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The principle and application of scraper film evaporator
Date: 2024-11-26Read: 5
Scraper film evaporator is a commonly used equipment for preparing high-purity compounds or separating mixtures, widely used in chemical, pharmaceutical, food, environmental protection and other fields.
The process principle of scraper film evaporator:
A scraper film evaporator is a device that disperses a liquid film into a thin film, and then heats and evaporates it on a scraper. The main principle is to pass superheated steam or heat exchange medium through the flow rate of the evaporator into its shell, and then transport it to the plate through transfer pipes or conduits. At this point, the liquid substance is evenly dispersed on the scraper, forming a liquid film.
During the heating process on the scraper, compounds in the liquid film begin to evaporate, and their vapor is negligible compared to the volume of the heating medium. This can maximize the concentration of liquid components, control their mass ratios, and achieve the best separation effect. At this point, due to the faster diffusion rate of substance molecules into the vapor phase than the diffusion rate of molecules in the refluxed liquid phase back into the liquid phase, control over fractionation can be achieved.
This heating method simultaneously eliminates the problem of liquid-phase molecules being fixed on the container wall. In addition, due to the cyclic motion of the liquid film, the surface area of the scraper is greatly increased, allowing for more efficient evaporation and separation of liquids.
Scraper film evaporator is suitable for industries such as chemical, pharmaceutical, and food that require fine processing and separation of raw materials, which are usually organic solvents and thermosensitive mixtures. The specific scope of application includes but is not limited to:
1. Separating hydrocarbon substances, such as petroleum, natural gas, and char, can efficiently and accurately separate various hydrocarbon substances;
2. To prepare high-purity compounds, the raw materials can be separated into various components and then synthesized into pure compounds;
3. Production of organic compounds, such as separation of carbon tetrachloride and methane chloride.
