Heterogeneously catalyzed epoxidation of vegetable oils by hydrogen peroxide represents a greener route for the production of epoxides and a thermally safer reaction route compared to the classical Prileschajew epoxidation approach. The epoxidation kinetics of the heterogeneous system formed by aluminium oxide catalyst, hydrogen peroxide and methyl oleate as a model compound was studied with semibatch experiments in laboratory scale. It was found that semibatch operation improved the performance significantly compared to classical batch operation, a low and constant volumetric flowrate of hydrogen peroxide increased the final oxirane yield considerably. A semibatch reactor model and a kinetic model were developed, featuring the reaction temperature, the reactant molar ratio, the catalyst loading and the mass flow rate as the most significant experimental parameters. The mathematical model was able to well describe the experimental data. The approach can be applied to other liquid-solid catalyst systems in future in order to optimize the semibatch operation policy for complex reaction systems.

中文翻译：

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使用半间歇式反应器技术研究反应机理和动力学：脂肪酸酯的多相催化环氧化

与经典的 Prileschajew 环氧化方法相比，过氧化氢对植物油的多相催化环氧化代表了更环保的环氧化物生产路线和热安全反应路线。通过实验室规模的半间歇实验研究了由氧化铝催化剂、过氧化氢和油酸甲酯作为模型化合物形成的多相体系的环氧化动力学。发现与经典的间歇操作相比，半间歇操作显着提高了性能，过氧化氢的低且恒定体积流量显着提高了最终环氧乙烷产量。建立了半间歇反应器模型和动力学模型，以反应温度、反应物摩尔比、催化剂负载和质量流量作为最重要的实验参数。数学模型能够很好地描述实验数据。该方法将来可以应用于其他液固催化剂体系，以优化复杂反应体系的半间歇操作策略。