The extraction of peanut oil can be divided into cold pressing and hot pressing. Below I will show you the two methods of extracting peanut oil.
1. Clean up
The peanut cleaning process is the process of removing impurities. The removal of impurities is beneficial to storage and transportation, improves the quality of grease and oil yield, and reduces equipment wear. We will remove the rocks, soil, stems and leaves contained in the peanuts. The impurity content must not exceed 0.2%. When cleaning peanuts, we often use a flat rotary sieve to clean peanuts.
2. Peeling
Peanut kernels are peeled, so that the peeling rate can reach 98%, and the peeling can increase the oil yield of oilseeds.
3. Broken
Peanut crushing is to increase the surface area of the oil, which is conducive to softening and increasing the oil yield. The particle size of peanut crushing requires 6-8 petals, and the moisture content is controlled between 7%-12%.
4. Rolling embryo
The function of the rolling embryo is to increase the surface area of the oil, which is easy to squeeze, and the oil yield is high. During the rolling process, the thickness of the embryo is required to be less than 0.5mm.
5. Steam and stir-fry
The function of steaming and frying: (1) Destroy the cell structure of fats (2) Denature protein (3) Improve the quality of fats and cakes, and increase the oil yield
The requirements for steaming and frying: (1) Stir-fry until 80% cooked (2) Steam and stir-fry for 1.5-2 hours (3) The temperature is about 120 degrees (4) The water content is about 3% during steaming and frying.
Steaming and frying equipment: drum roaster
6. Squeeze oil
When the oil is pressed at a temperature of about 85 degrees, it starts to press, and a round-row screw press is used to press the oil.
7. Filter oil
Commonly used machines for filtering are plate and frame oil filter, vacuum oil filter and air pressure oil filter. The plate and frame oil filter is often recommended, which is cheap, easy to use, and clean.
