Dry Degumming and Bleaching Process
Dry degumming process is useful for removing phospholipids composed of phospatida, protein, residues, carbohydrate, water and resin without reducing the amount of fatty acids. Temperatures used for degumming process is 85°C. Phosphoric acid added to the degumming process to bind the gum in oil. The amount of phosphoric acid is generally about 0.5 to 2 kg for flow rate 3 tons/hour palm oil. Bleaching process is the advanced stage after degumming process. Degummed oil through a bleaching stage separate the pigments contained in the oil using the active material so that the color becomes brighter. Active material in this process is bleaching earth. At the end of process, bleched oil filtering by two pressure leaves filters to separate bleaching earth.