Crude oil → alkali refining and degumming → decolorization → filtration → deodorization → filtration → refined oil(1) Degumming: Removal of phospholipids, mucus, resins, proteins, sugars, trace metals, etc. in crude oil, generally by hydration refining.
(2) Deacidification: Use food-grade lye neutralization method to remove free fatty acids, acidic pigments, sulfides, insoluble impurities and trace metals in the oil.
(3) Washing with water: wash away the soap and water-soluble impurities remaining in the oil during the deacidification process
(4) Oil dehydration: The water in the refined oil is removed by heating and vacuum drying.
(5) Decolorization: Use clay, aluminum silicate, activated carbon and other adsorbents to remove various pigments, colloids, oxides, etc. in the oil
(6) Deodorization: The principle of vacuum air lift is used to remove low molecular odor substances, free fatty acids, monoglycerides, glycolipids, sulfides, and thermal decomposition products of pigments in the oil.