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| Effects of adsorbent on the acid reversion and colour reversion of bleached soybean oil |
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| DOI： |
| KeyWord:soybean oil bleaching activated bentonite attapulgite acid reversion colour reversion |
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| Abstract: |
| In order to provide a reference for the oil bleaching process, the neutralized soybean oil was bleached with activated bentonite, attapulgite and their combination, and the acid value and colour of the bleached oil were determined. The effects of bleaching agents on the acid reversion and colour reversion of the bleached oil were analyzed by acid reversion test and colour reversion test. The results showed that the acid value of the bleached oil was positively correlated with the amount of activated bentonite added and the mass fraction of activated bentonite in the compound bleaching agent, and negatively correlated with the amount of attapulgite added. The more the bleaching agent was added, the more obvious the bleaching effect was, but when the dosage of activated bentonite or attapulgite added exceeded 3%, the bleaching effect increased less. As the dosage of activated bentonite or attapulgite added increased, the acid reversion of the bleached oil generally tended to decrease first and then increase. The bleached oil had different degrees of colour reversion, and compared with activated bentonite, the degree of colour reversion was higher with attapulgite. In conculsion, in the oil bleaching process, the degree of acid and colour reversion of the finished oil can be controlled to a certain extent by adjusting the dosage and ratio of bleaching agent added. |
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