Oil bleaching

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Oil bleaching - the process of removing colored substances from the oil using an adsorbent. It is one of the stages of industrial refining of oils.

The color of oil consists mainly of carotenes and chlorophylls. The intensity of the color may be higher when the raw material used in the production was heat treated. Part of the dyes may be partially removed at earlier stages of refining, e.g. deacidification. During the process, residues of soaps and other impurities are eliminated in addition to dyes. The adsorbents used are activated bleaching earths, which are aluminosilicates or activated carbon.

The bleaching process is carried out in devices called bleaches, operating under reduced pressure. An adsorbent is added to the heated oil and the whole is mixed. After a certain time, the whole is filtered, during which the bleaching earth is removed. The oil after this process is bottled into bottles, or is subjected to winterization.

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