Approximately 85% of the world's soybean crop is processed into soybean meal and soybean oil, with the remainder processed in other ways or consumed whole. There are two types of soybean oil extraction processes, including pretreatment and pressing process and solvent extraction process. Then, I will introduce them for you one by one.
Soybean is one of the most important oil seeds in the world. Before soybean pressing, soybeans need to be pre-treated, which mainly involves removing impurities in soybeans, adjusting the moisture and temperature of soybeans, and breaking soybeans into small particles to change the molecular structure of soybeans, etc. Pretreatment process is beneficial to subsequent soybean processing. Then the soybean oil after the pretreatment process is directly pressed to obtain crude soybean oil and soybean oil cake.
Soybean → Magnetic separator → Vibrating screen → Destoner → Crushing → Softening → flaking → Cooking → Soybean oil press → Filter → Crude soybean oil and soybean oil cake
Complete soybean oil pretreatment and pressing process
As shown in the figure above, cleaning equipment, crushing equipment, softening equipment, flaking equipment, cooking equipment and puffing equipment are used in the soybean oil pretreatment and pressing process. Cleaning equipment includes magnetic separator , vibrating screen, destoner, etc., which are used to remove impurities in soybeans and improve the quality of crude soybean oil. Other equipment is used to condition the size, density, temperature and humidity of soybean, and make it more easily to be extracted oil out.
The oil content rate of soybean is around 17%, belonging to low oil content oil seeds. Generally, engineers recommend to adopt first puffing then directly solvent extraction process. The solvent extraction process is the best choice for large scale soybean oil extraction plant, because of its low residual oil rate and with higher quality of meal. But its investment is also higher than pressing process.
Soybean → Magnetic separator → Vibrating screen → Destoner → Crushing → Softening → flaking → Puffing machine → Plate dryer → Soybean oil → Solvent extraction
Complete soybean oil solvent extraction process
As shown in the figure above, soybean oil extraction equipment will be used in the soybean oil solvent extraction process. The soybean oil extraction equipment adopts the most scientific oil extraction method to extract crude soybean oil from soybean cake. It uses soybean oil solvent extraction system, D.T.D.C system, miscellaneous oil evaporation system and solvent condensation recovery system to obtain soybean oil and soybean meal.
The above is an introduction to two types of soybean oil extraction processes. If you want to purchase soybean oil extraction process equipment, please contact us! Our engineers team will give you professional suggestions on choosing equipment.