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| Effect of adsorbent characterization and modification on the removal of 3-monochloropropanol-1,2-diol esters and glycidyl esters from palm oil |
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| DOI：10.19902/j.cnki.zgyz.1003-7969.230292 |
| KeyWord:3-monochloropropanol-1,2-diol esters glycidyl esters adsorbent characterization acid and alkali modification |
| FundProject:国家十四五重点研发计划项目（2021YFD2100302） |
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| Abstract: |
| In order to explore the effect of adsorption on the removal of 3-monochloropropanol-1,2-diol esters (3-MCPDE) and glycidyl esters (GEs) from refined oil, refined palm oil was used as raw material，three types of adsorbents (activated carbon, activated clay, attapulgite)were used for the adsorption and removal of 3-MCPDE and GEs from it, and the removal rates of 3-MCPDE and GEs with different adsorbents were determined. The adsorbent was characterized, the correlation between its inherent characteristic and removal rate was analyzed, and the effect of acid and alkali modification methods on the effectiveness of adsorbent adsorption for the removal of 3-MCPDE and GEs was investigated. The results showed that the three adsorbents and acid and alkali modified adsorbents did not have an effective removal effect on 3-MCPDE. Different adsorbents showed different removal effects on GEs. The removal rate of 9 kinds of activated carbon (1% addition) on GEs was 6.50%-98.57%, of which 2 kinds of activated carbon could effectively control GEs within 1.00 mg/kg. The removal rate of 9 kinds of activated clay (0.1% addition) on GEs was 11.56%-83.72%. The removal rate of 3 kinds of attapulgite (0.5% addition) on GEs was 40.86%-69.64%，and the removal effects were unsatisfactory. Correlation analysis showed that the GEs removal rate showed a highly significant negative correlation with the pH of the activated carbon (p<0.01), a significant positive correlation with the specific surface area, mesopore area, and mesopore volume of the activated carbon(p<0.05), a highly significant negative correlation with the pH of the activated clay and the average pore size (p<0.01), and a significant positive correlation with the activity degree of the activated clay (p<0.05). Acid modification of activated carbon and activated clay could improve the removal rate of GEs, while alkali modification was not conducive to the removal rate of GEs. In actual production, low pH, pore developed activated carbon or low pH, high activity, pore developed activated clay, in addition to appropriate acid modification can be carried out to achieve better removal of GEs from oil. |
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