The process begins by immersing the pressed cake in a food-grade solvent, usually hexane. This is typically done using magnets, sieves, and air classifiers.
From Seed to Bottle: The Journey of Vegetable Oil Production
The quality of the final oil begins long before extraction, with careful selection based on oil content, protein levels, and desired characteristics. Once harvested, the raw materials undergo rigorous cleaning to remove dirt, stones, and other impurities.
The third stage, bleaching, passes the oil through activated clay or carbon to strip out pigments, vitamins, and any remaining metal ions. Next is neutralization, which removes free fatty acids using an alkaline solution, creating soapstock that is later separated.
From Seed to Bottle: The Journey of Vegetable Oil Production
The result at this stage is a crude vegetable oil mixed with residual solvent and impurities. The kernels or beans are then cracked into smaller pieces to increase surface area, making the oil more accessible during extraction.
More About How is vegetable oil made
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