Molecular distillation technology is a specialized liquid-liquid separation technique that emerged in the 1920s. It gradually rose to prominence as a result of the in-depth study of gas movement theory under vacuum conditions and the continuous advancement of vacuum distillation technology.

Currently, molecular distillation technology has become an important branch of separation techniques. The molecular distillation apparatus, also known as short-path distillation apparatus, is an instrument for a continuous distillation process carried out under high vacuum conditions (residual gas pressure < 0.1 Pa). The molecular distillation process differs from the traditional distillation process in that...

Traditional distillation involves separation at the boiling point, where evaporation and condensation are reversible, and a balance is formed between the liquid and vapor phases. Molecular distillation is an irreversible process that takes place at temperatures well below the substance's atmospheric pressure boiling point. Specifically,

It is the process of molecular evaporation. (1) Average free path of molecular motion. Any molecule's free path changes continuously during its motion. The average free path is the average of the free paths within a short time interval in a molecular distillation apparatus. Let Vm be the average velocity of a molecule.

f is the collision frequency, λm is the mean free path. Therefore, λm = Vm/f, and thus f = Vm/λm. (2) Separation Factor: Langmuir studied the evaporation phenomenon of pure substances under high vacuum, and theoretically derived that the molecular evaporation rate of pure substances is compared to normal distillation.

The theoretical separation factor in molecular distillation has increased by a factor of (MB/MA)^(1/2), thus, molecular distillation technology can be used to separate mixtures with similar volatilities but different molecular weights. (3) Basic Principle of Molecular Distillation. According to the formula for the average free path of molecular motion,

Different types of molecules, due to varying effective diameters, exhibit different average free paths, meaning they are distinct types of molecules.

Application Fields

Fine Chemicals: Purification of essential oils, purification of polymer intermediates, extraction of wool fat, etc.

Medical field: such as extraction of natural vitamins, preparation of derivatives of amino acids and glucose, etc.

Food Industry: Refined fish oil, acid removal from oils, refined high carbon alcohols, separation of mixed oils, etc.

Other Sectors: Oil Industry, Daily Chemicals, Environmental Protection, etc.

Key Features

Operate below the boiling point of the raw materials, with a short residence time; beneficial for the separation of high-boiling, heat-sensitive, and easily oxidizable materials.

2. Effectively removes substances from liquids such as solvents and odors, which is a highly effective method for desolventizing liquids after solvent extraction.

3. Optionally, volatile products can be evaporated and other impurities removed, allowing for the simultaneous separation of two or more substances through multi-stage separation.

4. High vacuum distillation, vacuum degree can reach below 0.1Pa, achieving a high vacuum internally; typically, molecular distillation is conducted under very low pressure.

Perform the operation, so the material is not prone to oxidation and damage.

5. The distillate film is thin with good thermal conductivity, with a film thickness less than 0.5mm.

6. High separation degree; molecular distillation can separate substances that are conventionally difficult to separate.

7. No boiling or bubbling occurs; molecular distillation is a free evaporation at the liquid surface, conducted under low pressure. There is no dissolved air in the liquid, therefore

No entire liquid boiling or bubbling should occur during the distillation process.

8. Offer a variety of specifications for customer selection, suitable for small-scale and pilot tests. Custom sizes for larger evaporation area are available upon customer request.

9. Physical separation method - non-toxic, harmless, pollution-free, with no residues, yielding pure and safe products

9. The scraper system is made of PTFE material and SS316L stainless steel, featuring *corrosion-resistant properties.

10. The feeding tank options include a preheating function, with adjustable preheating temperature.

11. Sealing is achieved using fluororubber gaskets, ensuring excellent airtightness. If corrosion resistance is required, they can be replaced with Teflon material upon customer request.

Product Specifications