According to the operating characteristics and the raw materials, oil refining method can be roughly divided into 3 ways which include mechanical refining, chemical refining and physical refining.
Sometimes when we use one of the methods, at the same time can produce another kind of refining effect. such as alkali refining (to neutralize free fatty acid) is a typical chemical refining method. However, soapstock which come from the neutralization reaction can absorb part of the production of pigment, mucus and protein, etc., and separated from oil. So alkali refining is a kind of chemical refining with physical and chemical process.
Oil refining is a complicated and flexible work. Must according to the purpose of oil refining, considering economic benefits and technical conditions, choose appropriate refining method, so that can obtain high quality edible oil.
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