional chemical treatment methods and bring product quality to a new level.
Today we introduce our company's main product - 10 liter Short path distillation
This short path distillation system has a capacity of 10L and its short path distillation equipment for sale is independent. Compared to the distillation elbow of a 2L, 5L small short path distillation unit, its short path distillation elbow is more susceptible to damage. The separation can protect the buy short path distillation kit from damage.
Principle of 10 liter Short path distillation
Conventional distillation utilizes the difference in boiling point for separation, while molecular distillation technology uses the difference in the mean free path of different molecules in the mixture components to separate by heating the liquid molecules under the condition of high vacuum (0.1-1.0Pa). At a certain temperature, the lower the pressure, the greater the mean free path of the gas molecules. The principle of molecular distillation is to set a condensation surface at a place greater than the free path of heavy molecules but less than the free path of light molecules so that light molecules are continuously condensed on the condensation surface. On the surface, heavy molecules are distilled along the evaporation surface because they cannot reach the condensation surface, thereby separating the light and heavy components.
Advantages of 10 liter Short path distillation
It can be known from the principle of molecular distillation that it is a continuous irreversible distillation process under a high vacuum, and this feature determines that it has significant advantages over conventional distillation.
3.1 Buy short path distillation low separation temperature Ordinary distillation needs to be carried out at the boiling point temperature of the material, while molecular distillation is based on the different properties of the mean free path of different types of molecules after escaping the liquid surface. Therefore, molecular distillation can be carried out below the boiling point of the material. It is the essential difference between molecular distillation and conventional distillation. The separated materials can be separated as long as there is a temperature difference. Since the separation temperature is much lower than the boiling point of the substance, molecular distillation can effectively avoid the thermal decomposition of the separated substance, and the efficiency is high.
3.2 The buy short path distillation pressure is small and the vacuum degree is high. Due to the special structure of the molecular distillation equipment, the vacuum degree in the system is high and the pressure is less than 1Pa. According to Clausius Clapeyronrelation, the reduction of the pressure further reduces the distillation temperature, thus effectively avoiding the oxidation of easily oxidizable substances. break down. In addition, molecular distillation is much more effective than conventional distillation for the removal of low molecular substances (such as organic solvents, odor substances, etc .) in the mixed liquid. Ordinary vacuum distillation is generally hundreds to thousands of Pa, which is not conducive to reducing the distillation temperature. It can be seen from the free path formula of molecular motion in Section 2.1 that to obtain a sufficiently large mean free path, can be obtained by reducing the distillation pressure P, which is generally in the order of 10-1Pa.
3.3 Short path distillation short heating time, The distance between the heating surface and the condensation surface of the molecular distillation device is less than the mean free path of light molecules, and the light molecules escaping from the liquid surface reach the condensation surface almost without collision, so the heating time is very short. In addition, the thickness of the liquid film of the material is about 0.25 to 0.5 mm, so that the area of the liquid surface and the heating surface is almost equal so that the heating time of the material during the distillation process becomes shorter, generally between a few seconds to tens of seconds, which can be very It protects the color and natural quality of the material well. Due to the low temperature and short heating time of molecular distillation, it is very suitable for the effective separation of high boiling point, heat sensitive and easily oxidizable materials.
3.4 Components with a high degree of separation have higher relative volatility than conventional distillation under molecular distillation conditions, so molecular distillation can separate components that cannot be separated by conventional evaporation and distillation, while for components that can be separated by conventional distillation, molecular distillation has higher efficiency. Molecular distillation is often used to separate liquid mixtures that are difficult to achieve by conventional distillation. For the separation of mixtures with similar vapor pressures, the advantages of molecular distillation are far greater than those of conventional methods.
3.5 Irreversible Ordinary distillation is a reversible process of evaporation and condensation, and a state of mutual equilibrium can be formed between the liquid phase and the gas phase. In the process of molecular distillation, the molecules escaping from the surface evaporation fly directly to the condensation surface. In theory, this process does not collide with other molecules, and there is no possibility of returning to the evaporation surface, so molecular distillation is irreversible.
3.6 Buy short path distillation no boiling and bubbling phenomenon Common distillation has bubbling and boiling phenomenon, while molecular distillation is free evaporation on the surface of the liquid layer, carried out under low pressure, and there is no dissolved air in the liquid. Therefore, in the process of molecular distillation, the whole liquid does not boil, and no bubbling phenomenon occurs.
3.7 Process cleaning and environmental protection Molecular distillation is a purely physical separation process, non-toxic, harmless, and free of residual pollution. It is a green and environmentally friendly production process, which can obtain pure and safe products and can ensure the pure naturalness of the extract. Quality is worth promoting. At the same time, the molecular distillation operation process is simple and the equipment is few. It is precise because of the many advantages of molecular distillation that it is widely used in the separation and purification of food and drug mixtures, and in the purification and separation of food additives, petroleum, oil, natural vitamins and natural pigments, and many other fields. realize industrialization.
