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| 废白土再生及其对大豆油脱色的影响 |
| Regeneration of spent white clay and its effect on bleaching of soybean oil |
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| DOI： |
| 中文关键词: 大豆油 再生白土 热敏物质 预脱色 脱除率 返色 |
| 英文关键词:soybean oil regenerated white clay thermosensitive material pre-bleaching removal rate color reversion |
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| 中文摘要: |
| 以再生白土对大豆油预脱色的脱色率为指标，对废白土再生的工艺进行研究。采用单因素试验优化了废白土再生工艺参数为液固比3.0∶?1.0（硫酸与废白土质量比）、酸化温度60?℃、焙烧温度400?℃、硫酸体积分数7%、酸化时间60 min，优化后的再生白土颗粒饱满，呈灰白色，吸附性好。将再生白土应用于大豆油预脱色中，在再生白土添加量07%、脱色温度90?℃、脱色时间20 min条件下，热敏物质不易分解，其脱除率达97%。与正常工艺制备的大豆油相比，新白土添加量较少，且此条件下的成品油不易返色。 |
| 英文摘要: |
| 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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