Short Path Molecular Distillation Equipment

Short path molecular distillation equipment is widely used in the fields of petrochemical, food, medicine, flavor and fragrance fine chemicals, etc., especially in the separation and purification of natural products and heat-sensitive materials. In addition, there are natural pigments, natural vitamins, and natural volatile essential oils, all of which use short path molecular distillation equipment. In the field of petrochemical industry, it can be used for the refining treatment of synthetic lubricating oil base oil, as well as for oil product analysis, and it can be used in the field of deep drawing of vacuum distillate oil. In the field of medicine, it is used for the purification of drugs or intermediates.

Molecular distillation equipment is considered a safe and efficient separation method for the purification of poorly thermally stable molecules and associated low volatility, high boiling point compounds. It is characterized by high vacuum, low distillation temperature, short material heating time and fast separation speed. It is widely used in petrochemical, pharmaceutical and chemical industries, essential oil purification, cosmetics and perfume purification, etc.

Molecular distillation equipment is a distillation method that operates under high vacuum. At this time, the mean free path of vapor molecules is greater than the distance between the evaporation surface and the condensation surface, so the different evaporation rates of the components in the feed liquid can be used to separate the liquid mixture.

The Principle of Short Path Molecular Distillation Equipment:

As the liquid mixture flows along the heating plate and is heated, light and heavy molecules escape the liquid and become a gas. Light molecules and heavy molecules have different free paths, and different molecules move different distances after escaping from the liquid surface. A condensation plate is set in short path molecular distillation equipment. When light molecules reach the condensation plate, they are condensed and discharged, while heavy molecules cannot reach the condensation plate and The mixture is discharged together. In this way, the purpose of material separation can be achieved.

Model and Composition of Molecular Distillation Equipment:

Zhengzhou Keda is a manufacturer of short path molecular distillation equipment. Molecular distillation equipment is one of the main distillation products of our company. At present, we have six models, namely: YMD-060, YMD-80, YMD-100, YMD-150, YMD-200 , YMD-230.

A complete set of molecular distillation equipment mainly includes: molecular evaporator, degassing system, feeding system, heating system, cooling vacuum system and control system. There is also a cylindrical cylinder with a heating jacket, a rotor and a built-in condenser; a film wiper and an anti-splash device are precisely installed on the fixed frame of the rotor. The built-in condenser is located in the center of the evaporator, and the rotor rotates between the cylindrical barrel and the condenser. There are three main types of modern short path molecular distillation equipment: (1) falling film type: it is an early form with a simple structure, but due to the thick liquid film and poor efficiency, it is rarely used in countries around the world today; (2) scraping film type: the formed liquid film Thin, high separation efficiency, but more complex structure than falling film type; (3) Centrifugal type: centrifugal force film formation, thin film, high evaporation efficiency, but complex structure, difficult vacuum sealing, high manufacturing cost of equipment. In order to improve the separation efficiency, it is often necessary to use multiple stages in series to achieve multistage separation of different substances.

We are currently focusing on wiped film molecular distillation equipment. The feed liquid of the wiped film molecular distillation equipment flows through a heated cylindrical vacuum chamber, and the volatile components are separated from the less volatile components by the scraping effect of the feed liquid film. components are separated. The key outstanding advantages of this process are: short feed liquid residence time, perfect cooling according to high vacuum capability, optimum mixing and material and heat transfer efficiency. The result of this efficient thermal separation technology: minimal product decomposition and highest product quality.

Operation Steps of Short Path Molecular Distillation Equipment:

1. Install the injector (tighten the injector clockwise), the first, second, and third receiving bottles, and turn on the cooling water circulation button;

2. Open the wiper rotor and adjust to the specified speed (not exceeding 400 r/min);

3. Turn on the vacuum pump after the liquid nitrogen reaches the required liquid level (not less than 1/2 of the volume of the condensation column);

4. When the pressure no longer drops, adjust the vacuum pump fine-tuning valve (not lower than 0.5 mbar);

5. After the pressure is adjusted in place, turn the injector valve counterclockwise to adjust the injection speed;

6. During the operation of the equipment, feed liquid can be added at any time through the injector;

7. When the remaining liquid volume in the injector is about 50 ml and no more samples are injected, turn off the vacuum pump and turn back the fine-tuning valve. When the pressure reaches 1000 mbar, wait for 10 minutes. After the pressure is exhausted, turn off the heater and remove the Injector, pour out the remaining sample solution, and replace with absolute ethanol;

8. Replace the first and second receiving bottles, put in empty bottles, unscrew the injector, slowly inject absolute ethanol, and use the residual heat to clean the equipment;

9. After cleaning, turn off the cooling water and the rotor, remove the sampler and receiving bottle for another wash;

10. Turn off the power and clean the countertop.

Features of Short Path Molecular Distillation Equipment:

1. Distillation has high steam space. The important factor that the molecular distillation equipment apparatus can create a high vacuum system environment is that it has good sealing, and the internal pressure can be reduced to below 0.1Pa.

2. Low distillation temperature. short path molecular distillation equipment separation utilizes the difference in the average free path of molecules, so the distillation temperature is much lower than the boiling point of raw materials, which solves the problem of heat sensitivity of high value-added chemicals.

3. High separation efficiency. Due to its irreversibility, the molecular distillation equipment process can separate materials that cannot be separated by ordinary distillation. This feature allows molecular distillation equipment technology to be applied in the fields of food and medicine that require high-purity products.

