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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Model Study on Transesterification of Soybean Oil to Biodiesel with Methanol Using Solid Base Catalyst
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Model Study on Transesterification of Soybean Oil to Biodiesel with Methanol Using Solid Base Catalyst

机译：固体碱催化大豆油与甲醇酯交换为生物柴油的模型研究

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摘要

Modeling of the transesterification of vegetable oils to biodiesel using a solid base as a catalyst is very important because the mutual solubilities of oil and methanol will increase with the increasing biodiesel yield. The heterogeneous liquid-liquid-solid reaction system would become a liquid-solid system when the biodiesel reaches a certain content. In this work, we adopted a two-film theory and a steady state approximation assumption, then established a heterogeneous liquid-liquid-solid model in the first stage. After the diffusion coefficients on the liquid-liquid interface and the liquid-solid interface were calculated on the basis of the properties of the system, the theoretical value of biodiesel productivity changing with time was obtained. The predicted values were very near the experimental data, which indicated that the proposed models were suitable for the transesterification of soybean oil to biodiesel when solid bases were used as catalysts. Meanwhile, the model indicated that the transesterification reaction was controlled by both mass transfer and reaction. The total resistance will decrease with the increase in biodiesel yield in the liquid-liquid-solid stage. The solid base catalyst exhibited an activation energy range of 9-20 kcal/mol, which was consistent with the reported activation energy range of homogeneous catalysts.
机译：使用固体碱作为催化剂对植物油向生物柴油的酯交换反应进行建模非常重要，因为油和甲醇的互溶性将随着生物柴油产量的增加而增加。当生物柴油达到一定含量时，异质液-液-固反应体系将变成液-固体系。在这项工作中，我们采用两层理论和稳态近似假设，然后在第一阶段建立了非均质的液-液-固模型。根据系统的性质计算了液-液界面和液-固界面上的扩散系数，得出了生物柴油生产率随时间变化的理论值。预测值与实验数据非常接近，表明当固体碱用作催化剂时，提出的模型适用于大豆油向生物柴油的酯交换反应。同时，该模型表明酯交换反应受传质和反应控制。在液-液-固阶段，总阻力将随着生物柴油产量的增加而降低。固体碱催化剂的活化能范围为9-20 kcal / mol，与报道的均相催化剂的活化能范围一致。

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