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How to choose a right molecular distillation or thin film evaporator?

2023-11-03
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Molecular distillation and thin film evaporators are both liquid-liquid separation equipment and are very similar in appearance. It is easy for purchasers to confuse them if they are not careful. So how to distinguish the two? How do their functions differ? What factors should you pay attention to when purchasing?

Differences.
Different working principle.
The thin film evaporator, like the rotary evaporator, is a long-range distillation, and the theoretical basis is the boiling point difference. That is, in a vacuum state, the material is spread by a scraper to accelerate the evaporation of light components in the material. The evaporated gas enters the condensation recovery device for condensation and recovery under the pressure of vacuum.



Molecular distillation is a short-path distillation, based on the mean free path difference of molecules. In a high vacuum state, the mean free path of vapor molecules is greater than the distance between the evaporation surface and the condensation surface, so that the difference in evaporation rate of each component in the feed liquid can be used to separate the liquid mixture.



Different structure.
1. The main evaporation chamber of the molecular distillation equipment has a built-in condenser, but the thin film evaporator does not;

2. The gas phase outlet of the thin film evaporator is at the upper end of the evaporator to meet the bottom-up flow pattern of the light component steam. On the contrary, the gas phase outlet of the molecular distillation is at the lower end of the evaporator. This is because the light component must be fully in the evaporator. Condensation takes place on the built-in condenser.

Different functions.
1. The vacuum degree of molecular distillation under operating conditions is higher than that of thin film evaporators, which gives room for lowering the operating temperature and is more conducive to the separation of heat-sensitive materials;

2. In the separation process using the boiling point difference, evaporation and condensation are reversible processes, and the liquid phase and the gas phase are in dynamic phase equilibrium; while in the molecular distillation process, the molecules escaping from the heating surface fly directly to the condensation surface, so There is no limit to it. Molecular distillation has higher separation accuracy than thin film evaporator;

3. In general, molecular distillation can perform experiments that can be performed with thin film evaporators, but thin film evaporators that can perform molecular distillation may not necessarily be suitable.

What factors need to pay attention to when purchasing one?
First of all, it is necessary to judge the needs of testing or production. If both can be met, the thin film evaporator has significant advantages in price and equipment maintenance; 

However, if there are special requirements for functionality that non-molecular distillation cannot meet, then the thin film evaporator will have significant advantages in price and equipment maintenance. Never choose the wrong equipment for the sake of cheapness, which will cause unnecessary losses to testing or production.

Applications.
Molecular distillation Thin film evaporator
Thermal Separation of Thermosensitive Compounds Degassing of precursor materials for molecular distillation
Purification of organic synthetic substances Concentration of heat-sensitive compounds
Separation of biological extracts Concentrated biological extract
Industrial waste recycling Industrial waste recycling
Removal of toxic substances in the food industry Removal of toxic substances in the food industry
Decolorizing and deodorizing organic compounds Decolorizing and deodorizing organic compounds
Precision removal of residual solvents Precision removal of residual solvents
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