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Bleaching process

Bleaching process

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Bleaching process

 

Bleaching process, prolonged contact with oil at a high temperature air is easy to oxidative deterioration, causing the peroxide value increased, and the oxidation dye to produce a more stable, and therefore must be dried under vacuum bleaching.

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Castor oil, thoroughly rinsed with water after the alkali refining in vacuum and dried under heating. Drying is qualified, stirring constantly transferred bleaching process. When the drying temperature reaches 105 ℃ ~ 110 ℃, vacuum reaches 0.08Mpa ~ 0.094Mpa, castor oil, under normal circumstances lighter color. Castor dry alkali refining, oxidation at higher temperatures a heavier red. Thus using, dried under vacuum with acid clay, activated carbon bleaching, bleaching temperature of 100 ℃ ~ 110 ℃, cooled after completion of bleaching to 70 ℃ ~ 80 ℃ filtered Serve refined castor oil. Degree of vacuum reached 0.08Mpa ~ 0.094Mpa, at a predetermined time of the operating temperature is about 20min.

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