Processing of prepressed solvent extracted oil from indian soybean‐refining loss studies

Abstract

Degumming of soybean oil considerably reduces the free fatty acid (FFA) content of the oil. Lowering of refining loss when oil is degummed prior to caustic treatment is attributed to this reduction in FFA and the excess carry over of neutral oil, because gums are excellent emulsifiers. Pretreatment of solvent extracted soybean oil with phosphoric acid followed by water degumming and caustic refining results in a lower refining loss and considerable reduction in caustic requirement in comparison to the conventional process based on water degumming followed by gum conditioning with phosphoric acid and caustic refining. The process gives sharp and fast separation of gums from the oil.