Corn oil extraction machine
Corn oil, also known as corn germ oil, is an oil extracted from corn germ. The fat content of corn germ is between 17-45%. The fatty acid in corn oil is characterized by unsaturated fatty acid content as high as 80-85%. Corn oil has a dissolving effect on cholesterol in the blood, so it can reduce the hardening effect on blood vessels.
Process flow of corn germ to corn crude oil
Corn germ → cleaning → drying/softening → flaking → steaming → oil pressing → crude oil → derefining ↓
To extraction→meal→feed
crafting process:
Cleaning of corn oil extraction machine: The corn germ recovered from corn grits or alcohol production is mixed with more corn flour, crushed flour and dander, which needs to be screened with a double-layer vibrating sieve. The mesh of the sieve surface, the first layer removes large impurities; the second layer removes corn flour, broken grits and dander to reduce the loss of corn germ.
Drying of corn oil extraction machine: In order to maintain the freshness of wet-extracted corn germ during storage and transportation, the cleaned corn germ must be sun-dried or dried to a moisture content below 10%.
Softening of corn oil extraction machines: the first process of making oil from corn germ. In this process, the moisture content of the corn germ is reduced to less than 10% while the corn germ is being heat-treated, so that the embryo undergoes plastic changes. Hot air dryer or hot steam roller dryer is commonly used for softening. During softening, the temperature of the raw material should not rise too quickly, so as to prevent the premature denaturation of protein and make the raw material lose its elasticity, which will affect flaking, steaming and oil pressing. deal with.
Flaking of corn oil extraction machine: After the corn germ is softened, it is rolled into 0.3-0.4mm thin slices by a roller flaking machine, which promotes the destruction of the cell structure, shortens the oil circuit, and facilitates the steaming and pressing of the embryo. .
Steaming and frying of corn oil extraction machine: the raw material enters the steaming and frying equipment for steaming and frying, and is heated for 40-50 minutes. Finally, the temperature of the raw material exceeds 100°C, and the moisture content of the raw material is gradually reduced to 3%-4%. The color gradually changes to brownish red, and the aroma can be smelled without burning.
Or adopt the way of puffing, and the obtained puffed material enters the press machine to obtain better quality crude oil and cake.
The oil extraction method of the corn oil extraction machine includes pressing method and extraction method. The pressing method adopts screw pressing and hydraulic pressing.
The type of oil press can be determined according to the production scale. For a slightly larger production plant, the 200-type screw oil press can be selected. This machine has a large output, low cake residue, and continuous operation.
The produced corn germ oil, unrefined, commonly known as "crude oil", has 0.3% moisture and volatile substances, 0.2% impurities, 6% acid value, 6% sediment, light yellow color and normal smell, and is heated at 280°C , a precipitate precipitated out.
"Crude oil" is not resistant to storage due to its high content of moisture and impurities. It needs to be refined by hydration, alkali refining and deodorization to obtain high-quality refined corn oil.
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