The Desolventizer (D.T.D.C.) is used to evaporate and separate the solvent and some moisture out from Wet Meal. The oil meal after oil drain we call wet meal. Negative pressure in the extracting system has helped against solvent gas escaping out. Then the miscella oil sent to the temporary storage tank and go for Evaporating System, and the oil meal go for Desolventizing process. The meal is feeded into each cell, from inlet to outlet, using the different concentration miscella oil spraying, and before the miscella drains out, using the the fresh solvent spaying to exact the oil out completely from cake. The cake is temporarily stored in the buffer bin and stacked in certain height for the purpose of keeping constant flow and sealing against solvent gas escaping from extractor during the extractor is running or shutdown. The buffer bin could control the meal level automatically by sealed valve at the bottom of the buffer bin. The meal(cake) or flakes comes from the pretreatment or prepressing plant is conveyed to the extraction workshop buffer bin by scraper conveyor. It can be seen that compare to oil pressing method, solvent oil extraction method is indeed an efficient way of edible oil production, which has been widely used at present. The disadvantage of solvent oil extraction process is that there will be residual solvent in crude oil, but if it is strictly operated according to the standard, the residual cannot be detected in final product. Solvent oil extraction method has the advantages of low residual oil rate, less than 1% residual in the cake (high oil yield), low labor intensity, good working environment and good quality of meal. The solvent vapor volatilized during desolution and drying is still recovered by condensation and cooling. After desolution and drying, the meal can be dried. The meal also contains a certain amount of solvent. The solvent vapor is recycled after condensation and cooling. The basic process is to immerse oil flakes (or pre-pressed cakes) in selected solvents, dissolve oil in solvents (composing mixed oil), then separate the mixed oil from solid residues (meal), evaporate and strip the mixed oil according to different boiling points, so that the solvent vaporizes into vapor and oil separates, thus obtaining oil (extracted crude oil). In order to make full use of oil resources and improve economic benefits, oil cakes after pressing should generally continue to be extracted to produce cooking oil. Solvent oil extraction is a method of making edible oil by using the principle of extraction and selecting a kind of organic solvent which can dissolve oil and grease, through contacting with the oil (soaking or spraying), so that the oil and grease in the oil can be extracted.Īt present, the international common practice is: vegetable oils with high oil content (such as peanuts and rapeseed, sunflower seeds, cottonseeds, etc.) are usually produced by pre-pressing and solvent extraction technology vegetable oils with low oil content (such as soybeans) are usually produced by direct extraction. Home > Products > Solvent Oil Extraction >
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