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| Regeneration of spent white clay and its effect on bleaching of soybean oil |
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| DOI： |
| KeyWord:soybean oil regenerated white clay thermosensitive material pre-bleaching removal rate color reversion |
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| Abstract: |
| The regeneration process of spent white clay was studied by investigating the decoloration rate of soybean oil in the pre-bleaching process. The regeneration process parameters were optimized by single factor experiment as follows: mass ratio of sulfuric acid to spent white clay 3.0∶?1.0, acidification temperature 60?℃, calcination temperature 400?℃, sulfuric acid volume fraction 7%, and acidification time 60 min. And the particles of the regenerated white clay were full with grayish white and good adsorption ability. The regenerated white clay was used in the pre-bleaching of soybean oil, under the conditions of dosage of regenerated white clay 0.7%, bleaching temperature 90?℃, and bleaching time 20 min, the thermosensitive material did not easily decompose, and its removal rate reached 97%. Compared with the soybean oil prepared by the normal process, the dosage of fresh white clay was less, and the color reversion of finished oil could not easily occur under this condition. |
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