Soybean oil is a common edible oil in daily life, and its oil yield is directly related to the economic benefits of soybean oil processing plant and the satisfaction of consumers. So, how to effectively improve the oil yield of soybeans? The following three aspects are discussed: soybean raw material selection, soybean pretreatment and processing technology.

1. Selection of soybean raw materials

The oil content of soybeans is the basis of determining the oil yield. Therefore, when purchasing soybean raw materials, priority should be given to soybean varieties with high oil content. Generally speaking, soybeans with full grains, high maturity and less impurities have higher oil content. In addition, the oil content of soybeans stored for too long or moldy due to moisture will decrease, so the soybean oil processing plant needs to strictly control the storage conditions of raw materials to ensure their freshness and quality.

2. Soybean pretreatment link

Pretreatment is a crucial link in the process of soybean oil extraction, which is directly related to the oil yield and oil quality. First, soybeans need to be cleaned to remove impurities such as dirt, stones, weeds and metals, so as to prevent impurities from adsorbing grease or polluting crude oil. Second, soybeans were crushed and softened, and the plasticity was enhanced by adjusting temperature and moisture, so as to prepare for the subsequent process. Then, in the embryo rolling process, soybeans are pressed into thin slices, which destroys the cell structure and shortens the path of oil outflow. Last, the soybean cake embryo was steamed at high temperature to further promote the oil coagulation, thus effectively improving the oil yield. These steps are interlocking, which ensures the high efficiency of the oil pressing process and the quality of the final product.

3. Processing technology of soybean oil

The choice of soybean oil processing technology directly affects the oil yield and nutrient retention. Traditional physical pressing technology can keep the nutrition of soybean oil well, but the residual oil rate is high, about 6%-7%, which is suitable for scenes with high nutritional requirements and small processing capacity. In the expansion solvent extraction process, soybeans are expanded at high temperature and high pressure to make their structure more porous, and then oil is extracted with organic solvent. The residual oil rate is only 1%, and the oil yield is significantly improved, but some nutrients may be lost. Different processes should be reasonably selected according to the demand.

In a word, improving soybean oil yield needs to start from the whole process of raw material selection, pretreatment and processing technology. Through scientific management and technical optimization, we can not only improve economic benefits, but also provide consumers with high-quality soybean oil products. In order to achieve higher oil yield, soybean oil processing plants should constantly improve their production technology according to their own actual conditions.