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Cooking Oil Extraction
Cooking oils are daily necessities used in all over the world and different types of oilseeds are grown at everywhere. Cooking oil from any oilseeds such as groundnut (peanut), palm nut, coconut, sheanut, sesame, sunflower seeds, cotton seeds, soybean, canola etc. can be produced by extraction. The final extracted oil from this machinery will be filtered, pure, fresh and with natural taste, color and odor. Hence people like to use this oil very much as the natural oils. The main by product is cake and which is used as a raw material of animal feed or can be used as a raw material of solvent extraction plant.
Cooking Oil Extraction
Cooking oil extraction is nearly the same as other edible oil extraction. Extraction from seeds is accomplished either by mechanically pressing or by mixing with such gasoline-like solvents as hexane and heptane (which are lung irritants and nerve depressants).
If the chemical extraction method is used, the oil is extremely flammable, and some factories have been known to blow up or catch on fire. Later, the oils are steam heated to evaporate the solvents at temperatures around 300°F. Most of the solvents are evaporated, but not all. The primary objective of this step is to produce a clean, crude oil product. Be aware that, at this stage, the oil can now be bottled and sold as "unrefined oil" in health food stores and delicatessens. Oil designated for more refining goes through more processing procedures. After being mashed and cooked for up to two hours at varying temperatures, depending on the seed type, mechanically pressed seeds are subject to additional heating during the "auger" process, where the average temperature reaches about 120°C (248°F) with higher temperatures and pressures producing more oil. At this temperature, however, oil reacts with oxygen more than 100 times faster than at room temperature, producing fatty acid damage. In some cases, after mechanical pressing, the oil is filtered and sold as unrefined oil, but more often, the oil undergoes further refining.
