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| Change of chloride ion content in the process of soybean oil adsorptionbleaching and its effect on 3-monochloro-1,2-propanediol esters andglycidyl esters in deodorized oil |
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| DOI： |
| KeyWord:soybean oil adsorption bleaching chloride ion oil deodorization 3-monochloro-1,2-propanediol esters glycidyl esters |
| FundProject:“十三五”国家重点研发计划（2016YFD0401405） |
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| Abstract: |
| According to the chloride ion detection method in soil, the ultrasonic extraction time of chloride ion in common adsorbents for oil bleaching was optimized, and the chloride ion content was detected. The soybean oil was bleached with common adsorbents, and the contents of chlorine ion in the oil before and after bleaching were detected. The deodorization treatment of the bleached oil obtained with different adsorbents was carried out, and the contents of 3-monochloro-1, 2-propanediol esters (3-MCPD esters) and glycidylesters (GEs)in the deodorized oil were also determined. The effects of different adsorbents on the chloride ion contents of bleached oil and on the contents of 3-MCPD esters and GEs in the deodorized oil were analyzed. The results showed that the optimal ultrasonic extraction time was 30 min, the chloride ion content in the ten common adsorbents was 11.93-187.881 mg/kg, and the difference was significant. Different adsorbents also had different degrees of removing chloride ions during the process of oil adsorption bleaching. Among them, YS-900 activated carbon with the best removal effect could reduce the chloride ion in the oil by 83.21%. Compared with the soybean oil which was not subjected to bleaching, the bleached oil was deodorized, and the production amounts of 3-MCPD ester and GEs reduced. Moreover, when the degree of decrease of chloride ion was different after adsorption bleaching, the production of 3-MCPD ester and GEs formation in the deodorized oil were different. When the chloride ion content in bleached oils decreased slightly, the production of GEs in deodorized oils was significantly lower than that of 3-MCPD ester; when the chloride ion content in bleached oils decreased significantly, the production of 3-MCPD ester in deodorized oils was lower than that of GEs. The H-2 activated carbon was the best choice for reducing 3-MCPD ester and GEs production in deodorized oil. |
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