Thin Film Evaporator

A carefully designed concept!

The technology of thin film evaporators includes all thermal methods. The typical wiped film evaporator consists of a tubular heat transfer area with an external heating jacket and an internal rotor system. The feed liquor is distributed evenly by a rotating system and its wipers over the heating surface forming a thin liquid film of uniform thickness < 1 mm. The liquid film flows down on a steam or thermal oil heated surface. GIGKarasek_Duennschichtverdampfer01

Versatile efficiency and application diversity.

The evaporator can be used for concentration, as well as for purification of valuable materials by distillation. It does its job successfully in:

  • Concentrating sensible products
  • Concentrating viscous fluids
  • Concentrating fluids with structural viscosity
  • Removing solvents from valuable products
  • Separating valuable products from heavy boiling components
  • Mass-transfer operations through the thin film
  • Special applications: reboiler for rectification column
  • Drying


Outstanding features

  1. According to the application and product characteristics, the optimal rotor-system will be selected.
  2. High evaporation rates  by a highly turbulent film and possible high temperature difference
  3. Short residence time: A small heating surface is being obtained by the high temperature difference and high heat tranfer rates. The rotor keeps the film in turbulence and thus it flows quickly downwards to the outlet. This results in a short contact time of the product with the heating surface.
  4. Gentle evaporation:  Thermal decomposition is being sufficiently avoided by the intensive exchange of liquor between evaporation surface and heating surface and by the low total residence time in the thin film evaporator.
  5. Sufficient heat transfer for viscous products and heavily contaminated media: The high rotor speed and the eddy-effect at the wiper ends cause higher turbulence even in case of viscous fluids. Where a higher turbulence cannot be obtained any more, heat transfer is being improved by the thin film and in special cases by forced flow type rotors.
  6. Concentrating products with tendency to foam:By reasons oft centrifugal forces in the distributor and those caused by the rotor itself, it is possible to concentrate foaming products. Fouling by product dried under bubbles formed at the heating surface is being avoided sufficiently.
  7. Efficient droplet separation
  8. Less need for maintenance through sophisticated bearings and sealings
  9. Shorter standstill and assembly time for maintenance and inspection jobs


Concentrated strength for even more power

The experts of GIG Karasek exactly know what it all depends on. GIG Karasek offers individual solutions. Whether special equipment or a complete plant, we design, manufacture and erect it to your particular needs. All interested parties, it is possible to carry out pilot experiments with sample material in our own R&D centre.

Do you have questions?

Ralph Scully

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