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Groundnut Oil Manufacturing Process

Groundnut oil manufacturing process is divided into two methods, the first is mechanical pressing and the second is solvent extraction. Mechanical pressing can extract 85% oil and the remaining oil is extracted by the solvent extraction method. According to mechanical pressing technology, you can divide the peanut oil production process into three phases. These are peanuts preparation, pressing and crude oil refining.

Groundnut Oil Manufacturing Process Flowchart
Groundnut Oil Manufacturing Process

Here are the basic steps to extract the groundnut oil

Step 1: Cleaning

Step 2: Dehulling

Step 3: Cooking

Step 4: Pressing

Step 5: Filtration

Step 1: Cleaning

After harvesting groundnut are received at processing facilities. Batches of harvested peanuts will contain whole peanuts in the shell, some shelled peanuts, and foreign objects (e.g., leaves, nodes, weed seed, etc.). The peanuts are then cleaned using cleaning machine so that oil is not contaminated with foreign materials. Therefore, it helps to preform the extraction process as efficiently as possible.

Step 2: Dehulling

After cleaning, removal of the outer shell is necessary as it does not contain oil. The dehulling process can be done manually by labor, or by use of dehuller to reduce the manpower and shorten production time. The purpose of dehulling before oil pressing is to reduce the absorption of oil by the shell, increase the yield of oil, improve the processing efficiency of the peanut oil processing machine and reduce equipment wear and tear. This oil can also improve cake quality and added value.

Step 3: Cooking

Cooking assists in breaking the cell walls and opens the cells that contain the oil. It also decreases the thickness of the oil so that it flows out more easily. Sometimes, pressing is done without heating it. Oil extracted without heating is called cold press oil.

Step 4: Pressing

The peanuts are transfer by conveyor and fed through the hopper of screw press machine. Continuous transport of material by the screw shaft causes pressure to increase to a level needed, which increases friction inside the screw press and generates heat which lowers viscosity of the oil in the crushed seeds thereby increasing the oil flow rate. The oil and cake are usually collected at the oil outlet and press cake exit /choke gap.


Step 5: Filtration

After pressing, crude peanut oil still remain impurities in the extracted oil. To aid in the removal of the remaining impurities, oil filter press machines are usually employed. The filtration systems are able to remove large and small size particulates, and even water from the oil. Read more : Groundnut Oil Refinery Process

Equipment & Machinery for starting Groundnut Oil Manufacturing Business

Some of very important Groundnut Oil Mill Machinery and Equipment are:

Cost of Groundnut Oil Production Plant

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