Cottonseed oil can be extracted by pressing and leaching methods. For oil factories with small output, the pressing production line can meet the demand.
However, large-volume cottonseed oil processing, such as oil factories with more than 30 tons, can use pre-pressing and leaching production lines, that is, cottonseeds are pre-pressed, and then the pressed cakes are crushed and sent to leaching equipment to extract the remaining oil.
The advantages of the pre-pressing extraction process are that it can effectively extract oil, increase the oil yield, and has high output, good quality of cake after extraction, convenient equipment operation, less labor force, and reduced production cost. Therefore, for cottonseed oil plants with a daily output of more than 30 tons, the pre-press extraction production line is a good choice.
The workflow of cottonseed oil using the pre-pressing extraction process is as follows:
Cottonseed—cleaning—desolventization—hulling—separation of kernel and shell—rolling—steaming—pre-pressing—leaching—refining
Whether it is oil press or extraction equipment, the cottonseed oil produced must be refined by refining equipment before it can be eaten. The main reasons are as follows:
One is because cottonseed oil contains gossypol, which is a toxic substance that can cause redness and swelling in the human body. Eating wool cotton oil containing more gossypol will cause poisoning, and the patient’s skin will have a severe burning sensation
Gossypol is weakly acidic. In the dephosphorization and deacidification process of refining equipment, it can react with alkali to form water-soluble sodium salt of gossypol, which can be eliminated together with soapstock, so it can react with alkali to form water-soluble sodium salt. The sodium salt of gossypol as an organic solvent can be discharged out of the oil along with the soapstock during alkali refining.
Second, in addition to gossypol, crude oil also contains phospholipids, proteins, and trace elements of peptized impurities, free fatty acids, waxes, and other impurities. It is necessary to remove harmful impurities through refining oil equipment to ensure the edible safety and quality of cottonseed oil. , Extend the storage time of oil. Therefore, untreated wool cotton oil is not edible.
Refined oil equipment
The cottonseed oil refined and removed by the refining equipment has removed toxic substances such as gossypol and can be used for human consumption. Cottonseed oil contains a large amount of essential fatty acids, which can effectively inhibit the rise of cholesterol in the blood and maintain the health of the human body.