Degumming: Remove gums in the crude oil to improve oil edibility, storage and do well to downstream neutralizing section.
Neutralizing: Remove Free-Fatty Acids (FFAs) with caustic soda (NaOH). Soap stock is generate in this process.
Decolorizing / Bleaching: Remove color pigments contained in oil
Deodorizing: Remove disagreeable flavor and odors that are naturally present or created during processing under high temperatur
Dewaxing (Optional): Oils like sunflower oil or maize germ oil (corn oil) have waxes present in them. At low temperatures these waxes give a hazy appearance to the oil. So, in extremely cold areas, dewaxing should take into accout when processing these oil seeds.
