Cooking oil refining machine
The purpose of cooking oil refining is to use the different physical and chemical properties of oil and impurities in it to separate the oil from impurities, so as to improve the safety and storage stability of oil and fat. The production process of the cooking oil refining machine is determined by the following aspects: ①The nature and quality of the oil; ②The depth required for refining; ③Preventing the quality deterioration during the refining process; ④Maximum separation of high value-added by-products. The process of cooking oil refining machine includes: removal of mechanical impurities, deacidification, decolorization, deodorization and dewaxing.
Degumming section of cooking oil refining machine: main equipment: hydration tank, centrifuge
In edible oils and fats, if the content of phospholipids is high, it is easy to foam, smoke, and overflow the pan when heated, and the phospholipids are oxidized at high temperatures to make the oil brown, which affects the flavor of fried food. To remove phospholipids, mucus, resins, proteins, sugars, trace metals, etc. in crude oil, generally adopt hydration method, acid refining method, etc.
Deacidification section of cooking oil refining machine: main equipment: alkali refining tank, washing tank, centrifuge
Free fatty acids affect the stability and flavor of oils and fats. Food-grade lye neutralization method is used to remove free fatty acids, acid pigments, sulfides, insoluble impurities and trace metals in oil.
Decolorization section of cooking oil refining machine: main equipment: dehydration tank, decolorization tank
Crude oil contains pigments such as chlorophyll and carotenoids. Chlorophyll is a photosensitizer that affects the stability of oils, while other pigments affect the appearance of oils. Adsorbents such as clay, aluminum silicate, and activated carbon can be used to remove them. Various pigments, colloids, oxides, etc. in oil.
Deodorization section of cooking oil refining machine: main equipment: deodorization tank, deodorization tower
There are some undesired odorous substances in oil, which mainly originate from oil oxidation products. Adopt the method of vacuum distillation, add citric acid, chelate excessive metal ions, and inhibit oxidation. Use the principle of vacuum stripping to remove low-molecular odor substances, free fatty acids, monoglycerides, diglycerides, and sulfur in oil. substances and thermal decomposition products of pigments, etc.
Dewaxing section of cooking oil refining machine: main equipment: crystallization tank, plate and frame filter, refrigerator, etc.
The wax in vegetable oil is mostly contained in the seed coat, shell and germ of vegetable oil. Its solubility in oil is very low, and its melting point is high (78-82 degrees), so it cannot be absorbed by the human body and is difficult to be saponified. Grease dewaxing is a process in which high-melting-point wax and high-melting-point solid fat in oil are separated out by cooling and crystallization, and then removed by filtration or centrifugation. Special reminder: Some precious oils do not contain wax. The dewaxing process is mainly to increase the viscosity of the oil by cooling down, and filter out the trace solids mixed in the oil to ensure the appearance of the bottled oil.
Special reminder for cooking oil refining machines: Oil contains functional active substances useful to human health, such as oryzanol, sterols, vitamin E, squalene, etc. The more thorough the refining, the more these active substances will be lost. Refining, not over-refining.
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