Rising Falling Film Evaporator

Rising Falling Film Evaporator Product Operation

The Buflovak Risking Falling Evaporator or Concentrator delivers high tube velocities which assures 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 Characteristics

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 solids.

Readily handles thixotropic materials.


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

        Recirculating Rising Falling Evaporator (RRFC)



       Rising Falling Evaporator (RFC)