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| Influence of chloride ion content in process soft water on contents of chloride ion, 3-monochloro-1,2-propanediol esters and glycidyl esters in oil |
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| DOI： |
| KeyWord:oil processing process soft water chloride ion alkali refining deodorization 3-monochloro-1,2-propanediol esters glycidyl esters |
| FundProject:“十三五”国家重点研发计划项目（2016YFD0401405） |
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| Abstract: |
| Three process soft water samples from different oil processing plants were collected, and their chloride ion contents were detected. The three soft water samples were used to refine oil, and the effects of chloride ion content in soft water on the contents of chloride ion, 3-monochloro-1,2-propanediol (3-MCPD) esters and glycidyl esters (GEs) in refined oil were studied. In the oil leaching production, salt water was used to settle the miscella to remove the meal powder, and the effect of salt water on the chloride ion content in crude oil was investigated. The results showed that the chloride ion contents in the three soft water samples were 0.746-1 091.205 mg/kg, which was a huge difference. The chloride ion content in the oil after degumming and alkali refining was directly related to the soft water used. The chloride ion content in the neutralized oil after washing was linearly related to the soft water used, and the correlation coefficient was 0996 2. The content of chloride ion in soft water determined the migration direction and amount of chloride ion during alkali refining and washing. The reduction rates of chloride ion contents in the oils after alkali refining and washing using No. 1 soft water with low chloride ion content were 13.43% and 9.33% respectively, while the increase of chloride ion contents in the oils after alkali refining and washing using No. 3 soft water with high chloride ion content were 0.873, 3.756 times of that in crude oil. The 3-MCPD esters content in the oil after deodorization was positively correlated with the chloride ion content in the soft water used for refining, with a linear correlation coefficient of 0.999 9. The 3-MCPD esters content in the deodorized oil using soft water with high chloride ion content was 16.946 mg/kg, which was seven times of that in the deodorized oil (2.369 mg/kg) using soft water with low chloride ion content. The content of GEs in the deodorized oil did not increase with the increase of chloride ion content in the soft water. In the oil leaching production, the contents of chloride ion and GEs increased by 2.13 times and 1.69 times respectively, and the 3-MCPD esters content increased from undetected to 0262 mg/kg after salt water treatment to settle the miscella to remove the meal powder and desolvation with evaporation. |
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