What are the main advantages of short path distillation?
From the above characteristics of short path distillation technology, it is clear that it has the following obvious advantages over conventional distillation technology in the actual industrial application:
1, for the separation of high boiling point, heat-sensitive and peroxide material, short path distillation provides a separation method. Because short path distillation operates at temperatures well below the boiling point of the material, and the material residence time is short;
2, short path distillation can be extremely effective in removing substances in the liquid such as organic solvents, odors, etc., which is a very effective method for the use of solvent extraction of the liquid after the desolvation;
3, short path distillation can selectively evaporate the product of the purpose, remove other impurities, through multi-stage separation can be separated at the same time more than 2 kinds of substances;
4, short path distillation of the fractionation process is a physical process, and thus can be well protected from contamination and infringement of the separated substances.
Short path distillation is also known as molecular distillation, it is a relatively new liquid-liquid separation technology that has not been widely used in industrial production, its application can solve a large number of conventional distillation technology can not solve the problem.
A complete set of short path distillation equipment mainly includes: short path evaporator, degassing system, feeding system, heating system, cooling vacuum system and control system.
The core part of the short path distillation device is the short path evaporator, which has three main types: (1) falling film type: for the early form, simple structure, but due to the liquid film thick, poor efficiency, few countries in the world today; (2) scraping film type: the formation of liquid film thin, high separation efficiency, but more complex than the falling film type structure; (3) centrifugal type: centrifugal force into the film, thin film, high evaporation efficiency, but the structure is complex, vacuum sealing More difficult, the manufacturing cost of equipment is high. In order to improve the separation efficiency, it is often necessary to use multiple stages in series to achieve multi-stage separation of different substances.