Kinetics of CO₂ desorption from aqueous N-methyldiethanolamine solutions

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• 作者：Hanna Kierzkowska-Pawlak ; ^a ; ^{kierzkow@p.lodz.pl} ; Andrzej Chacuk^a
• 关键词：Gas– ; liquid reaction ; Desorption ; Stirred cell ; Modelling ; CO₂ methyldiethanolamine
• 刊名：Chemical Engineering Journal
• 出版年：2011
• 出版时间：15 March 2011
• 年：2011
• 卷：168
• 期：1
• 页码：367-375
• 全文大小：359 K

文摘

The CO₂ desorption rate from CO₂-loaded aqueous N-methyldiethanolamine solutions was measured using a stirred cell with a flat gas–liquid interface. The measurements were performed in the temperature range of 293.15–333.15 K and amine concentration range of 10–30 wt. % MDEA. Measurements were based on a semibatch isothermal absorption of the gas until the equilibrium state was reached, followed by the desorption, which was initiated by the pressure release in the system. A model of mass-transfer with complex chemical reactions based on the film theory was developed to interpret the experimental results. The model takes into account all reversible chemical reactions occurring in the system. The necessary physiochemical properties were taken from literature. The model predictions have found to be in good agreement with the experimental values of CO₂ desorption rates from CO₂ loaded aqueous MDEA solutions.