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Effects of membrane properties on CO2 desorption from chemical absorbents using a membrane flash process

机译：膜特性对使用膜闪存法从化学吸收剂的二氧化碳解吸的影响

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Chemical absorption method is a major separation technique employed in CCS (Carbon dioxide Capture and Storage). In recent years, a novel process named a membrane flash process for regeneration of the absorbent was developed to realize an energy-saving technology. In this study, the effects of pore size and thickness of microporous hollow fiber membrane on the CO2 desorption rate in the membrane flash process were examined. CO2 desorption experiments were performed using the three purchased microfiltration (MF) membranes with different pore sizes, 0.2, 0.5 and 1.0 μm, and the two microporous hollow fiber membranes made from alumina particles with different thicknesses. A 30 wt%-monoethanolamine (MEA) aqueous solution was used as the chemical absorbent. The MEA solution which absorbed CO2 in advance was fed into the tube side of the hollow fiber and was forced to permeate through the membrane by reducing the pressure on the shell side to 40-1 kPa. The results indicated the CO2 desorption rate increased with decreasing pore size. Also, the thicker membrane showed the greater CO2 desorption rate. The results and observation implied that CO2 desorption occurred not only on the surface of the rich solution falling down along the outer surface of the hollow fiber after permeating through the membrane but inside the pores of the membrane wall. Also, the experimental results supported that the contact of the rich solution with the membrane played an important role in CO2 desorption.
机译：化学吸收法是CCS（二氧化碳捕获和储存）中使用的主要分离技术。近年来，开发了一种名为膜闪光过程的新型工艺，用于实现吸收剂的再生，以实现节能技术。在该研究中，检查了微孔中空纤维膜的孔径和厚度对膜闪蒸过程中的CO2解吸速率的影响。使用具有不同孔径，0.2,0.5和1.0μm的三种购买的微滤（MF）膜，以及由具有不同厚度的氧化铝颗粒制成的两个微孔中空纤维膜进行CO 2解吸实验。使用30wt％-MONOHANOLAMINE（MEA）水溶液作为化学吸收剂。将二氧化碳预先吸收的MEA溶液进料到中空纤维的管侧，并通过将壳侧的压力降低至40-1kPa而被迫通过膜渗透。结果表明CO2解吸速率随着孔径的降低而增加。而且，较厚的膜显示出较大的二氧化碳解吸速率。结果和观察暗示的是，在渗透到膜壁的孔内部后，不仅在沿着中空纤维的外表面上沿着中空纤维的外表面落下的浓溶液的表面而发生的二氧化碳去吸收。此外，实验结果支持富溶液与膜的接触在二氧化碳解吸中发挥着重要作用。

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