Continuous Deodorizer for High FFA Oils
Vegetable oil is heated to the desired temperature in a multi-compartment Vacuum Heater with counter current flow of vegetable oil and heating medium i.e. High Pressure Steam or Thermic Fluid.
Pre-heating is gradual and methodical so that all of the oil comes in contact with this sparging system at the free surface exposed to vacuum.
Packed Column with packings of large surface area is provided on the top of Deodorizer. This ensures reduction of Free Fatty Acids to the desired level.
An additional top heating tray is provided below the Packed Column to compensate for the unavoidable loss of heat due to evaporation of Fatty Acids.
Perfect deodorization is accomplished by providing large free surfacing area contact between oil and stripping steam at an absolute pressure of 2 m bar. This results in furnishing oil surface layer of numerous bubbles having 5 – 10 mm diameter. These small bubbles burst and they discharge the water vapour saturated with distilled fatty acids and the odoriferous compounds. These ascending vapours are immediately and freely taken out into lateral ducts through the large section opening provided on top of each stripping tray. This ensures virtually no pressure drop from top to the bottom tray.
