Rising Falling Film Evaporator

Rising Falling Film Evaporator
Product Operation
The design features of the BUFLOVAK Rising Falling Evaporator or Concentrator (RFC)
produce high tube velocities and assure uniform product distribution and high coefficients of
heat transfer.

The rising falling film evaporator (RFC), or recirculating version, RRFC, works on uniform metered flow entering the bottom of the steamchest and rises through the first pass with
rapidly increasing velocity. After leaving the first pass the flow of the vapor liquid mixture is reversed and directed downward through the second pass at extremely high velocity. The mixture then enters the separator where the vapor and liquid are separated.

When not designed as a circulation unit, the rising falling film evaporator provides once through evaporation of heat-sensitive materials, requiring minimum retention time. It is particularly adaptable to multiple effect systems but provides a lesser turn-down capability than the RRFC configuration.

Rising Falling Film Evaporator

  • High tube velocity minimizes fouling.

  • Able to achieve high concentrations at low temperatures.

  • Risk of entrainment is greatly reduced since the major portion of the liquid passes directly
    out of steamchest rather than being re-entrained with vapor from 
    the separator.

  • System may be turned down without loss of efficiency or effectiveness.

  • Holding time is a matter of seconds (RFC).

  • Suitable for evaporation of a wide range of
    liquid concentrations.

  • Low headroom requirement.

Rising Falling Film Evaporator
Product Applications

  • Heat sensitive liquids requiring
    minimum process time.

  • Pure or non-crystal forming liquids.

  • Liquids having low to medium viscosities.

  • Foamy liquids.

  • Liquids containing fine suspended

  • Readily handles thixotropic

Rising Falling Film Evaporator Application Examples

Ammonium- Nitrate 

Apple Juice

Cane Sugar Syrup


Corn Syrup


Coffee Extracts



Grape Juice

Lemon Juice

Orange Juice

Pharmaceuticals, Heat-sensitive

Pineapple Juice

Tea Extracts

Urea and similar products

 For information please contact:  TMurray@buflovak.com