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 The quality of crude oil and its pretreatment quality are the prerequisites of the physical refining process. Rancid oils are destroyed by natural antioxidants. The intermediate oxidation products are complex and affect the flavor and stability of the product. The non-hydrophilic phospholipids in crude oil are mostly carriers of metal ions such as calcium, magnesium, and iron. Their presence will cause the product to deepen its color, decrease its transparency, decrease its flavor and stability, and even make the process of deacidification and deodorization fail. Therefore, it is particularly important to ensure the quality of crude oil and the quality of physical refining pretreatment. The main equipment is a deacidification tower. Grease with non-hydrophilic phospholipid content of less than 0.1% and iron content of less than 2ppm can be processed by dry degumming; grease with non-hydrophilic phospholipid content of less than 0.5% and iron content of less than 2ppm requires special wet processing Degumming. If the non-hydrophilic phospholipid content and iron content in the oil exceed the above requirements, it is not suitable for physical refining, and only alkali refining can be used for refining. The pretreatment of physically refined fats and oils includes degumming and decolorization. The pretreatment of oils with low gum content (palm oil, tallow and other non-hydrophilic phospholipids content of less than 0.1%, iron ions less than 2ppm) can be degummed and decolorized in the same process. For oils with a non-hydrophilic phospholipid content of less than 0.5% and iron ion content of less than 2 ppm, it needs to be pretreated by two processes of phosphoric acid conditioning hydration or special hydration degumming and activated clay decolorization. Non-hydrophilic phospholipids and fats with iron ion content exceeding the above range are not suitable for physical refining in principle.

 The quality of crude oil and its pretreatment quality are the prerequisites of the physical refining process. Rancid oils are destroyed by natural antioxidants. The intermediate oxidation products are complex and affect the flavor and stability of the product. The non-hydrophilic phospholipids in crude oil are mostly carriers of metal ions such as calcium, magnesium, and iron. Their presence will cause the product to deepen its color, decrease its transparency, decrease its flavor and stability, and even make the process of deacidification and deodorization fail. Therefore, it is particularly important to ensure the quality of crude oil and the quality of physical refining pretreatment. The main equipment is a deacidification tower. Grease with non-hydrophilic phospholipid content of less than 0.1% and iron content of less than 2ppm can be processed by dry degumming; grease with non-hydrophilic phospholipid content of less than 0.5% and iron content of less than 2ppm requires special wet processing Degumming. If the non-hydrophilic phospholipid content and iron content in the oil exceed the above requirements, it is not suitable for physical refining, and only alkali refining can be used for refining. The pretreatment of physically refined fats and oils includes degumming and decolorization. The pretreatment of oils with low gum content (palm oil, tallow and other non-hydrophilic phospholipids content of less than 0.1%, iron ions less than 2ppm) can be degummed and decolorized in the same process. For oils with a non-hydrophilic phospholipid content of less than 0.5% and iron ion content of less than 2 ppm, it needs to be pretreated by two processes of phosphoric acid conditioning hydration or special hydration degumming and activated clay decolorization. Non-hydrophilic phospholipids and fats with iron ion content exceeding the above range are not suitable for physical refining in principle.