Which kinds of impurities will go out during the production of rapeseed oil by rapeseed oil equipment?
The components in canola oil other than triglycerides are called impurities. The function of canola oil refining equipment is to remove impurities from edible oil, maintain the biological properties of the oil, and retain or extract useful substances. In fact, canola oil refining equipment does not remove all impurities, but selectively removes impurities from canola gross oil.
According to the composition and nature of impurities in canola oil, they can be divided into three categories:
(1) Insoluble solid impurities, such as silt, cake powder, fiber, clay, catalyst, etc.
(2) Colloidal impurities, such as free fatty acids, sterols, vitamin E, pigments, vitamins, cotton phenol, etc.
(3) Volatile impurities, such as moisture, alcohols, hydrocarbon solvents, odorants, etc.
Most impurities are harmful to the quality and storage safety of canola oil. For example, moisture not only affects the transparency of oil, but also promotes hydrolysis and rancidity. Free fatty acids affect flavor and promote rancidity. Phospholipids can make the oil turbid and produce black precipitates when heated, foaming, and bitter taste. Various pigments directly affect the color of oil and also promote rancidity. The presence of colloids, sulfur-phosphorus compounds, saponins and heavy metal salts makes it difficult to deacidify in subsequent processes such as vapor extraction.