Due to the crude soybean oil obtained from either the cooking oil pressing plant or the solvent extraction plant contains a certain amount of useless impurities. Therefore, the crude soybean oil needs to be refined and purified through a refining process. From crude soybean oil to standard cooking oil needs to go through four basic stages of degumming, deacidification, decolorization and deodorization. Next, I will introduce the refining process of soybean oil in the order of these work sections.
Soybean oil refining process and the refining machines
1. Hydration degumming
In this step, we add hot water to dissolve colloidal impurities in crude soybean oil to remove excess phospholipids and make the color more vivid and obtain purer soybean oil;
Due to the crude oil after degumming still contains excessive free fatty acids， so we need to add alkali to deacidify, let out the soap stock after settling and obtain acid-base neutralized refined soybean oil;
Then, we add white clay as an adsorbent to remove pigment in the crude oil and filter with a leaf filter after full reaction to improve the color of the oil and to obtain refined bleached soybean oil.
4.High temperature deodorization
Finally, the odor and part of free fatty acid in crude soybean oil were removed by distillation to improve the quality of the soybean oil further and obtain edible soybean oil.
After reading this introduction, you may have a general understanding of soybean oil refining process. Doing company is professional in soybean oil mill plant design, installation, technical consulting and will provide you with the most professional answers and can tailor the big, middle, small scale soybean oil processing production line for you. If you are interested in establishing a soybean oil refinery plant or purchasing soybean oil refining machines, please contact us.