Flaking breaks the seed cell walls to improve oil flow. The remaining oil trapped in the press cake is then extracted using hexane, a petroleum-based solvent that dissolves the residual oil without damaging the protein structure.
Understanding the Hexane Extraction Process for Canola Oil
Once cleaned, the seeds are rolled to crack the seed coat and then subjected to high-pressure rolling mills or flaking rolls to break the cells and prepare the material for oil separation. Refining: Transforming Crude into Consumer Oil The crude canola oil extracted via solvent methods is a dark, viscous liquid containing free fatty acids, phospholipids, pigments, and off-flavors that require refinement.
Deodorization and Winterization Perhaps the most critical step in refining is deodorization, where the oil is heated under a vacuum to strip volatile compounds that cause strong odors. Cooking denatures enzymes and reduces oil viscosity.
The Hexane Extraction Process for Canola Oil
Mechanical Pressing and Solvent Extraction After flaking, the material is cooked to reduce viscosity and then sent through a series of screw presses or hydraulic presses to extract a portion of the oil. The journey from field to bottle involves cleaning, crushing, heating, and chemical extraction, followed by refining, bleaching, and deodorizing to create a product with a high smoke point and long shelf life.
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