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Soybean oil is an edible oil with a light and clean flavor that is commonly used for cooking. The oil is 60% polyunsaturated fat and 24% monounsaturated fat, according to the National Soybean Research Laboratory, making it a heart healthy oil. Soybean oil is extracted by several methods. Commercially, chemical extraction using hexane is common.
Hexane in Solvent extraction method Hexane in its pure form is a colorless liquid , and its boiling point is between 50℃ - 70℃ all of which work in favor for oil extraction. To begin the process of solvent extraction, oil seeds (soybean, rapeseed etc.) are removed of impurities and dried to reduce moisture content.
Hexane extraction of oilseeds was introduced in the 1930s and there is no evidence to substantiate any risk or danger to consumer health when foods containing trace residual concentrations of hexane are ingested. Hexane extraction of oil from soybeans is established as a safe and efficient process.
Solvent extraction of soybean Basic principles and elements of solvent extraction Oil extraction is to extract the oil from the embryo by wetting and infiltration, molecular diffusion and convective diffusion with solvent which can dissolve the oil. The mixture of solvent and fat is then separated to recover the solvent to obtain the crude oil.
stage where 60 - 70% of the oil is removed. Oil Extraction The chemical oil extraction takes place in the extractor. In this equipment a solid bed is formed which is continuously immersed in miscella (oil mixed with hexane). The solvent passing through the material bed carries the oil from solids to the miscella.
The extraction process uses hexane or other solvents to wash the soybean oil from the prepared soybean flakes. The design of the equipment varies so that Crown can optimize the amount of solvent and bed depth needed to efficiently wash the flakes, the contact time of the solvent and flakes, and the power and utilities needed to run the equipment.
Soybean, hexane, and water are the sources of materials costs; with soybeans taking up 99% of total material cost. Because hexane is recyclable and runs counter-current with the percolation process applied in extraction, the cost of hexane is remarkably low.
Soybean Oil Production Process. Counterflow is used as extraction system because it gives the highest yield. After removing the hexane, the extracted flakes only contain about 1% of soybean oil and is used as livestock meal or to produce food products such as soy protein. The hexane is separated from the soybean oil in evaporators.