Falling Film Evaporator

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Small holdup ensures quick response to changes in operating conditions, quick start-up and an easy switchover

A Falling Film Evaporator (FFE) is a vertical shell and tube heat exchanger with a vapor- liquid separator mounted at the bottom.
The liquid to be concentrated is fed at the top of the heated tubes and distributed in such a way that it flows down on the inside surface of the tubes as a thin film. As the film gets heated, the vapors generated flow co-currently. The drag of vapors increases the turbulence and improves heat transfer performance. The vapor and balance liquid are separated in the vapor- liquid separator.

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  • Suitable for heat sensitive products
  • Gentle evaporation with a short residence time in the evaporator
  • Can operate under reasonable vacuum
  • Multiple effect arrangement provides steam economy


  • Concentration of dilute solutions of heat sensitive products such as plant extracts
  • As a reboiler to a distillation column
  • Recovery of solvents from contaminants
  • Pre-concentration before ATFE or ATFD
  • Solvent recovery after extraction



Falling Film agro image
Using a Falling Film Evaporator with a Thin Film Evaporator to reduce energy and capital costs
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