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Rising Film Evaporator

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Rising Film Evaporator

Rising Film Evaporator Working Principle:

A rising film or vertical long tube evaporator is operating on a "thermo-siphon" principle. A Feed product (A) enters the bottom of the heating tubes and as it heats, steam begins to form. The ascending force of this steam produced during the boiling causes liquid and vapors to flow upwards in parallel flow. At same time the production of vapor increases and the product is pressed as a thin film on the walls of the tubes, and the liquid rises upwards.

This co-current upward movement against gravity has the beneficial effect of creating a high degree of turbulence in the liquid. This is advantageous during evaporation of highly viscous products and products that have a tendency to foul the heating surfaces.


  • Cost effective construction, ideal for simple evaporation, concentration applications
  • Ideal for volume reduction of dilute streams
  • Can be used under recirculation mode
  • Continuous operation
  • Good for moderately heat sensitive products
  • Can operate under vacuum
  • Multiple effect arrangement provides steam economy


  • Food & Dairy industry
  • Pharmaceutical industry
  • Agrochemical industry
  • Herbal industry