Introduction

Molecular distillation is a distillation process that operates in a high vacuum,In this case, the average free path of vapor molecules is greater than the distance between the evaporation surface and the condensation surface, so the difference in the evaporation rate of each component in the feed liquid can be used to separate the liquid mixture

At a given temperature, the lower the pressure, the greater the average free path of the gas molecules, When the pressure of evaporation space is very low (10-2 ~10-4 mmHg), and the condensation surface is close to the evaporation surface, and the vertical distance between them is less than the average free path of gas molecules, the vapor molecules vaporized from the evaporation surface can directly reach the condensation surface and condense without colliding with other molecules

1. Low distillation temperature. Molecular distillation is operated at a temperature far below the boiling point, and separation can be achieved as long as there is a temperature difference.This is the essential difference between molecular distillation and conventional distillation.

2. High vacuum degree of distillation, molecular distillation device can obtain high vacuum degree inside. Molecular distillation usually operates at very low pressures, so the material is not susceptible to oxidation damage.

3. Thin film of distillation liquid, high heat transfer efficiency.

4. The material is heated for a short time, and the distance between the heated liquid surface and the condensation surface is less than the average free path of light molecules, so the light molecules escaping from the liquid surface almost reach the condensation surface without collision. Therefore, the distillation material is heated for a short time, and the residence time at the distillation temperature is generally between a few seconds to tens of seconds, reducing the chance of thermal decomposition of the material.

5. Higher degree of separation, molecular distillation can separate substances that are not easily separated by conventional methods

6. Without boiling bubbling, molecular distillation is free evaporation on the surface of liquid layer. It is carried out at low pressure and there is no dissolved air in the liquid, so the whole liquid cannot boil during distillation and there is no bubbling.

7. Non-toxic, harmless, pollution-free, no residue, can get the pure and safe products, and the operation process is simple with less equipment. Molecular distillation can separate substances that are difficult to separate by conventional distillation.

8. Low energy consumption, due to the molecular distillation of the entire separation of overheating loss, and due to the unique structure of molecular distillation device, internal pressure is very low, internal resistance is far smaller than conventional distillation, so it can greatly save energy consumption

1. Molecular distillation provides the best separation method for the separation of high boiling point, heat sensitive and easily oxidized materials. Because molecular distillation operates at a temperature far below the boiling point of the material, and the residence time of the material is short;

2. Molecular distillation can effectively remove substances in the liquid such as organic solvents, odor, etc.;

3. Molecular distillation can selectively steam out the target product, remove other impurities, and separate more than two kinds of substances at the same time through multistage separation;

4. The fractionation process of molecular distillation is a physical process, so it can well protect the separated substances from pollution and damage.