Effect of solvent on CO2 absorption performance in the microchannel
Effect of solvent on CO2 absorption performance in the microchannel
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DOI：
10.1016/j.molliq.2022.119133
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发表时间：
2022-04
影响因子：
6
通讯作者：
Yaran Yin;Weiyang Chen;Xingxing Zhu;Chunying Zhu;Taotao Fu;Xianming Zhang;Youguang Ma
中科院分区：
文献类型：
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作者：
Yaran Yin;Weiyang Chen;Xingxing Zhu;Chunying Zhu;Taotao Fu;Xianming Zhang;Youguang Ma
在T形结微通道中，考察和比较了2-氨基-2-甲基-1-丙醇(AMP)溶液与溶剂水、乙二醇(EG)、二甘醇(DEG)和三甘醇(TEG)混合后对CO2的吸收性能。用在线照相法测定了不同液体流量(10-40mL.h−-1)、气液流量比(0.5-10)和AMP浓度(0.2-0.8nmol.L-1)下的吸收速率。对弹状流中气泡和弹状流长度、气膜厚度、弹状流中回流频率、气膜-弹状流交换和压降等动力学特性进行了分析和讨论。结果表明，溶剂对吸收率的影响顺序为：AMP-水：AMP-EG：：AMP-DEG：：AMP-TEG：与其溶解度相反。在较高的溶剂粘度下，压降增大、气泡变短、膜厚增加是影响吸收速率的主要因素，它们分别增加了CO2的浓度驱动力和膜-弹状传质。在目前的条件下，综合考虑吸收速率和能耗，水是一个很好的候选溶剂。本研究为微反应器中CO2吸收的溶剂选择和操作提供了指导。
The absorption performances of CO2into 2–amino–2–methyl–1–propanol (AMP) solutions mixed with solvents water, ethylene glycol (EG), diethylene glycol (DEG), and triethylene glycol (TEG) were investigated and compared in a T–junction microchannel. The absorption rate under different liquid flow rates (10–40 ml·h−1), gas/liquid flow rate ratios (0.5–10) and AMP concentrations (0.2–0.8 mol·L–1) was determined by the online photographic method. The dynamics (bubble and slug lengths, film thickness, recirculation frequency in slug, film–slug exchange and pressure drop) in the slug–flow region were analyzed and discussed. The results show that solvents affect the absorption rate with the order of AMP–water < AMP–EG < AMP–DEG < AMP–TEG, which is opposite to their solubility. The increased pressure drop and shorter bubble surrounded with thicker film are the dominant factors affecting the absorption rate, which increase the concentration driving of CO2and film–slug mass exchange at the higher solvent viscosity respectively. Under current conditions, water is a good solvent candidate by joint consideration of absorption rate and energy consumption. This study provides guidance for solvent selection and manipulation of CO2absorption in the microreactor.