Evaporation and Dehydration

The removal of water from foods provides microbiological stability, reduces deteriorative chemical reactions, and reduces transportation and storage costs. Both evaporation and dehydration are methods used in the dairy industry for this purpose. The following topics will be addressed here:


  • Principle of Operation
  • Evaporator designs
    • Batch Pan
    • Rising Film
    • Falling Film
    • Multiple Effect Evaporators
    • Thermo compression
    • Mechanical Vapour Recompression 


  • Spray Drying Process
  • Powder Recovery
    • Bag filters
    • Cyclone collector
    • Wet scrubber
  • Two and Three Stage Spray Driers
    • Principles of Fluid Beds
    • Process
  • Agglomeration and Instantizing