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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.
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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