Soybean oil extraction machine
Soybean oil extraction machine is a device that extracts soybean oil by using soybean as raw material, after screening and pretreatment section, and then by pressing or extraction.
Soybean oil is also called soybean oil. As the name implies, it is derived from soybean crushing or extraction. Compared with other oil and fat raw materials, soybean oil content is low, only 16% to 24%. In order to achieve maximum benefits, manufacturers usually use the leaching method to obtain most of the oil in soybeans during the process of squeezing soybeans. Therefore, most of the soybean oil that can be seen on the market is refined oil produced by the leaching method.
As the soybean raw material market is full of different types of genetically modified soybeans, carefully read the label when selecting soybean oil to understand whether the product’s raw material uses leaching oil-production process: the leaching method uses solvent oil (No. 6 light gasoline)) The oil and fat raw materials are extracted after being fully immersed, and processed through the “six de” process (that is, degreasing, degumming, dehydration, decolorization, deodorization, and deacidification). The biggest feature is the high oil yield and low production cost. The price of soybean salad oil is generally lower than that of pressed oil. During the leaching process, the residue of the solvent in the edible oil is inevitable. National standards stipulate that even if the qualified leached soybean oil is allowed to contain ten milligrams of solvent residue per kilogram.
Soybean oil produced by a soybean oil extraction machine is derived from soybean seeds. Soybean oil is the most produced fat in the world. The color of soybean oil varies depending on the seed coat and variety of soybean. Generally light yellow, slightly green, dark brown, etc. The refined soybean oil is light yellow .
Soybean oil extracted by soybean oil extraction machine, its physical and chemical constants: relative density (d20℃4℃) 0.9150-0.9375 refractive index (n20℃D) 1.4735-1.4775 viscosity (E020℃) around 8.5 freezing point (℃) -18～-15 Iodine value (g iodine/100g oil) 120-137 Saponification value (mgKOH/g oil) 188-195 Total fatty acid content (%) 94.96 Average molecular weight of fatty acids around 290
Soybean oil extracted by soybean oil extraction machine, fatty acid composition Composition Content (%) Composition Content (%)
Palmitic acid 6-8 Oleic acid 25-36 Stearic acid 3-5 Linoleic acid 52-65 Arachidic acid 0.4-0.1 Linolenic acid 2.0-3.0
The soybean oil extracted by the soybean oil extraction machine contains a large amount of linoleic acid. Linoleic acid is an essential fatty acid for the human body and has important physiological functions. Toddlers lack linoleic acid, their skin becomes dry, their scales thicken, and their growth is stunted; the lack of linoleic acid in the elderly can cause cataracts and cardiovascular and cerebrovascular diseases. Soybean oil has a beany smell and can be removed after refining, but it has a tendency to aftertaste during storage.
In addition to containing fat, soybean oil also brings in some non-oil substances during processing. Unrefined crude oil contains 1%-3% phospholipids, 0.7%-0.8% sterols, and a small amount of protein and wheat germ phenol Such substances can easily cause rancidity, so if soybean oil is not hydrated to remove impurities, it is not suitable for long-term storage. In addition, during long-term storage of refined soybean oil, the color of the oil will gradually change from light to dark. The reason may be related to the automatic oxidation of oil. Therefore, when the color of soybean oil becomes dark, it is not suitable for long-term storage.
The method and process of the soybean oil extraction machine are different, and the extracted soybean oil is also different
 Different smoke points
The smoke point of pressed soybean oil is 166 degrees Celsius, and the smoke point of leached soybean oil is 175 degrees Celsius. Leaching oil refining conditions are more severe than squeezing oils, corresponding to less impurities, high purity, high smoke point, and operating temperature can also be higher when used. The smoke point of pressed oil is lower than that of leaching oil, so it is not suitable for high temperature cooking. The refining degree of leaching oil is large and complicated, so the impurity content is much lower.
 Complex refining degree
The processing technology of squeezed oil is “physical squeezing method”, which is to extract the oil from the raw material by physical method and mechanical extrusion. The processing technology of the leaching method is “chemical leaching method”. A method of extracting fats and oils from oils with food grade solvents. The advantage of this method is the high oil yield, which is suitable for large industrial production. Therefore, the degree of refining of pressed oil is also relatively complicated.
 Different processing techniques
Squeezing is a traditional process. Put oil-pressing substances, such as peanuts, in a container, and pressurize the container to squeeze out the oil.
Leaching is to extract the oil inside with a chemical organic solvent. Because the solubility of fats and oils in these solvents is relatively high, it is easy to dissolve them and then separate the fats and oils from the solvent.
 Different nutrients
Squeezed soybean oil has the characteristics of complete color, aroma and flavor, and retains the characteristics of various nutrients. The leached soybean oil is colorless and has a slight gasoline smell. After processing, most of the nutrients are destroyed.
 The price difference
Pressed soybean oil retains the original flavor of soybeans, so the requirements for soybean raw materials are very strict, the raw materials require fresh, low acid value and peroxide value, so the price is relatively high; at the same time, because only pressing, the residual oil in soybean cake is high, The oil yield of pressed oil is relatively low. So the price of pressed soybean oil is relatively high.