Abstract An experimental and numerical analysis is presented to investigate the influence of solvent composition and temperature on mass transfer during soybean oil packed-bed extraction using ethanol/isopropyl alcohol mixtures. A finite volume-based algorithm was implemented to solve a multiscale model, allowing to calculate the oil concentration along the column length and particle radius. This model was coupled with an optimization algorithm to estimate the mass transfer coefficient and the particle effective diffusivity based on the experimental data. Correlations for both parameters were obtained and adjusted, with good fit for all cases, to a general non-linear equation where the solvent composition is used as independent variable. Results show that for ethanol-rich mixtures mass transfer is limited by convection at the solid/liquid interface, while for isopropyl alcohol-rich mixtures, internal diffusion limits the process. An economic analysis considering solvent cost associated with different extraction yields indicate that, in general, isopropyl alcohol is more suitable for low-yield extractions (less than 70%) and ethanol for high-yield extractions.

中文翻译：

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使用乙醇/异丙醇混合物提取大豆油中的传质

摘要 通过实验和数值分析研究了溶剂组成和温度对使用乙醇/异丙醇混合物进行豆油填充床提取过程中传质的影响。实施了基于有限体积的算法来求解多尺度模型，从而可以计算沿柱长和颗粒半径的油浓度。该模型与优化算法相结合，以根据实验数据估算传质系数和颗粒有效扩散率。获得并调整了两个参数的相关性，对所有情况进行了很好的拟合，将溶剂组成用作自变量的一般非线性方程。结果表明，对于富含乙醇的混合物，传质受到固/液界面对流的限制，而对于富含异丙醇的混合物，内部扩散限制了该过程。考虑到与不同提取率相关的溶剂成本的经济分析表明，一般来说，异丙醇更适合低产量提取（低于 70%），乙醇更适合高产量提取。