Multi-stage Evaporation Plants

Level by level halved energy requirement

In multi-stage evaporation, the vapor 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:

  • Fallfilm – Mehrstufeneindampfung
    • Platte
    • Röhre
  • Zwangs- und Naturumlauf – Mehrstufeneindampfung
  • Steigfilm – Mehrstufeneindampfung


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)
  • Energyconsumption can be optimized on a customer-specific basis
  • Energycosts can be signific reduced by using Multiple stages
  • Multi-stage evaporation plants can be used for a very wide range of applications 
  • Substances with high boiling Point increases can be evaporated
  • Very high condensate purities can be realized by using secondary heating surfaces




Multi-stage evaporation is 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 live steam, the subsequent stages of the Brüdendampf the previous stage is used to heat the heating surfaces. With an increasing number of stages, so the use of live 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. In Addition the circuit concept plays an essential role in finding the optimal design of the System.

Evaporation Technology

Andreas Schnitzhofer
Head of Business Unit
Aichhorn Wolfgang, Eindampftechnology, Evaporation Technology

Wolfgang Aichhorn
Sales Manager