Agitated Thin Film Evaporator

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An Agitated Thin Film Evaporator (ATFE), also known as a Thin Film Evaporator (TFE) or Wiped Film Evaporator (WFE), comprises a jacketed shell that is precisely machined on the interior surface and a rotor with blades that maintain a minimal gap from the shell.

A feed distributor at the inlet ensures the liquid is evenly spread into a thin film over the heated wall. The high-speed rotor then enhances the distribution and provides vigorous agitation as the film moves downward. The resulting vapors flow in a counter current direction and are effectively separated from any entrained droplets by an integrated entrainment separator.

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Features

  • A retention time of just a few seconds with minimal variation is a crucial feature for processing heat-sensitive products.
  • Required evaporation is achieved in a single pass, eliminating the need for product recirculation and reducing the risk of degradation.
  • On the heat transfer surface, scale development is efficiently reduced by constant movement of the liquid film.
  • Operates at pressures as low as 1 mbar and temperatures up to 400°C
  • Minimal product hold-up, making it ideal for hazardous applications
  • Exceptional turn-down capability

Applications

  • Processing of plant extracts, oleoresins, enzymes, dairy products, juices, and sugars
  • Distillation of fine chemicals, bulk drugs, intermediates, glycols, used lubricating oils, fatty acids and their derivatives, monomers, pre-polymers, polymers, rubber chemicals, amines, and esters
  • Stripping of plasticizers, silicone oils, and pesticides
  • Recovery of products from residues
  • Recovery of contaminated solvents and materials from residues