Synergistic Effects during Physical Refining of Palm Oil to Mitigate the Formation of Monochloropropanediols
2020
Theurillat, Xanthippe | Nicolas, Marine | Redeuil, Karine | Nagy, Kornél
The aim of this study is to assess the synergy of mitigating main chlorine sources in palm oil and the oil refining conditions in a lab‐scale physical refining process. Mitigation concepts including centrifugation and washing steps are integrated into the physical refining protocol and the MCPD levels in the fully refined oils are determined. The endogenous chlorine content of the crude oil and that of the bleaching clay is confirmed to predominantly impact MCPD formation in this refining process. Residual sediments are shown to induce up to 1 ppm MCPD in the fully refined oils. Residual chlorine content of bleaching clay is shown to increase MCPD content of the oil twofold. t‐Test statistical analysis confirms significant effect of centrifugation, phosphoric acid content, clay type and clay washing on the formation of MCPD. Centrifugation is shown to effectively reduce the chlorine source coming from the sediments, while clay washing is shown to effectively reduce the chlorine source coming from the bleaching clay. These mitigation effects are confirmed both in sealed ampoule tests and in deodorizer experiments. Practical Applications: A combined application of strong centrifugation and clay washing is recommended to potentially improve the MCPD content of physically refined palm oil.
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