The third stage, bleaching, passes the oil through activated clay or carbon to strip out pigments, vitamins, and any remaining metal ions. The refining process typically involves four key stages.
Cracking Kernels: How Oil is Extracted from Seeds
Mechanical pressing, also known as expeller pressing, uses a giant screw press that crushes the flakes under immense pressure, squeezing the oil out. Hexane is highly effective at dissolving the oil, separating it from the solid protein fibers.
Next is neutralization, which removes free fatty acids using an alkaline solution, creating soapstock that is later separated. The process begins by immersing the pressed cake in a food-grade solvent, usually hexane.
Cracking Kernels to Extract the Oil
The result at this stage is a crude vegetable oil mixed with residual solvent and impurities. Raw Material Selection and Preparation The foundation of any vegetable oil lies in the raw material.
More About How is vegetable oil made
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