Falling Film Evaporator



Falling Film
Evaporator Operation

Falling Film evaporators offer distinct operating advantages in the concentration of many materials, such as certain food products, fruit juices, pharmaceuticals and similar materials, which are particularly suited to evaporation in this type of equipment.

The operation of BUFLOVAK Falling Film evaporators embodies a different operating principle from other types. The dilute liquid is fed to the top of the tubes, flows downward as evaporation occurs. 

Uniform distribution of the liquid to the tubes is assured by an exclusive feature which controls the flow of the liquid to the top of the vertical heating tubes. The liquid flows over the edge of the tubes and runs down the inside surface in a thin, uniform film. The vapor travels down the tubes in the same direction as the liquid, gaining in velocity by the addition of more vapor as the mixture descends, resulting in high velocity for both the liquid and vapor.

Falling Film
Evaporator Characteristics

  • Flexible in operation, permitting continuous or batch operation.
  • Very suitable for multiple effects.
  • Simplicity of construction permits economical use of corrosion resistant materials.
  • Handles liquids which increase in viscosity at higher concentrations because the liquid flows as a thin film down the surface of the heating tubes.
  • Vaporizes viscous materials more readily than a natural circulation evaporation as vaporization takes place from a thin film.
  • Can be used advantageously with Thermal Recompression.
  • Low power requirements.
  • Low holding volume.
  • Can be configured as a counter current falling film for stripping application.


Falling Film Evaporator
Product Application

  • Liquids too viscous for natural circulation.

  • Liquids where retention time must be minimized.

  • Heat-sensitive liquids or when excess temperature is critical.

  • Liquids requiring limited temperature difference.


Falling Film Evaporator
Application Examples

Caustic Soda 

Pectin Solutions


Fruit Juices


Corn Steepwater


and similar products

     Single Pass Falling
     Film Evaporator

Recommended for low
      concentration ratios


For information please contact: TMurray@Buflovak.com