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Short Path Evaporator

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KEP’s short path evaporator is an alternative & economical solution for high vacuum distillation/ fractionation. KEP has developed short path evaporation technology with innovation and revelation at an optimized Capital & Operating Cost. Short path evaporation is a thermal separation technique that provides minimum pressure drop, permitting high vacuum operation down to 0.001 mbar. Short path evaporation is excellent for gently processing heat sensitive, high boiling products.

Operating Principle of Short Path Evaporator:

  • The Short Path Evaporator operates in principle similar to a high performance Thin Film Evaporator.
  • The main difference is that the vapor chamber is additionally equipped with a built-in internal condenser, which results in an extremely short distance between the heating surface and the condensing surface, thus minimizing the pressure drop.
  • It has high vacuum capability hence reducing operating temperature, excellent mass and heat transfer and handles viscous fluids.
  • The Short Path Evaporator consists basically, of a cylindrical body with a heating jacket, a rotor and condenser inside.
  • The feed enters the unit at top and get distributed into a thin film on the inside surface of shell.
  • Heating medium passing through the jacket evaporates volatile component in feed. The vapor generated flow across the rotor and will condense on internal condenser. This short path of vapor eliminate pressure drop.
  • Hence evaporation can be done at high vacuum as 0.001 mbar (a). The distilled product and balance bottoms are taken out through separate outlets.


Suitable for viscous products.

Excellent turn down capability.

Low product holdup, good for hazardous materials.

Low power requirements.

Residence time of few seconds, important for heat sensitive products.

Operation pressure as low as 0.001 mbar (a). Hence production can be distilled at lower temperatures to avoid degradation.