In addition to filtering, the extracted soybean oil also needs to be refined through degumming, deacidification, decolorization and deodorization. The purpose of soybean oil refining process is to remove the residue of the extraction solvent, improve the quality of soybean oil, and make the crude soybean oil meet the national edible oil standards.
1. Remove solvent residues: In soybean oil extraction process, organic solvents (such as hexane) are usually used to extract the oil from soybeans. Although there are special evaporation and stripping steps to remove solvents in the subsequent process, in order to ensure food safety, most of the solvents that may remain in the oil still need to be removed through soybean oil refining process.
2. Improve the quality of soybean oil: The extracted crude soybean oil contains many non-glyceride impurities, such as phospholipids, proteins, pigments, free fatty acids, trace elements, etc. These impurities not only affect the sensory quality of soybean oil (such as color, taste, and smell), but also may accelerate the oxidation and deterioration of the soybean oil and reduce its storage stability. The steps of degumming, deacidification, decolorization and deodorization in soybean oil refining process are to remove these impurities and improve the quality of the oil.
3. Meet edible standards: According to national and international food regulations, commercial edible oils must meet certain quality standards. Unrefined crude soybean oil often cannot meet these standards. Only through soybean oil refining process can the soybean oil meet the specified color, acid value, peroxide value, melting point and other indicators, and can it be legally sold and used in the market.
4. Meet consumer expectations: Modern consumers have extremely high requirements for the quality and safety of edible oils. The soybean oil refining process can ensure that soybean oil is clear, transparent, odorless, and has a pure taste, which meets the preferences and health needs of consumers.
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