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Peanut is a kind of oilseed with high oil content. The oil can be obtained from peanuts by pressing process.
Groundnut oil contains more than 80% unsaturated fatty acids (including 41.2% oleic acid and 37.6% linoleic acid). Besides, there are also palmitic acid, stearic acid, and other saturated fatty acids which cover 19.9%. The fatty acid composition of peanut oil is relatively good, therefore it is easy for human bodies to digest and absorb. Thus, the peanut oil production industry is a large and highly developed business.
| Project name | capacity | suitable for raw material |
| oil pressing production line | 10--800t/d | sunflower seed, soybean, peanut, sesame, corn germ, tea seed, rapeseed, cottonseed, etc |
| oil solvent-extracting production line | 30--800t/d | pressed oil cake, soybean flakes, rice bran pallet, etc. |
| oil refining production line | 3--500t/d | all kinds of vegetable oil, animal oil, etc. |
| palm oil mill production line | 5t/h--90t/h | palm fruit bunch |
| oil fractionation production line | 20--500t/d | refined palm oil |
| Oilseeds protein, phospholipids | 50--500t/d | soybean meal, etc. |
| Natural pigment extraction production line | 30--500t/d | piment, vegetable , etc |
| grain deep processing line | 20--1000t/d | corn, wheat, beans, etc. |
The peanut pressing processes can be divided into three stages, which are the feeding stage, the main pressing stage, and the cake forming stage. The most common groundnut oil pressing machine is the screw oil press.
Hot pressing is the traditional method of pressing peanut oil. With a high rate of oil output, good taste, and convenient storage, it is popular for home use. However, because of the high production temperature, the peanut protein is usually severely denatured and loses plenty of nutrients.
Cold pressing technology is often applied in large peanut oil production plants. The production temperature is conducted under 60ºC, which is beneficial to preserve the nutrients and comprehensively utilize peanut protein in groundnut oil. The disadvantage is low oil yield, not suitable for small oil plants.
The pressed groundnut meal cakes can be used as animal feed, or the residual oil can be further extracted through the extraction process.
After a long period of precipitation, the crude peanut oil can be filtered by a filter and sent to a refining plant. The pressed cake can be crushed and sent to an extraction plant for secondary extraction, extraction oil is refined and sold as ordinary oil.
Refining is to remove impurities, odors, and pigments from groundnut oil and improve the quality and taste of the oil. The refining process mainly includes steps such as degumming, deacidification, decolorization, and deodorization.
Degumming mainly removes phospholipids and other colloidal substances from peanut oil. By heating and adding chemical reagents, colloidal substances such as phospholipids are aggregated into larger particles, which are then removed by centrifugation or filtration.
The purpose of deacidification is to reduce the free fatty acid content in groundnut oil. Alkaline refining or distillation is usually used for deacidification. The alkali refining method is to add an appropriate amount of alkali solution to neutralize the free fatty acids to generate soap stock and glycerol, and then remove the soap stock through centrifugation or filtration.
Decolorization mainly removes pigments from groundnut oil to make the color of the oil clearer. The adsorption decolorization method is usually used, that is, adsorbents such as activated carbon are used to absorb pigments and other impurities in the oil.
The purpose of deodorization is to remove odors and volatile substances from peanut oil and improve the taste and stability of the oil. Deodorization usually uses high-temperature vacuum distillation, under high temperature and vacuum conditions, the odor components in peanut oil are volatilized and removed through condensation collection.
During the deacidification and deodorization process, free fatty acids and low molecular weight substances are distilled out under high-temperature vacuum and direct steam conditions. The physical refining deodorization temperature is higher than the conventional temperature. Generally around 260 degrees. During the operation, attention should be paid to rapid temperature rise, balancing the flow of the inlet to be deodorized and the finished oil, and strictly controlling the deodorization time, etc. This is directly related to the technological level of oil refining equipment.
The refined groundnut oil is cooled, filled, and sealed through automated packaging equipment for storage and sale.
The fully automatic groundnut oil production line is a production line that integrates the latest technology and intelligent technology, aiming to improve production efficiency, ensure product quality, and meet market demand. The production line adopts fully automatic control, realizing full automation from the peanut raw materials entering the factory to the finished products leaving the factory, greatly reducing manual intervention and operating errors.
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