According to the composition and properties of the impurities in the oil, it can be divided into three categories: 1. Insoluble solid impurities, such as sand, cake powder, fiber, etc., clay, catalyst and the like. 2. Peptizing solid impurities, such as sand, cake powder, fiber, etc., clay, catalyst, and the like. 2. Peptizing impurities such as FFA, vitamin E, pigment, vitamins, gossypol and the like. 3. Volatile impurities: such as moisture, odorous substances, etc.
Most impurities are detrimental to grease quality and storage safety.
For example, moisture not only affects the transparency of oils but also promotes the hydrolysis of oils and rancidity; insoluble impurities and acidic substances are all contributing factors to the deterioration of oils; FFA affects flavor and promotes deterioration; phospholipids can make oils turbid, and produce black precipitates when heated, Bubbles, bitterness, etc. Various pigments directly affect the oil color, and some will promote the rancidity of the oil. There are also some useful "impurities" in hair oil such as tocopherol, oryzanol, etc., which are both natural antioxidants for oils and fats. It is allowed to be preserved during refining, and it can also be extracted for use. Phospholipids are a class of "impurities" that must be extracted and have a high utilization price.
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