Removal of di‐2‐ethylhexyl phthalate (DEHP) and mineral oil from crude hazelnut skin oil using molecular distillation–multiobjective optimization for DEHP and tocopherol
Different distillation conditions of DEHP were investigated to decrease concentration in hazelnut skin oil. In a short‐path distillation column, different absolute pressures (1–3 mbar) and evaporator temperatures (200–230°C) were used. When distilled at 230°C under 1 mbar of absolute pressure, a reduction of 98.95% of initial DEHP concentration was achieved. At this condition, DEHP concentration was found 0.32 mg/kg. Tocopherols were also removed by molecular distillation inevitably. At 220°C temperature and 3 mbar absolute pressure, total tocopherols were reduced from initial concentration of 780.63–419.24 mg/kg. Since tocopherols were desired to remain in hazelnut skin oil, a multiobjective optimization process was performed. When upper DEHP boundary was set to 1.5 mg/kg, 15 different alternative paths were reached while maximizing total tocopherol amount within pressure‐temperature boundaries. After each molecular distillation, mineral oil content was reduced nearly by sixfold from an initial concentration of 64 mg/kg. Even when distillation temperature was set to 200°C, mineral oil content was drastically reduced to approximately 10 mg/kg level. Practical applications: DEHP is a common contaminant in oil materials packed with plastic packages. Removal of DEHP is of great importance due to negative health impacts. Since tocopherol loss should be kept minimum while processing oil for removal of DEHP, process conditions should be carefully selected. This study reveals optimum molecular distillation conditions for this purpose. These conditions could be evaluated in industrial plants for producing best quality products with maximum tocopherol content as possible. Removal of DEHP and MOSH from crude hazelnut skin oil by molecular distillation.
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