Abstract The present study applies the mathematical model to investigate the physical absorption of CO2, H2S and CH4 from synthetic biogas at high pressure using hollow fiber membrane contactors. Henry’s constants are considered pressure and temperature dependent, while the polarity of H2S is included in the calculation of gas diffusivities. The model was validated with the experimental data using two hollow fiber membranes, i.e., polyvinylidenefluoride (PVDF) and polytetrafluoroethylene (PTFE), to analyze membrane wetting. The effects of pressure and temperature on the CO2 and H2S absorption and CH4 loss were investigated. From the model validation, the experimental results using PVDF and PTFE at 1 bar are in good agreement with non-wetting mode. At elevated pressures, non-wetting mode results correspond with the experimental results using PTFE, while the partially wetting mode well predicts the results of PVDF. The modeling results also indicate that increasing pressure and reducing temperature improves the absorption fluxes of CO2 and H2S, while the CH4 losses in this work are lower than 5.5%.

中文翻译：

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使用中空纤维膜接触器在高压下从合成沼气中物理吸收 CO2 和 H2S：亨利常数和气体扩散率的影响

摘要 本研究应用数学模型来研究使用中空纤维膜接触器在高压下从合成沼气中物理吸收 CO2、H2S 和 CH4。亨利常数被认为与压力和温度有关，而 H2S 的极性包括在气体扩散率的计算中。该模型使用两种中空纤维膜，即聚偏二氟乙烯 (PVDF) 和聚四氟乙烯 (PTFE) 的实验数据进行验证，以分析膜润湿性。研究了压力和温度对 CO2 和 H2S 吸收和 CH4 损失的影响。从模型验证来看，在 1 bar 下使用 PVDF 和 PTFE 的实验结果与非润湿模式非常吻合。在升高的压力下，非润湿模式结果与使用 PTFE 的实验结果一致，而部分润湿模式可以很好地预测 PVDF 的结果。建模结果还表明，增加压力和降低温度提高了 CO2 和 H2S 的吸收通量，而本工作中的 CH4 损失低于 5.5%。