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       The process of leaching oil by leaching equipment:

　　The theoretical basis of the leaching process of oil-making with leaching equipment is the extraction principle, which uses the characteristics of oils to be dissolved in organic solvents to separate oils from oils. Oil production by leaching method is a stable, hygienic, scientific and advanced oil production process. The leaching process for oil production accounts for more than 90% of oil production in developed countries. The advantages of the leaching method for preparing oil are that the leached meal cake contains less residual oil, high oil yield, low processing cost, high economic benefit, high meal quality, and good feeding effect.

       The process of oil production by leaching method:

       The oil embryo or pre-pressed cake is immersed in the selected solvent to dissolve the grease in the solvent to form a mixed oil, and then the mixed oil is separated from the solid residue (meal), and the mixed oil is evaporated and stripped according to different boiling points. The solvent is vaporized into vapor and separated from the oil to obtain grease, which is also called leaching crude oil. The solvent vapor is condensed, cooled and recovered and then reused. The meal also contains the required amount of solvent. After desolventizing and drying, the dried meal is obtained. The solvent vapor volatilized during desolventizing and drying is still condensed and cooled for recycling.

       Classification of oil-making process by leaching method:

　　According to the operation mode, the leaching process can be divided into batch leaching and continuous leaching.

       ①The intermittent leaching material embryo enters the extractor, the meal is discharged from the extractor, the injection of fresh solvent and the extraction of the concentrated mixed oil are all batch, intermittent, and periodic leaching processes belonging to this process type. .

       ②The continuous leaching material embryo enters the extractor, the meal is discharged from the extractor, the injection of fresh solvent and the extraction of concentrated mixed oil are all continuous leaching processes belonging to this process type.

　　According to the contact method, the leaching oil process can be divided into immersion leaching, spray leaching and mixed leaching

　　① Immersion leaching; the material embryo is soaked in a solvent to complete the leaching process is called immersion leaching. The immersion-type leaching equipment includes a tank type, in addition to bow-type, U-type and Y-type extractors.

　　②Spray leaching; the solvent is in the spray state to contact the material embryo to complete the leaching process is called spray leaching. The spray leaching equipment includes crawler leaching equipment and so on.

　　③Hybrid leaching: This is a leaching method that combines spraying and soaking. The hybrid leaching equipment includes a flat-rotating leaching device and an annular leaching device.