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Molecular distillation is a special liquid liquid separation device

Date:2018/4/26Read:2136

The average free path of molecular distillation is greater than the distance between the evaporation surface and the condensed surface, and the liquid mixture can be separated by the difference between the evaporation rate and the evaporation rate. Molecular distillation must be achieved in a special design evaporator so that the average free range of the material steam molecules at this time is greater than the distance between the evaporation surface and the condensing surface at a specific vacuum, thus separating the liquid mixture by the difference in the evaporation rate of each component in the material. When the liquid mixture flows along the heating plate and is heated, the light and heavy molecules will escape from the liquid surface and enter the gas phase. Molecular distillation will be due to the different free course of its light and heavy molecules. In the process of operation, the molecules of different substances move from the liquid surface, and the moving distance is different. If a condensing plate can be properly set up, the light molecules reach the condensing plate to be condensed and discharged, and the heavy molecules can not reach the condensate. In molecular distillation, as the vaporizing molecules are much heavier than the air molecules, most of them have the same direction of motion to some extent, so their own collisions have little effect on the direction of the flying and the rate of evaporation. Residual molecules are in a state of chaotic motion on both sides, so the number of residual molecules is the main factor affecting the direction of flight and evaporation speed.

At a certain temperature, the lower the pressure of the molecular distillation is at a certain temperature, the greater the average free path of the gas molecules, the lower the pressure of the evaporation space during the operation, and the use of its condensation surface to a certain extent near the evaporation surface when the vertical distance between them is smaller than the average free path of the gas molecule. Vaporized molecules vaporized on the surface of vaporization do not collide with other molecules, directly reaching the condensing surface and condensing.

Molecular distillation is a special liquid liquid separation technology. In the process of operation, it is different from the principle of boiling point difference separation from traditional distillation. In the process of operation, the separation is realized mainly by the difference of the average free range of the movement of different material molecules. When the molecular distillation is running, when the liquid mixture flows along the heating plate effectively and is heated, the light and heavy molecules will escape the liquid surface and enter the gas phase. In the process of operation, the free range of the light and heavy molecules will be different. Therefore, the moving distance of the molecules of different substances is different after escaping from the liquid surface, and if it can be properly set up. When a condensing plate is placed, the light molecule reaches condensation plate to be condensed and discharged, while the heavy molecule can not reach the condensation plate and discharge along the mixed liquid. The pressure difference between the boiling film and the condensing surface is the driving force of the steam flow, and the small pressure drop will cause the steam flow. The operation under 1mbar requires a very short distance between the boiling surface and the condensing surface. The distiller based on this principle is called short distance distillation.

 

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