The complete molecular distillation equipment mainly includes: molecular evaporator, degassing system, feed system, heating system, cooling vacuum system and control system. There are three main types of molecular distillation devices

1. Centrifugal type: the film is formed by centrifugal force, the film is thin, and the evaporation efficiency is high, but the structure is complex, the vacuum sealing is difficult, and the manufacturing cost of the equipment is high. In order to improve the separation efficiency, it is often necessary to use multistage series to separate different substances. 2. Falling film type: it is an early form with simple structure. However, due to the thick liquid film and poor efficiency, it is rarely used in the world today;

3. Scraping membrane type: the formed liquid membrane is thin and has high separation efficiency, but its structure is more complex than that of falling membrane type;

Molecular distillation equipment, also known as short path distillation, is a relatively new liquid-liquid separation technology which has not been widely used in industrial production. Its application can solve the problems that cannot be solved by a large number of conventional distillation technologies. In high vacuum, the average free path of vapor molecules is larger than the distance between evaporation surface and condensation surface, so the liquid mixture can be separated by the difference of evaporation rate of each component in feed liquid.

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