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Thin film evaporators have low operating temperatures and short heating times
- Mar 29, 2018 -

During the operation of the thin film evaporator, the vaporization gas of its material is directly sent from the heating surface to the external condenser, and there will be a certain pressure difference. In a general evaporator, such pressure will be usually higher. Scraper-type thin film evaporators have a large space for gas to pass through. The pressure in the evaporator can be seen as almost equal to the pressure in the condenser. Therefore, the pressure drop is small and the vacuum degree can reach 5 mmHg.

The operating temperature of the thin film evaporator is low, so that the evaporation process can be effectively maintained under a higher degree of vacuum. Due to the increase of the vacuum degree, the boiling point of the corresponding material will be rapidly reduced. Therefore, the operation can be performed at a lower temperature, reducing the thermal decomposition of the product.

The heating time of the thin film evaporator is short, and the film scraper of the equipment has a pumping effect to a certain extent, so that the time for the material to stay in the evaporator to a certain extent will be relatively short, due to the thin film on the heated evaporator. The high-speed turbulence allows the product to stay on the evaporator surface. Therefore, it is particularly suitable for the evaporation of heat-sensitive materials.

The evaporation intensity of the thin film evaporator is high, and the boiling point of the entire material is reduced. This will increase the temperature difference with the heat medium to a certain extent. The function of the film scraper reduces the liquid film that exhibits turbulent flow. Thickness reduces thermal resistance. At the same time, in the process, the material is inhibited from fouling on the heating surface, and fouling is accompanied by good heat exchange. Therefore, the overall heat transfer coefficient of the scraped film evaporator is increased.

The unique properties of the thin film evaporator make it suitable for the heat-sensitive and materials that require stable evaporation, high viscosity, and increased viscosity with a sharp increase in concentration. The evaporation process can also evaporate smoothly. It can also be successfully applied to evaporation and distillation of materials containing solid particles, crystallization, polymerization, scaling, and the like.