Small molecular distillation equipment manufacturer

Small molecular distillation equipmentintroduction

Molecular distillation is a distillation method operated under high vacuum, in which the average free path of vapor molecules is greater than the distance between the evaporation surface and the condensation surface, allowing for the separation of liquid mixtures by utilizing the differences in evaporation rates of various components in the liquid.

Definition of Molecular Distillation

At a certain temperature, the lower the pressure, the larger the average free path of gas molecules. When the pressure in the evaporation space is very low (10-10mmHg) and the condensation surface is close to the evaporation surface with a vertical distance smaller than the average free path of gas molecules, the evaporated molecules from the evaporation surface can directly reach the condensation surface and condense without colliding with other molecules.

Small molecular distillation equipmentThe working principle of

Molecular distillation is a special liquid-liquid separation technique that differs from traditional distillation in that it relies on the principle of boiling point difference for separation. Instead, it achieves separation by the difference in the average free path of molecular motion of different substances.

When a liquid mixture flows along a heating plate and is heated, 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 movement distance of molecules of different substances after escaping from the liquid surface is different. If a condensation plate is properly set up, light molecules can be condensed and discharged when they reach the condensation plate, while heavy molecules cannot reach the condensation plate and are discharged along the mixed liquid. In this way, the goal of material separation is achieved. The pressure difference between the boiling film and the condensation surface of the molecular distillation equipment is the driving force for the flow of steam. For small pressure drops, steam flow can occur. Operating at 1mbar requires a very short distance between the boiling surface and the condensation surface. A distiller made based on this principle is called a short-range distiller. The short-range distiller (molecular distillation) has a built-in condenser opposite the heating surface and operates at a pressure of 0.001mbar

The short-range distiller is a thermal separation technology process that operates at a pressure of 1~0.001mbar. Its lower boiling temperature is very suitable for thermosensitive and high boiling point substances. Its basic components include a cylindrical body with a heating jacket, a rotor, and an internal condenser; Accurately install a scraper and anti splash device on the fixed bracket of the rotor. The built-in condenser is located at the center of the evaporator, and the rotor rotates between the cylindrical body and the condenser.

The short-range distiller is depicted by a vertically heated cylindrical body, a central condenser located at its center, and a scraper rotating between the distiller and condenser.

Advantages of molecular distillation

1. The distillation temperature is low, and molecular distillation operates at temperatures far below the boiling point. As long as there is a temperature difference, separation can be achieved. This is the essential difference between molecular distillation and conventional distillation.

2. The distillation vacuum degree is high, and the molecular distillation device can obtain a very high vacuum degree inside. Molecular distillation is usually operated at very low pressure, so the material is not easily oxidized and damaged.

3. Distilled liquid film is thin and has high heat transfer efficiency.

4. The heating time of the material is short, and the distance between the heated liquid surface and the condensation surface is less than the average free path of light molecules. Therefore, light molecules escaping from the liquid surface almost reach the condensation surface 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 to tens of seconds, reducing the chance of thermal decomposition of the material.

5. The degree of separation is higher, and molecular distillation can separate substances that are not easily separated by conventional methods.

6. There is no boiling or bubbling phenomenon. Molecular distillation is a free evaporation on the surface of the liquid layer, carried out at low pressure, and there is no dissolved air in the liquid. Therefore, the entire liquid cannot be boiled during the distillation process, and there is no bubbling phenomenon.

7. Non toxic, harmless, pollution-free, residue free, pure and safe products can be obtained, and the operation process is simple with few equipment. Molecular distillation technology can separate substances that are difficult to separate by conventional distillation.

8. Molecular distillation equipment is expensive, and the molecular distillation device must ensure a high vacuum degree of the system pressure, with high requirements for material sealing. The distance between the evaporation surface and the condensation surface is moderate, making equipment processing difficult and costly.

9. The product has low energy consumption. Due to the low losses in the entire separation process of molecular distillation, and the structural form of the molecular distillation device, the internal pressure is extremely low, and the internal resistance is much smaller than that of conventional distillation, which can greatly save energy consumption.

Advantages of Molecular Distillation

From the above characteristics of molecular distillation technology, it can be seen that it has the following obvious advantages over conventional distillation technology in practical industrial applications:

1. Molecular distillation provides a separation method for high boiling point, thermosensitive, and easily oxidizable materials. Because molecular distillation operates at temperatures far below the boiling point of the material, and the residence time of the material is short:

2. Molecular distillation can effectively remove substances such as organic solvents, odors, etc. from liquids, which is a very effective method for solvent extraction and desolvation of liquids;

3. Molecular distillation can selectively distill the target product, remove other impurities, and separate two or more substances simultaneously through multi-stage separation;

4. The fractionation process of molecular distillation is a physical process, which can effectively protect the separated substances from contamination and damage.

The process of molecular distillation

The material is added from the top of the evaporator and distributed continuously and evenly on the heating surface through the material liquid distributor on the rotor. Then, the scraper scrapes the material liquid into a very thin, turbulent liquid film and pushes it downwards in a spiral shape. During this process, the light molecules escaping from the heating surface are condensed into liquid on the built-in condenser through a short path and almost no collision, and flow down the condenser tube. They are discharged through the discharge tube located at the bottom of the evaporator, and the residual liquid, i.e. heavy molecules, is collected in the circular channel below the heating zone and then flows out through the side discharge tube.

Molecular Distillation System

Using the working principle of molecular distillation, our YMD series short-range molecular distillation system is an efficient plant essential oil purification equipment used to obtain high-purity essential oils.

Optional Package Standard Edition

Optional package upgrade version

Composition of Molecular Distillation System Kit

Molecular Distillation Parameters: Type A

Molecular Distillation Parameters: Type B