What is the purpose and method of oil refining?BTMA
Purpose of oil refining
Oil refining usually refers to the purification of unrefined oil to make it meet the standards of edible or industrial oil. Although most of the unrefined oil is fat, it contains some impurities, which not only affects the edible value and storage, but also brings difficulties to deep processing. However, the purpose of refining is not to remove all impurities in the oil. Remove gossypol, protein, phospholipid, mucus and water harmful impurities such as consumption, storage and industrial production. The beneficial “impurities” such as tocopherol will be retained. Therefore, the purpose of oil refining is to remove unnecessary and harmful impurities in oil products according to different requirements and purposes, and obtain oil products that can meet certain quality standards.
Refining methods
According to the operating characteristics and the choice of raw materials, oil refining methods can be roughly divided into three types: mechanical method, chemical method and physical method.
The above-mentioned refining methods generally cannot be completely separated. Sometimes, one refining method may produce another refining effect. For example, alkali refining (neutralization of free fatty acids) is a typical chemical method. The melanin produced by the neutralization reaction can absorb part of the pigment, mucus and protein, and be separated from the oil. Therefore, alkali refining is accompanied by physical and chemical processes.
Refining is a complex and flexible task. According to the purpose of oil refining, the technical conditions and economic benefits should be considered comprehensively, and the edible oil should be refined by appropriate methods.
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