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| 工艺软水中氯离子含量对油脂中氯离子、3-氯丙醇酯
和缩水甘油酯含量的影响 |
| 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： |
| 中文关键词: 油脂加工 工艺软水 氯离子 碱炼 脱臭 3-氯丙醇酯 缩水甘油酯 |
| 英文关键词:oil processing process soft water chloride ion alkali refining deodorization 3-monochloro-1,2-propanediol esters glycidyl esters |
| 基金项目:“十三五”国家重点研发计划项目（2016YFD0401405） |
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| 中文摘要: |
| 从不同油脂加工厂采集3个工艺软水样品进行氯离子含量测定，并分别进行油脂精炼，研究软水中氯离子含量对精炼油脂中氯离子、3-氯丙醇酯（3-MCPD酯）和缩水甘油酯（GEs）含量的影响。在油脂浸出生产中采用盐水进行混合油沉降除粕末处理，考察其对浸出毛油中氯离子含量的影响。结果表明：3个工艺软水中氯离子含量为0.746~1 091.205 mg/kg，差异显著；脱胶油和碱炼油中氯离子含量与所用软水中氯离子含量直接相关，碱炼油经水洗后氯离子含量与所用软水中氯离子含量的相关系数为0.996 2；软水中氯离子含量决定了碱炼脱酸和碱炼油水洗过程氯离子的迁移方向和迁移量，氯离子含量低的1号软水碱炼油和水洗油中氯离子含量降低率分别为13.43%和9.33%，氯离子含量高的3号软水碱炼油和水洗油中氯离子含量升高量分别为毛油中含量的0.873倍和3.756倍。脱臭油中3-MCPD酯含量与精炼所用软水中氯离子含量呈正相关，相关系数为0.999 9，采用氯离子含量高的软水对油脂进行精炼，脱臭油中3-MCPD酯含量（16946 mg/kg）约是氯离子含量低的软水精炼后脱臭油中3-MCPD酯含量（2.369 mg/kg）的7倍。GEs含量未显示随所用软水中氯离子含量增加而升高的趋势。采用盐水进行混合油沉降除粕末处理再经蒸发脱溶会造成浸出毛油中氯离子含量升高2.13倍， GEs含量升高1.69倍，3-MCPD酯从未检出升高至0.262 mg/kg。 |
| 英文摘要: |
| 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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