Once gathered, the kernels undergo a cleaning process to remove debris, dirt, and any remaining plant material. The most traditional method involves mechanical pressing, where the kernels are crushed under immense pressure to squeeze out the oil.
Industrial Sunflower Oil Extraction: From Kernel to Refined Oil
Crushing and Pressing: Extracting the Oil With the kernels prepared, the extraction process begins. After cleaning, the seeds are typically dehulled, a process that removes the tough outer shell, leaving behind the nutrient-rich kernel which contains the highest concentration of oil.
This allows producers to create specialized products, such as high-oleic oils with a longer shelf life or low-linolenic versions that remain clear in refrigerated conditions. Refining: Purifying the Product Crude sunflower oil straight from the extraction process is dark, viscous, and contains impurities such as phospholipids, free fatty acids, and pigments.
Industrial Sunflower Oil Extraction: From Cleaning to Refining
This mixture is then heated in a process called evaporation, where the hexane is vaporized and separated from the oil. During bleaching, the oil is treated with fuller's earth or activated carbon to absorb any remaining color impurities and trace metals.
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