Falling Film Evaporator

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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



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

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