Evaporation is a widely utilised process in many different industries, from food and beverage production to the production of chemicals and pharmaceuticals. The agitated film evaporator (AFE) is a cutting-edge and effective evaporation technique. Due to its remarkable thermal efficiency and versatility in handling a variety of materials, this technique has become more well-known. The Agitated Film Evaporator’s complexities will be examined in detail in this article, along with its benefits and uses in many sectors.

The Agitated Film Evaporator: An Overview

A specialised kind of evaporator called an agitated film evaporator is created to enable accurate and efficient evaporation of liquid substances. It works by forming a thin film of the liquid that has to evaporate, which is then heated under control to promote the phase change from liquid to vapour.

Important Elements of Agitated Film Evaporator:

  1. Vertical Tube: The AFE’s central component is a vertical tube that contains a rotating shaft. The liquid is dispersed as a thin layer inside this tube.
  2. Rotor: A rotor is attached to the rotating shaft inside the tube. The rotor stirs up the liquid coating, guaranteeing even liquid distribution and avoiding fouling or scaling on the inner side of the tube.
  3. Heating Jacket: A heating jacket is positioned around the vertical tube. The heat required for vaporisation is conveyed through this jacket using steam or hot oil.
  4. Vapour Outlet: To catch the substance that has vaporised, there is a vapour outlet at the top of the evaporator.
  5. Liquid Inlet and Outlet: The concentrated liquid or residue is collected at the bottom, while liquid is injected at the top and flows down as a thin film.

Operating Guidelines

The following stages can be used to summarise how an agitated film evaporator works:

  1. Introduction of Liquid: The system’s liquid input is used to introduce the liquid that will be evaporated.
  2. Formation of Thin Film: As the liquid travels down the vertical tube, the revolving rotor spreads it out into a thin film. The amount of surface area accessible for evaporation is increased by this thin coating.
  3. Heating: The liquid film is heated by the heating jacket that surrounds the tube. The liquid turns into vapour as a result of the heat.
  4. Separation: Through the vapour exit, the vapour is collected as it rises to the top of the evaporator. The liquid outlet is used to drain any concentrated liquid or residue that accumulates at the bottom.

Agitated film evaporators’ benefits

  1. High Efficiency: Due to the huge surface area of the thin film and effective heat transfer, AFEs are renowned for their superior thermal efficiency.
  2. Variability: These evaporators are versatile in a variety of industries because they can handle a wide range of materials, including highly viscous solids and heat-sensitive compounds.
  3. Exact management: AFEs provide exact changes for temperature and pressure management, enabling the achievement of targeted evaporation rates and product quality.
  4. Minimum Fouling: The liquid film is continuously stirred, minimising fouling and scaling on the tube’s surface and lowering maintenance needs.


agitated movie Evaporators are used in a variety of industries, including:

  1. Pharmaceuticals: Active pharmaceutical ingredients (APIs) are concentrated using AFEs to create high-purity intermediates. ethanol solvent recovery
  2. Chemicals: They are used to concentrate chemical solutions and recover solvents from them.
  3. Food and Beverage: Fruit juices, dairy products, and the concentration of flavourings and extracts can all be made using AFEs.
  4. Environmental: AFEs are used to concentrate and recover important components during wastewater treatment.


A wonderful piece of machinery, the agitated film evaporator has completely changed how evaporation is done in many different industries. It is a useful asset for firms trying to optimise their operations since it can handle a wide variety of materials while providing high efficiency and accurate control. Future developments and uses for this adaptable evaporator can be anticipated as technology develops further.