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.
Deodorization is a vacuum stripping process in which a given amount of a stripping agent (usually steam) is passed for a given period of time through hot oil at a low pressure. Hence, it is mainly a physical process in which various volatile components are removed.
1. Most efficiently designed oil-to-oil heat exchanger ï¬tted in the last tray of Deodorizer ensures minimum heat energy requirement.
2. Elaborate and efficient design of fatty acid scrubbing recovery system ensures virtually no carry over fatty acid scrubbing condenser.
3. Most efficiently designed heating coils which prevents charring of oil during the process.
Deodorization is a process of removing of-ﬂavors, colors and other undesired constituents like free fatty acids from the pretreated and bleached oils.
Inside view of Continuous Deodorizer for high FFA oil
Inside view of Semi-Continuous Deodorizer for specialty fats
Heating of bleached oil is by heat recovered from hot oil of Deodorizer by thermo-siphon arrangement.
Changeover of feed oil at short intervals without any mixing of new feed oil with existing oil under deodorization.
Continuous Deodorizer for high FFA oil