A Study on CO2 Absorption Kinetics by Aqueous Solutions of N,N‐Diethylethanolamine and N‐Ethylethanolamine
A Study on CO2 Absorption Kinetics by Aqueous Solutions of N,N‐Diethylethanolamine and N‐Ethylethanolamine
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DOI：
10.1002/ceat.200800573
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发表时间：
2009-04
影响因子：
2.1
通讯作者：
Prakash D. Vaidya;E. Kenig
中科院分区：
文献类型：
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作者：
Prakash D. Vaidya;E. Kenig
N-乙基乙醇胺(EEA) 和N,N-二乙基乙醇胺(DEEA) 是用于从气流中去除CO 2 的有前途的候选烷醇胺，因为它们可以由可再生资源制备。在这项工作中，CO 2 和 EEA 之间反应的反应速率常数是通过测量包含 DEEA、EEA 和 H 2 O 的混合物中 CO 2 的吸收速率来确定的。具有平面、水平气液界面的搅拌池反应器用于吸收研究。虽然配制溶液中的DEEA浓度在1.5-2.5kmol/m 3 的范围内变化，但初始EEA浓度为0.1kmol/m 3 。 EEA 的两性离子机理和 DEEA 的碱催化水合机理用于描述反应动力学。在303 K 下，CO 2 与EEA 反应的二级反应速率常数为8041 m 3 /(kmol s)。还估计了液体侧传质系数，其值（0.004 cm/s）与搅拌池反应器的典型值一致。
N-Ethylethanolamine (EEA) and N,N-diethylethanolamine (DEEA) represent promising candidate alkanolamines for CO 2 removal from gaseous streams, as they can be prepared from renewable resources. In this work, the reaction rate constant for the reaction between CO 2 and EEA was determined from the absorption rate measurements of CO 2 in a blend comprising DEEA, EEA and H 2 O. A stirred-cell reactor with a plane, horizontal gas-liquid interface was used for the absorption studies. While the DEEA concentration in the formulated solution was varied in the range of 1.5-2.5 kmol/m 3 , the initial EEA concentration was 0.1 kmol/m 3 . A zwitterion mechanism for EEA and a base-catalyzed hydration mechanism for DEEA were used to describe the reaction kinetics. At 303 K, the second-order reaction rate constant for the CO 2 reaction with EEA was found to be 8041 m 3 /(kmol s). The liquid-side mass transfer coefficient was also estimated, and its value (0.004 cm/s) is in line with those typical of stirred-cell reactors.