Soybean oil refining is a step-by-step process. Oil refining removes phospholipids, pigments, odors, free fatty acids and other impurities from crude oil. The entire refining process includes dephosphorization, degumming, deacidification, decolorization and deodorization.
Soybean oil refining plant main steps:
- Crude soybean oil degumming: In this step gums in crude soybean oil are removed by hydration with the help of phosphoric acid.
- Deacidification ( neutralization): In this step free fatty acids are neutralized by using sodium hydroxide and convert them into soap. Additional impurities are also removed by adsorption on soap.
- Decolorization : During decolorization, unwanted pigments are adsorbed physically and oil will become much clearer.
- Deodorization: Deodorization is used to remove unacceptable odors by steam distillation, the odoriferous compound are stripped off with the help of live injected steam into heated oil under high vacuum pressure.