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Experimental investigation on CO2 desorption kinetics from MDEA + PZ and comparison with MDEA/MDEA + DEA aqueous solutions with thermo-gravimetric analysis method
Greenhouse Gases: Science and Technology ( IF 2.2 ) Pub Date : 2021-08-11 , DOI: 10.1002/ghg.2107
Shunji Kang 1, 2 , Zhi Shen 1 , Xizhou Shen 1 , Liuya Fang 1 , Li Xiang 2 , Wenze Yang 3
Affiliation  

The carbon dioxide discharged from fossil fuels combustion products is considered as a major contributor to global warming. The current investigation aimed at CO2 desorption kinetics in 3.25 mol L–1 methyldiethanolamine (MDEA)–0.1 mol L–1 piperazine (PZ) rich amine aqueous solution with thermo-gravimetric analysis (TGA) method under different heating rates of 2.5, 5, 10, and 20 °C min–1. The kinetics parameters were determined by comparison of 40 mechanism functions with thermal analysis kinetic method. The average activation energy E was 59.16 kJ mol–1, preexponential factor A was 5.54 × 108, and the most probable mechanism function was G(α) = [–ln(1 – α)]3/2. In addition, the kinetic parameters of CO2 desorption process from three rich amine aqueous solutions (MDEA, MDEA + diethanolamine(DEA), MDEA + PZ) were compared and the influence of kinetic parameters was further discussed. The desorption rate models of three rich amine aqueous solutions were established and desorption rates were well predicted. The order of desorption rate inferred from desorption rate model was MDEA > MDEA + DEA > MDEA + PZ. The results indicated that TGA combined with thermal analysis kinetics was an effective and quick method with high accuracy, easy operation, and good repeatability for screening absorbents preliminarily in laboratory. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译:

MDEA+PZ 解吸 CO2 动力学实验研究及与 MDEA/MDEA+DEA 水溶液的热重分析比较

从化石燃料燃烧产物中排放的二氧化碳被认为是导致全球变暖的主要因素。目前的研究旨在 通过热重分析 (TGA) 方法在 3.25 mol L –1 甲基二乙醇胺 (MDEA)–0.1 mol L –1哌嗪 (PZ) 富胺水溶液中在 2.5、5 的不同加热速率下进行 CO 2解吸动力学、 10 和 20 °C min –1。动力学参数通过40种机理函数与热分析动力学方法的比较确定。平均活化能E为 59.16 kJ mol –1,指前因子A为 5.54 × 10 8, 最可能的机制函数是 G( α ) = [–ln(1 – α )] 3/2。此外,CO 2的动力学参数比较了三种富胺水溶液(MDEA、MDEA+二乙醇胺(DEA)、MDEA+PZ)的解吸过程,并进一步讨论了动力学参数的影响。建立了三种富胺水溶液的解吸速率模型,并很好地预测了解吸速率。从解吸率模型推断解吸率的顺序是MDEA> MDEA + DEA > MDEA + PZ。结果表明,TGA结合热分析动力学是一种有效、快速、准确度高、操作简便、重复性好的实验室初步筛选吸附剂的方法。© 2021 化学工业协会和 John Wiley & Sons, Ltd.
更新日期:2021-10-14
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