Soybean has low oil yield and in general soybean oil is normally produced by Soybean Oil Extraction Machine with solvents instead of Oil Pressing Machines. Soybean oil production consists of following steps:
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Soybean has low oil yield and in general soybean oil is normally produced by Soybean Oil Extraction Machine with solvents instead of Oil Pressing Machines. Soybean oil production consists of following steps:
1.Cleaning of soybeans
The soybeans are first cleaned, dried and dehulled prior to Oil Extraction Machine. This de-hulling is done by cracking the soybeans and a mechanical separation of the hulls and cracked soybeans.
2.Extraction of Soybean Oil
First the soybeans are cut in flakes which are put in a percolation extractors and immerged with a solvent, normally hexane. Counter flow is used as extraction system because it gives the highest yield. After removing the hexane, the extracted flakes only contain about 1% of soybean oil and is used as livestock meal or to produce food products such as soy protein. The hexane is separated from the soybean oil in evaporators. The evaporated hexane is recovered and returned to the extraction process. The hexane free crude soybean oil is then further purified.
3.Refining Soybean Oil
Soybean Oil out from soybean oil extraction machine is crude oil. It must be put into soybean Oil Refining Machine for further processing. The main equipment of oil refinery is various kinds of vessels and tanks carrying on different tasks with additives. These tasks may include sedimentation/filtering, neutralization (removing free fatty acid), degumming, decolorization (bleaching), deodorization, dewax etc. Different combination of steps and the treating degree of each step result in different grade cooking oil and salad oil. Finally, we get pure soybean oil can eat.
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