Soybean oil, as one of the common edible oils, has attracted a lot of attention for its production methods. This paper comprehensively explores the methods of soybean oil production, including the physical pressing method and the solvent extraction method, and conducts a comparative study on the solvent n-hexane used in the extraction method, the safety of the two methods, as well as the advantages and disadvantages of the two methods.

Soybean oil extraction:

Soybean oil is most commonly produced by the solvent extraction method, which uses the solvent n-hexane to dissolve the oils and fats in soybeans, and then removes the solvent through distillation to obtain soybean oil.

I The process is as follows:

1 clean soybeans for peeling, crushing, embryo rolling, puffing and a series of processing.

2 The expanded soybeans are sent to the extraction workshop to obtain soybean extraction oil through the principle of solvent extraction of oil and fat.

3 Then the soybean extracted oil will go to the refining workshop to remove the solvent residue, gum, color acid and so on in the oil.

4 After the refining of soybean oil is generally a soybean oil, the indicators should be in line with national safety standards

II soybean oil extraction process advantages and disadvantages:

Advantages: high oil yield, relatively low cost.

Disadvantages: the use of chemical solvents in the production process.

Soybean oil pressing:

Soybean oil in addition to the extraction method of oil, but also through the oil press for pressing production, is through the mechanical extrusion of the soybean in the way to extract the oil. Soybean oil produced by this method can better retain the flavor and nutrients of soybeans.

I The soybean pressing process is as follows:

1 The cleaned soybeans are steamed and fried, and if they are raw pressed, the soybeans can directly enter the oil press for pressing.

2 The soybean oil obtained from pressing is filtered and refined to obtain the finished oil after pressing.

3 At present, more than 90% of the soybean oil on the market are processed by extraction, but with the enhancement of people's health awareness, the choice of oil is more inclined to physical pressing, nutrient-rich edible oil, so the process of pressing soybean oil is also gradually replacing the extraction process, but in general, no matter whether it is the present or the future, the extraction method of soybean oil is still used by the majority of manufacturers.

II the soybean oil pressing process advantages and disadvantages:

Advantages: can retain more nutrients and flavor, do not use chemical solvents.

Disadvantages: relatively low oil yield and high cost.

Safety comparison:

Physical pressing: does not involve the use of chemical solvents, from this point of view, it is relatively more "natural".

Extraction: As long as the national standards and specifications are strictly followed, the solvents can be processed to reach a very low residual amount, which meets the national safety standards and will not be harmful to human health.

Physical pressing and extraction are both safe under the premise of compliant operation. Physical pressing is perceived as more "natural and safe" because it does not use chemical solvents, but extraction is also safe for consumption because the residual solvents are within the safe range under strict control and testing.