Soybean oil is an edible oil extracted from soybeans. Soybeans contain a variety of nutrients, rich in unsaturated fatty acids and linoleic acid. It is one of the commonly used edible oils in the world and one of the main edible oils on the table of northern Chinese people.
Compared with other oilseeds, soybeans have a lower oil content, only 16%~24%. In order to improve production efficiency, manufacturers often use the extraction process to process soybean oil. However, the extraction process uses a lot of equipment and a large processing volume, and has corresponding requirements for the budget, site, and output of equipment manufacturers. Therefore, most small and medium-sized edible oil processing plants still choose the pressing process to produce soybean oil. With the improvement of living standards, people are very fond of oils produced by physical pressing when choosing edible oils, and the demand market for pressed soybean oil is still very large.
The oil content of soybeans is low. Although the oil yield of the pressing process is not as good as that of the extraction process, in production, doing a good job of pretreatment of soybean raw materials and choosing a reasonable process flow can also improve the oil yield of pressed soybean oil. The pretreatment process of pressed soybean oil is as follows:
The pretreatment process of pressed soybean oil includes cleaning and stone removal, magnetic separation, crushing, softening, steaming and frying. Soybeans need to go through screening, magnetic separation and stone removal to remove impurities such as sand, metal impurities, straw and dust to ensure the purity of the raw materials, and then need to be further crushed into a particle size suitable for oil extraction. The crushed soybeans are softened to make their moisture and temperature reach a suitable state, and then steamed to change the internal structure of the soybeans and improve the fluidity of the oil, thereby improving the oil yield and oil quality.
Pretreatment is an important part of the edible oil processing process. The pretreatment process can clean the oil, change the structure and form of the oil, adjust the temperature and moisture, which is conducive to the subsequent oil extraction, and can improve the quality of soybean oil and the oil production effect. The pretreatment work before oil extraction is mainly aimed at improving the oil yield and providing oil quality. Reasonable pretreatment can not only improve the oil quality and oil yield, but also reduce equipment wear and ensure the stable operation of the equipment.
