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SS Molecular distillation

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Short path molecular distillation

.Product description

Separation technology is one of the three major technologies in chemical production. The quality of the separation process has a great impact on product quality, efficiency, consumption, and benefits. High-efficiency rotating film evaporator is a device that separates according to the volatility of materials. The equipment has high heat transfer coefficient, low evaporation temperature, short material residence time, high thermal efficiency and large evaporation intensity. In petrochemical, fine chemical, pesticide, food, pharmaceutical, biochemical and other industries, it is widely used in evaporation, concentration, desolvation, purification, stripping, degassing, deodorization and other processes.

Molecular distillation is a distillation method which is operated under high vacuum, at this time, the average free path of the vapor molecules is greater than the distance between the evaporation surface and the condensation surface, therefore, the difference in evaporation rate of each component in the feed liquid can be used to separate the liquid mixture.

Molecular distillation is a kind of special liquid-liquid separation technology, which is different from that of traditional distillation.

When the liquid mixture flows along the heating plate and is heated, light and heavy molecules will escape the liquid surface and enter the gas phase. Due to the different free paths of light and heavy molecules, the molecules of different substances will move at different distances after they escape from the liquid surface. If a condensation plate can be set up properly, light molecules reach the condensation plate and are condensed and discharged, while heavy molecules cannot reach the condensation plate and are discharged along the mixed liquid. In this way, the purpose of material separation is achieved.


The pressure difference between the boiling film and the condensing surface is the driving force of the steam flow direction, and a small pressure drop will cause the steam flow. Operating at 1mbar requires a very short distance between the boiling surface and the condensing surface. A distiller based on this principle is called a short path distiller. The short-path still (molecular distillation) has a built-in condenser opposite the heating surface and reduces the operating pressure to 0.001 mbar.

Its low boiling temperature is very suitable for thermal sensitivity, high boiling point, and separation and purification of easy oxide materials. Its basic structure: a cylindrical barrel with a heating jacket, a rotor and a built-in condenser; a fixed wiper and an anti-splash device are accurately mounted 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. A suitable type of scraper is selected according to different material characteristics.


. Molecular distillation advantages

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

  1. For the separation of high boiling point, heat sensitive and easy oxide materials, molecular distillation provides the best separation method. Because molecular distillation is operated at a temperature far below the boiling point of the material, and the material residence time is short;
  2. Molecular distillation can very effectively remove substances in liquids such as organic solvents, odors, etc., which is a very effective method for liquid dissolution after solvent extraction;
  3. Molecular distillation can selectively evaporate the target product, remove other impurities, and can separate more than two substances at the same time through multi-stage separation;
  4. The molecular distillation fractionation process is a physical process, so it can well protect the separated materials from pollution and damage.
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