Performance characteristics:
Low 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 a typical evaporator, this pressure drop is often quite high, sometimes even too high to be acceptable. However, the scraper type thin film evaporator has a large gas passage space, and the pressure inside the evaporator can be considered almost equal to the pressure in the condenser. Therefore, the pressure drop is very small, and the vacuum can reach 5mmHg.
Low operating temperature:
Due to the above characteristics, the evaporation process can be maintained under high vacuum conditions. Due to the increase in vacuum degree, the corresponding boiling point of the material rapidly decreases, so the operation can be carried out at lower temperatures, reducing 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, which makes the residence time of the material in the evaporator very short; In addition, the high-speed turbulence of the thin film on the heated evaporator prevents the product from remaining on the surface of the evaporator. Therefore, it is suitable for the evaporation of thermosensitive materials.
High evaporation intensity:
The decrease in boiling point of materials increases the temperature difference between the same heat medium; The function of the scraper reduces the thickness of the turbulent liquid film and lowers the thermal resistance. At the same time, during this process, the material is suppressed from forming walls and scaling on the heating surface, accompanied by good heat exchange, thus improving the overall heat transfer coefficient of the scraper type thin film evaporator.
High operational flexibility:
It is precisely because of the performance of the scraper type thin film evaporator that it is suitable for processing materials that are sensitive to heat and require smooth evaporation, high viscosity, and materials with a sharp increase in viscosity with increasing concentration. Its evaporation process can also evaporate smoothly. It can also be successfully applied to the evaporation and distillation of materials containing polymerization, scaling, and other conditions.