The specific steps of rice bran oil extraction production line mainly include the following aspects: pretreatment,solvent extraction, wet meal desolvation, miscella treatment, solvent recovery.The extraction method can process a large amount of rice bran raw materials, form large-scale production, avoid the rancidity of rice bran during long-term storage, thereby improving the production efficiency of the oil plant, ensuring that the residual oil rate in rice bran remains within an extremely low range, and improving the oil yield. At the same time, although the rice bran oil obtained by extraction is relatively dark in color, and the acid value and wax content are relatively high, the vitamin E and oryzanol content are relatively high, and the edible value can meet the needs of the public.

The ability of extracted extruding rice bran is about 20% higher than that of direct extraction of rice bran, which can improve the extraction characteristics of materials, increase the penetration rate of solvents in materials, save energy, reduce the solubility of wet meal, and increase the concentration of mixed oil. The extraction method oil-making machinery and equipment have a high degree of automation, reduce labor intensity, and improve production efficiency. After the extraction of rice bran oil by the extraction method, the protein and other substances in the cake are well retained, which is very convenient for protein extraction or as a raw material for food processing.

The advantages of extraction of oil from rice bran by extrusion and extraction:

1. Improve oil yield: 

Extrusion can make rice bran form a porous, air-permeable columnar structure, significantly increase the penetration area and speed of the solvent, and thus improve the extraction efficiency. According to data, the oil yield can be increased by 25%~35% compared with unpuffed rice bran.

2. Passivation of lipase:

Through the extrusion process, the lipase in the rice bran is fully passivated and loses its activity, which greatly reduces the risk of rancidity of oil during storage, prolongs the shelf life of rice bran, and thus reduces the acid value of the extracted crude oil, significantly improving the quality of oil products.

3. Improve oil extraction characteristics:

The extruding rice bran has good extraction characteristics, and the solvent can quickly and evenly penetrate the material, which is conducive to shortening the extracting time, reducing the solubility of wet meal, and increasing the concentration of mixed oil, thereby enhancing the desolventizing effect of the degassing machine and evaporator, and reducing energy consumption and various operating costs.

4. Prevent rancidity:

The extraction method is used to produce rice bran oil, especially with the expansion process, which can process a large amount of rice bran raw materials on a large scale in a short time, avoid rancidity caused by long-term storage, ensure the production continuity and efficiency of the oil plant, and improve the oil yield of the finished product.

5. Large-scale production:

The extraction process is suitable for large-scale industrial production, can quickly process a large amount of raw materials, adapt to market demand, and is conducive to the oil plant to achieve economies of scale.

It should be noted that the rice bran oil produced by the extraction method will contain various impurities, such as cake powder, plant fiber, phospholipids, free fatty acids, pigments, moisture, solvents, etc. These impurities will not only affect the quality of the oil, but also cause the oil to become rancid. Therefore, the extracted crude rice bran oil must be refined, and impurities and harmful elements must be removed through processes such as degumming, deacidification, dehydration, decolorization, deodorization, and dewaxing to become edible rice bran oil.