Performance characteristics of thin film evaporator

Small vacuum pressure drop:

The vaporized gas of the material is sent from the heating surface to the external condenser, and there is a certain pressure difference. In general evaporators, this pressure drop is usually relatively high, sometimes even unacceptably high. The scraped film evaporator has a large space for gas to pass through, and the pressure in the evaporator can be regarded as almost equal to the pressure in the condenser. Therefore, the pressure drop is very small, and the vacuum degree can reach 5mmHg.

Low operating temperature:

Due to the above characteristics, this allows the evaporation process to be carried out under high vacuum conditions. As the degree of vacuum increases, the boiling point of the corresponding material decreases rapidly, so the operation can be carried out at a lower temperature, which reduces the thermal decomposition of the product.

Short heating time:

Due to the unique structure of the scraper type thin film evaporator, the scraper has a pumping effect, so that the residence time of the material in the evaporator is very short; in addition, due to the high-speed turbulence of the film on the heated evaporator, the product will not stay in the evaporation device surface. Therefore, it is especially suitable for the evaporation of heat-sensitive materials.

High evaporation strength:

The reduction of the boiling point of the material increases the temperature difference with the heat medium; the function of the film wiper reduces the thickness of the liquid film in a turbulent state and reduces the thermal resistance. At the same time, in this process, the wall formation and fouling of the material on the heating surface are inhibited, accompanied by good heat exchange, so the total heat transfer coefficient of the scraped film evaporator is improved.

Great operating flexibility:

It is precisely because of the unique performance of the scraper type thin film evaporator that it is suitable for processing materials that are heat sensitive and require smooth evaporation, high viscosity, and materials whose viscosity increases sharply with the increase of concentration, and the evaporation process can also evaporate smoothly. It can also be successfully applied to the evaporation and distillation of materials containing solid particles, crystallization, polymerization, scaling, etc.

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