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The process of peanut oil production by leaching method can be divided into three stages, which are the pretreatment stage of peanut raw materials, the leaching stage of peanut oil and the refining stage of peanut oil. The oil content of peanut raw materials is about 50%, and the peanut oil is generally obtained by pre-pressing and leaching, which can increase the oil yield. The equipment that needs to be used are: peanut pretreatment equipment, peanut oil pre-pressing equipment, peanut oil extraction equipment and peanut oil refining equipment.

　　The pretreatment of peanuts mainly includes peanut cleaning, grading, peeling, drying, removing red coat, crushing, softening, rolling embryo and steaming. The purpose of pretreatment is to clean up impurities in peanut raw materials, adjust the moisture, humidity and structure of peanuts, so as to extract peanut oil more quickly and effectively, and improve production efficiency. Peanut pretreatment equipment includes magnetic separator, vibrating screen, stone remover, sheller, roaster, steamer, peeler, crusher, embryo rolling machine and other equipment.

　　Peanut oil is pretreated to obtain peanut cake, which is pre-extruded through a peanut pre-press machine to extract 80-89% peanut oil, and then the pre-pressed peanut cake is sent to the peanut oil extraction equipment to extract the remaining residual oil. Peanut oil leaching is a process in which the oil is extracted from the peanut cake through the full contact, soaking or spraying of the peanut oil blank and the solvent by using the extraction principle of organic solvents. In the leaching process, the solvent is first brought into contact with the peanut cake, and after soaking for a period of time, the oil in the cake is dissolved in the solvent to form a mixed oil. Using the different boiling points of oil and solvent, the mixed oil is evaporated, stripped, and the solvent is vaporized to obtain peanut oil. The solvent gas enters the condenser through the pipeline, and is recovered and recycled. For a safe production environment, the peanut oil extraction workshop needs a closed environment, which can also ensure efficient extraction efficiency and obtain high-quality peanut crude oil.

The oil obtained by leaching and pre-pressing belongs to peanut oil crude oil. The crude oil contains impurities, such as meal powder, moisture, plant fiber, phospholipids, free fatty acids, pigments, etc. The leached peanut oil will also contain a small amount of solvents, and the presence of these impurities The crude oil is easy to deteriorate, and some are harmful to the human body. For example, moisture can cause the oil to hydrate and rancid, and free fatty acids are harmful to the human body. Therefore, it is necessary to use peanut oil refining equipment to refine and remove these impurities, so as to obtain high-quality refined peanut oil. The refining process of peanut oil refining equipment includes degumming, deacidification, dehydration, decolorization, and deodorization. After refining, the impurities in the crude peanut oil are removed, and the oil obtained is the finished peanut oil.