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Modeling of chemical absorption of CO2 in membrane contactors

机译：膜接触器中二氧化碳的化学吸收模型

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A comprehensive two-dimensional mathematical model was developed for the transport of carbon dioxide through hollow fiber membrane (HFM) contactors in the presence of chemical solvent. The model considered both "partial and complete wetting" conditions where the solvent partially or completely filled the membrane pores. Laminar parabolic velocity profile was used for the solvent flow in the tube side; whereas, the gas flow in the shell side was characterized by Happel's free surface model. Axial and radial diffusion inside the fiber, through the membrane, and within the shell side of the contactor were considered. Experimental data were obtained to validate the model for carbon dioxide removal from CO2/CH4 gas mixture using polypropylene (PP) membrane contactor with monoethanol amine (MEA) and sodium hydroxide (NaOH) solutions as solvents. For CO2-MEA system with "complete wetting" conditions, the modeling predictions were in good agreement with the experimental results for different values of gas and liquid flow rates and temperature. Whereas, for CO2-NaOH system, the experimental data agreed well with the model predications considering 20% wetting for different gas and liquid flow rates and solvent concentrations. The "partial wetting" may be attributed to the presence of large pores in the membrane fibers.
机译：建立了一个综合的二维数学模型，用于在化学溶剂存在下通过中空纤维膜（HFM）接触器传输二氧化碳。该模型考虑了“部分和完全润湿”条件，其中溶剂部分或完全填充了膜孔。层流抛物线速度曲线用于管侧的溶剂流动;而壳侧的气流则由Happel的自由表面模型来表征。考虑了纤维内部，穿过膜以及接触器壳侧的轴向和径向扩散。获得了实验数据，以验证使用聚丙烯（PP）膜接触器，单乙醇胺（MEA）和氢氧化钠（NaOH）溶液作为溶剂从CO2 / CH4气体混合物中去除二氧化碳的模型。对于具有“完全润湿”条件的CO2-MEA系统，模型预测与气体和液体流速和温度的不同值的实验结果非常吻合。而对于CO2-NaOH系统，考虑不同气体和液体流速和溶剂浓度的20％润湿性，实验数据与模型预测吻合得很好。 “部分润湿”可归因于膜纤维中存在大孔。

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