Abstract

A dynamic, plug-flow, one-dimensional, and heterogeneous mathematical model for a trickle-bed reactor is described and used to simulate the catalytic hydrocracking of non-edible vegetable oil with countercurrent operation mode. The reactor model considers the hydrocracking reaction of triglycerides towards renewable fuels, which is present in the hydrotreatment process of vegetable oils. The dynamic model was first validated using experimental data reported in the literature, which were obtained in an isothermal micro-scale reactor with cocurrent downflow during hydrocracking of Jatropha oil over a commercial CoMo catalyst. Then, the three-phase reactor model was applied to predict the dynamic behavior of an industrial hydrocracking reactor in order to gain some insight into the transient behavior of the liquid molar concentration, partial pressure, and temperature profiles, which were obtained and discussed as a function of time and axial position of the catalytic bed. The simulations obtained with the proposed dynamic model showed good agreement with the experimental data and trends previously reported for the operation variables profiles at steady-state and relevant findings at industrial scale were obtained.

Graphic abstract

One of the main challenges to produce biofuels by vegetable oils hydroprocessing is to control the high-temperature gradients along the catalyst bed because of the high reaction heat released; therefore, the development of dynamic trickle-bed reactor models, as shown in this work, can be used as a tool to predict the operational behavior of the unit under different reaction conditions and layouts to found the best scheme to control the effects by high-temperature rise.

中文翻译：

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植物油加氢裂化三相反应器的动力学建模与仿真

摘要

描述了滴流床反应器的动态，塞流，一维和非均质数学模型，并用于模拟逆流操作模式下不可食用植物油的催化加氢裂化。该反应堆模型考虑了甘油三酸酯向可再生燃料的加氢裂化反应，该反应存在于植物油的加氢处理过程中。首先使用文献报道的实验数据验证了动力学模型，该实验数据是在等温微型反应器中进行的，其中麻疯树的加氢裂化过程中并流向下流动在商用CoMo催化剂上加油。然后，将三相反应器模型用于预测工业加氢裂化反应器的动态行为，以便对液体摩尔浓度，分压和温度曲线的瞬态行为有所了解，并以此为基础进行讨论。时间和催化床轴向位置的函数。用所提出的动态模型获得的仿真结果与实验数据和先前报道的稳态操作变量曲线的趋势吻合良好，并获得了工业规模的相关发现。

图形摘要

通过植物油加氢处理生产生物燃料的主要挑战之一是控制沿催化剂床层的高温梯度，因为释放的反应热很高。因此，如本工作所示，动态滴流床反应器模型的开发可以用作预测该装置在不同反应条件和布局下的运行行为的工具，从而找到最佳的方案来控制高反应堆的运行。温升。