Peanut Oil Pressing Process

Turning peanuts into peanut oil goes through a continuous process from raw material preparation to pretreatment, from pretreatment to pressing, and from pressing to refining. Next is the detailed process flow of peanut oil pressing.

Raw material preparation

Peanut is a common crop in China, after years of improved breeding, peanut varieties are diverse, there are raw food type peanuts, common type peanuts, high oleic type peanuts and other varieties of categories, including high oleic type peanuts are rich in a variety of minerals and nutrients, and the oil content rate is generally higher, and therefore is often used to do the peanut oil pressing use. In addition to selecting a good variety of peanuts for oil extraction should also ensure that fresh, no mold.

Second, peanut oil pretreatment

Ready to press the use of peanut seeds, you can pre-treatment of peanut oil. Pretreatment includes shelling, cleaning, crushing, rolling embryo, steaming and frying. (Recommended reading: what is the role of peanut oil pre-treatment process? What are the steps of peanut pretreatment? (_Industry News)

1. Shelling: peanut shells absorb oil, and does not contain oil, remove the peanut shell can reduce the peanut shell to absorb oil, but also can reduce the peanut shell on the wear and tear of the oil equipment.

2. Cleaning: Use vibrating screen, magnetic separator, stone remover to remove all kinds of impurities in peanuts, including soil, dust, broken shells, rust and other impurities, to ensure the cleanliness of peanut raw materials.

3. Crushing: peanut particles are relatively large, easy to uneven heat, in order to ensure that the subsequent stir-frying stage of the peanut uniform preheating, the peanut seeds should be crushed into a uniform size of broken peanuts.

4. Rolling embryo: in order to further destroy the internal cell structure of peanuts, increase the surface area of peanut pressing, can be pressed through the embryo rolling machine will be pressed into a uniform thickness of peanut cake pieces.

5. Steaming and stir-frying: the peanuts are fully stir-fried at 130-150 ℃ to control the moisture content and temperature of the peanuts, so that the peanuts reach a good state of pressing and enhance the flavor of peanut oil.

Third, peanut pressing

After a series of pretreatment process, you can press the peanut oil. Pre-treated peanut seed material is put into the peanut oil press, using physical pressing method, through the press screw and peanut seed material in the chamber of the continuous extrusion friction, peanut oil, from peanut seed material out of the system. If this press is not complete, you can choose multiple presses to extract the remaining peanut oil.

Peanut oil refining

After pressing the peanut oil to enter the supermarket sales, but also need to go through a certain refining and purification process, to remove excessive impurities and harmful substances, to ensure the safety and quality of peanut oil.

Peanut oil refining equipment

1、Filtering: the peanut oil pressed contains some residue residue, not completely removed impurities, need to use the filter to filter out these impurities.

2, degumming: add a certain proportion of concentration of food-grade phosphoric acid in the peanut oil, can remove the gum in the peanut oil.

3, deacidification: peanut itself contains certain free fatty acids, which will affect the taste of peanut oil, add NaOH can remove free fatty acids in peanut oil.

4, decolorization: hot press production of peanut oil because of high temperature heating, peanut oil color is generally darker, decolorization can make the color of peanut oil become bright and light. Decolorization generally use physical decolorant decolorization method, such as adding active white clay to absorb the pigment in peanut oil.

5、Deodorization:During the processing process, due to the heating of various mechanical equipment, peanut oil will produce some small odor molecules, which will affect the flavor and taste of peanut oil, and the use of high-temperature heating in the vacuum process can vaporize these odor molecules.

Through the above process, clear peanut oil can be extracted from peanut raw materials. Refined peanut oil is golden in color and mellow in flavor, and is the first choice for cooking oil.