The basic principles of a steady-state mass transfer model and the resistance-in-series film model are assessed with the aid of a series of experiments in a gas–liquid contact membrane mini-module (3 M Liqui-Cel MM-1.7 × 5.5) using an aqueous solution of diethanolamine (DEA) of 0.25 M (mol/L) for biogas upgrading. Experimental data show that CO₂ removal may exceed 67% and reach 100% in combination with the highest possible recovery of CH₄ when employing biogas flow rates in the range of 2.8 × 10^–5 – 3.6 × 10^–5 m³/s and solvent flow rates within 0.47 × 10^–5 – 0.58 × 10^–5 m³/s. For the experimental data set, a correlation has been developed, effectively interpolating CO₂ removal with the gas and liquid flow rates. The wetting values calculated are concentrated close to each other for the same liquid flow rate without considerably depending on the gas flow rate, especially when applying the Hikita–Yun (reaction rate–shell-side correlation) compared with the Hikita–Costello pair. Furthermore, the calculated wetting diminishes with increasing liquid flow rate, a result that is consistent with previous modeling attempts and relevant literature indications. The assumption of enhanced mass transfer in the liquid-filled part of the membrane pores due to the reaction is scrutinized, leading to objectionable computational wetting values. It is shown that for a concentration of DEA equal to 0.25 M the Hatta numbers and the enhancement factors are not equal in the whole reaction path; thus, the choice of the shell-side correlation has an appreciable impact on the overall analysis, especially for the determination of the wetting values.

中文翻译：

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包括壳程反应在内的气液接触过程中的建模、模拟和膜润湿估算：使用 DEA 解决方案进行沼气升级


借助气液接触膜微型模块（3 M Liqui-Cel MM-1.7 × 5.5)使用0.25M(mol/L)二乙醇胺(DEA)水溶液进行沼气提质。实验数据表明，当沼气流量在 2.8 × 10 < 范围内时，CO ₂ 去除率可超过 67%，并结合 CH ₄ 的最高回收率，去除率可达 100%。 b2> – 3.6 × 10 ^–5 m ³ /s 且溶剂流速在 0.47 × 10 ^–5 – 0.58 × 10 ^–5 /s。对于实验数据集，已经建立了相关性，有效地将 CO ₂ 去除率与气体和液体流量进行插值。对于相同的液体流速，计算出的润湿值彼此接近，而不太依赖于气体流速，特别是与 Hikita-Costello 对相比，应用 Hikita-Yun（反应速率-壳程相关性）时。此外，计算出的润湿性随着液体流速的增加而减小，这一结果与之前的建模尝试和相关文献表明一致。由于反应而导致膜孔的液体填充部分中的传质增强的假设受到仔细审查，导致令人反感的计算润湿值。结果表明，当 DEA 浓度等于 0.25 M 时，整个反应路径中的 Hatta 数和增强因子并不相等；因此，壳程相关性的选择对整体分析有相当大的影响，特别是对于润湿值的确定。