Multi-stage Evaporation Plants

Level by level halved energy requirement

In multi-stage evaporation, the vapor from the liquid medium is used to heat the subsequent stages. As a result, the use of primary steam can be significantly reduced and the plant can be operated cost-effectively and energy-efficiently.

GIG Karasek has been a leading supplier of the following concepts for years:

  • Fallingfilm – Multi Stage Evaporation

    • Plate
    • Tube
  • Forced and natural circulation – multi-stage evaporation

  • Rising film – multi-stage evaporation

Fields of Application


  • Concentration of Sulphite & sulphate lye
  • Concentration of pulp for pulp production for the regenerated fiber industry
  • Concentration of lignosulfonates
  • Concentration of  Xylose
  • Concentration of bleaching water
  • Recovery of Spinning bath Solutions from the fiber industry

General Application areas 

  • Recovery of solvents and Alcohols
  • Separation of water, solvents, alcohols and more
  • Recovery of recylables
  • Volumereduction of liquid-liquid-mixtures
  • Separation of multi-substance mixtures

Other industrial Applications

  • Starchindustry
  • Sugarindustry
  • Saltworks
  • Wastewater
  • Chemical Industry
  • Pharmaceutical Industry


  • Very high Evaporationcapacity possible (up to 500 t/h)
  • Individually optimized energy consumption
  • Reduction of energy costs by using several stages
  • Wide field of application of multi-stage evaporation systems
  • Ideal for mixtures with high boiling point increases
  • Very high condensate purities through the use of secondary heating surfaces



Multi-stage Evaporation plants are one of the most widely used processes for evaporation plants, especially with high evaporation capacities required. The principle is simple. It is the first stage heated with fresh steam, the subsequent stages use steam from the previous stage to heat the heating surfaces. With an increasing number of stages,  the use of fresh steam can be significantly reduced.

However, the number of stages can not be increased arbitrarily, since the maximum temperature gradient is usually predetermined. On the one hand, the temperature sensitivity of the medium and the maximum available heating steam pressure play a role and on the other hand, the cooling water temperature.

Thus, an optimum between energy and investment costs must be found, which is determined in close cooperation with the customer. An essential part is the the circuit concept in order to find the optimal design of every individual System.


GIG Karasek - AICHHORN Wolfgang

Sales Contact

Head of Sales
Thomas Gurker - GIG Karasek GmbH

Technical Contact

Evaporation Technology