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Pretreatment process before soy extraction equipment leaching

September 08, 2021

Soybeans need to be pretreated before entering the soybean extraction equipment for oil production. The soybeans are made into easy-to-leaching oil cakes through cleaning, crushing, softening, embossing, steaming and other processes. The quality of soybean pretreatment is related to the leaching of soybean oil. Quality and oil making effect.

Pretreatment process

  The process of soybean pretreatment:

      1. Cleanup; the pretreatment of soybeans must first be cleaned up. The silt, stones, stems and leaves, iron and moldy soybean grains contained in the raw soybeans are used for screening, winnowing, magnetic separation, and specific gravity according to different physical properties. Choose other methods to remove it. Cleaning equipment includes vibrating screen, specific gravity stone remover, suction separator, permanent magnet drum, etc.

  2. Crushing: If the water content of the cleaned soybean is lower than 13%, it can be crushed directly. It is required to be broken into 2-4 petals. If the water content is higher than 13%, it needs to be dried before being broken. Soybean pretreatment process needs to be dehulled first. Soybean dehulling requires that the moisture content be reduced to less than 12%, dried to 9%-10% moisture, and then crushed. This is conducive to the separation of soybean kernels and seed coats. The aspirator sucks the bean curd away. Crushing equipment includes roller crushers and so on.

  3. Softening: Softening is an important pretreatment process before embryo rolling. The oil can be adjusted to suitable moisture. Soybean texture is hard, and softening can make texture softer and increase plasticity. Softening equipment includes softening pot, softening box and so on.

  4. Embryo rolling: The soybeans that have been crushed and softened must be rolled through the embryo rolling equipment to make them into embryos or raw embryos that require thickness. The blank rolling equipment includes a blank rolling machine. Commonly used are single-pair roll, double-pair roll, three-roll and hydraulic compact roll embryo rolling mills. Rolling embryo can destroy the cell tissue of soybean oil, so that the oil can be separated from the cells; soybean oil is rolled into thin slices, and the oil comes out of the embryo, which is easy to produce oil; the soybean oil after rolling is steamed and fried, and the heat absorption surface is enlarged. It absorbs heat evenly and is easy to absorb moisture.

  5. Steaming and frying: The process of steaming and frying the raw embryo after rolling the embryo through wet heat treatment such as adding water, heating, drying, etc. is steaming and frying. The steaming and frying equipment is a steaming and frying pan, which can be vertical or horizontal. Vertical steaming and frying pans are often used in large oil and fat processing plants.

  The pretreatment of soybean oil can reduce the impurities in the raw materials, reduce the wear of subsequent equipment, increase the output of the equipment, increase the oil yield during the leaching process of the soybean leaching equipment, and maximize the quality of oil, cake and by-products.