4. The heating time of the material is short. The film wiper of the molecular distillation equipment apparatus makes the material form a uniform film on the surface of the evaporator, increases the evaporation area, shortens the distillation time, reduces the probability of material being decomposed by heat for a long time, makes the separation more efficient, and saves time and cost.

Compared with Conventional Distillation, Short Path Molecular Distillation Equipment Has the Following Characteristics:

(1) The operating temperature is low, which can greatly save energy consumption

Conventional distillation relies on the difference in boiling points of different substances in the material mixture to separate, while molecular distillation equipment relies on the difference in the mean free path of molecular motion of different substances to separate. Separation can be achieved by volatilization in the medium. Just because the short path molecular distillation equipment is operated far away from the boiling point, the energy consumption of the product is small.

(2) The distillation pressure is low, requiring operation under high vacuum.

The mean free path of molecular motion is inversely proportional to the system pressure, and only by increasing the vacuum can a sufficiently large mean free path be obtained. Studies have pointed out that the vacuum degree of short path molecular distillation equipment is as high as 0.1-100Pa.

(3) The heating time is short, reducing the thermal damage of heat-sensitive substances.

Since molecular distillation equipment uses the difference in the mean free path of molecular motion of different substances to achieve separation, the basic requirement is that the distance between the heating surface and the condensing surface is smaller than the average free path of light molecules. This distance is usually very small, so light molecules are separated by liquid After the surface escapes, it hits the condensing surface almost without collision, so the heating time is extremely short. Studies have shown that the heating time of short path molecular distillation equipment is only a few seconds or tens of seconds, thus avoiding the decomposition or polymerization of substances to a large extent.

How to Improve the Effect of Short Path Molecular Distillation Equipment:

1. Diffusion of molecules from the main body of the liquid phase to the evaporation surface: Usually, the diffusion speed in the liquid phase is the main factor controlling the short path molecular distillation equipment speed, so the thickness of the liquid layer should be reduced as much as possible and the flow of the liquid layer should be strengthened.

2. Free evaporation of molecules on the surface of the liquid layer: the evaporation rate increases with the increase of temperature, but the separation factor sometimes decreases with the increase of temperature, so the thermal stability of the processed substance should be taken as the premise , choose an economical and reasonable distillation temperature.

3. Molecules flying from the evaporating surface to the condensing surface: During the process of flying from the evaporating surface to the condensing surface, the vapor molecules may collide with each other or collide with the remaining air molecules between the two surfaces. Because evaporated molecules are much heavier than air molecules, and most of them have the same direction of motion, their own collisions have little effect on the direction of flight and evaporation speed. The residual gas molecules are in a chaotic thermal motion state between the two sides, so the number of residual gas molecules is the main factor affecting the flying direction and evaporation speed.

4. Molecules condense on the condensing surface: as long as there is a sufficient temperature difference between the hot and cold sides (generally 70~100°C), and the form of the condensing surface is reasonable and smooth, the condensation step can be completed in an instant.

Precautions when Using Short Path Molecular Distillation Equipment:

The molecular distillation equipment instrument is an instrument that realizes liquid-liquid separation based on the difference in the mean free path of molecular motion of different substances. The design is compact and the footprint is small, but it is powerful. The product is cost-effective and widely used in petrochemical, pharmaceutical, food, essence, fragrance and other industries. It is easy to operate and reliable in performance. It can solve problems that cannot be solved by traditional distillation technology. During use, care should be taken to avoid instrument failure due to operational errors.

1. Strictly control the liquid level of each separator so that it is in the proper position required by the process.

2. When distilling easily crystallized materials, pipes, plate evaporators, valves and other parts are prone to fouling and blockage. Therefore, it is necessary to wash it with water regularly to keep it unblocked, or take measures such as a vacuum pump to remedy it.

3. The equipment and pipelines of the molecular still should be strictly inspected and tested frequently, especially the glass of the mirror should be checked and replaced in time to prevent accidents caused by corrosion.

4. Before equipment maintenance, the pressure and materials should be released, and rinsed and cooled with water to remove the residual corrosive liquid in the equipment.

5. Operators and maintenance personnel should wear protective clothing to avoid personal injury caused by hot liquid and steam.

6. Devices and instruments should be adjusted frequently to make them sensitive and reliable. If the instrument is found to be malfunctioning, the cause should be found in time and dealt with.

Why Choose Us

Professional extraction equipment manufacturer

Zhengzhou Keda Machinery Equipment Co., Ltd. is a family integrating production and trade. Our main product is laboratory extraction equipment. Supercritical extraction is one of our main products. Our short path molecular distillation equipment models are: YMD-060, YMD-80, YMD-100, YMD-150, YMD-200, YMD-230 can also be customized according to your needs. The company has been established for more than ten years and has provided equipment for tens of thousands of enterprises and individuals at home and abroad. The solution has won unanimous praise from domestic and foreign customers.

Fast delivery

We have warehouses in Los Angeles in the United States, Valencia in Spain, and Thailand. We can choose the nearest warehouse for delivery according to the customer's geographical location, ensuring that the customer receives the goods quickly.

Perfect after-sales team

We provide a one-year warranty service for the products we sell. We have a professional after-sales team to deal with customers' after-sales problems, and can provide corresponding technical guidance through videos and other methods.

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