Rising Film Evaporator

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Simple solution for concentration of liquids that are moderately heat sensitive

A Rising Film Evaporator (RFE) 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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Rising Film Image

FEATURES

  • Thermosiphon action eliminates the need for circulation pump
  • Trace quantities of suspended particles in the feed are tolerated
  • Can operate under reasonable vacuum
  • Multiple effect arrangement provides steam economy

APPLICATIONS

  • Concentration of dilute solutions such as plant extracts
  • As a reboiler to distillation column
  • Economical alternative to falling film evaporator for moderate vacuum

RISING FILM EVAPORATOR

CASE STUDIES

RFE img
Using a Rising Film Evaporator for pre-concentration and a Thin Film Evaporator as stripper to reduce solvent loss and improve product quality
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Application Brief

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Product Details

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Bottoms or concentrate




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