When it comes to oil extraction processes, manufacturers investing in oil machinery are likely familiar with the extraction process, which is one of the most widely used oil processing methods in the industry. Depending on the characteristics of the raw materials, common extraction processes include direct extraction and pre-pressing extraction. Pre-pressing extraction is often used for high-oil-content materials, while direct extraction is suitable for low-oil-content materials like soybeans and rice bran. Using direct extraction for these materials can fully extract the oil and produce high-quality soybean meal.

To produce soybean oil using the extraction process, soybeans need to be pre-treated. There are two pre-treatment processes for extracting soybean oil: soybean embryo extrusion and expansion extraction, and direct extraction of soybean embryos. Before extraction, soybeans undergo cleaning, crushing, softening, rolling, and steaming to obtain soybean flakes. These flakes can be directly used for oil extraction or can be extruded and expanded into pellets before extraction.

The extrusion and expansion extraction process can improve extraction efficiency, reduce steam consumption, increase refining rates, and produce high-quality meal. During extrusion, the oil cells are broken, and the oil is exposed on the surface of the expanded material, reducing extraction time and increasing the production capacity of the extraction equipment, which is beneficial for oil extraction.

During the extrusion process, soybeans undergo high-temperature friction and steam heating, which destroys phospholipids and oxidases in the soybeans, accelerating the conversion of non-hydratable phospholipids to hydratable phospholipids. This significantly reduces the content of non-hydratable phospholipids in the crude oil, improving the refining rate during the refining process. Additionally, the high-temperature short-time heat treatment during extrusion deactivates various enzymes to different extents. The deactivation of urease destroys toxic components and anti-nutritional factors in the soybean meal, improving its quality.

Advantages of the Soybean Extrusion and Extraction Process:

1. Reduced Power Consumption: 

The extrusion process breaks the internal structure of the oil material, exposing the oil on the surface of the expanded material, thereby shortening extraction time, increasing the loading capacity of the extraction equipment, and enhancing production capacity. This reduces power consumption without changing the equipment.

2. Improved Extraction Efficiency: 

The denaturation of proteins in the extruded soybean material reduces surface polarity and weakens the ability to absorb liquids, increasing the concentration gradient of the mixed oil during extraction and improving extraction efficiency. Additionally, the solvent content in the wet meal after extraction is significantly reduced, allowing for controlled steam usage during desolventizing.

3. Increased Refining Rate: 

The extrusion process reduces the content of non-hydratable phospholipids in crude soybean oil, thereby increasing the refining yield. High-temperature friction and steam heating during extrusion destroy phospholipids and oxidases, accelerating the conversion of non-hydratable phospholipids to hydratable phospholipids.

4. Stable Quality of Finished Meal: 

The high-temperature short-time heat treatment during extrusion deactivates urease, phospholipase, lipoxygenase, and other enzymes to varying degrees, destroying toxic components and anti-nutritional factors in the soybean meal, thereby improving its quality.

In summary, the soybean oil extraction production line and the soybean extrusion and extraction process have significant advantages in improving oil yield, reducing production costs, enhancing product quality, and increasing labor efficiency. These advantages have led to the widespread application of the soybean oil extraction production line and the soybean extrusion and extraction process in soybean oil production.