Modeling and Kinetic Study on Absorption of CO2 by Aqueous Solutions of N-methyldiethanolamine in a Modified Wetted Wall Column

CIESC Journal ›› 2009, Vol. 17 ›› Issue (4): 571-579.

Modeling and Kinetic Study on Absorption of CO₂ by Aqueous Solutions of N-methyldiethanolamine in a Modified Wetted Wall Column

钱智, 郭锴

Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China

收稿日期:2008-12-10 修回日期:2009-04-17 出版日期:2009-08-28 发布日期:2010-12-30
通讯作者: GUO Kai, E-mail: guok@mail.buct.edu.cn
作者简介:
基金资助:
Supported by China Petroleum&Chemical Corporation(105044)

Modeling and Kinetic Study on Absorption of CO₂ by Aqueous Solutions of N-methyldiethanolamine in a Modified Wetted Wall Column

QIAN Zhi, GUO Kai

Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China

Received:2008-12-10 Revised:2009-04-17 Online:2009-08-28 Published:2010-12-30
Supported by:
Supported by China Petroleum&Chemical Corporation(105044)

摘要/Abstract

摘要： To get more accurate kinetic data of the absorption of CO₂ into aqueous solution of N-methyldiethanolamine,a wetted wall column was modified to more uniformly distribute the liquid on the column surface and gas in the absorbing chamber and change the length of the column.The average liquid film thickness and the liquid-phase mass transfer coefficient were measured,and a correlation for the Sherwood number,Reynolds number and Schmidt number was obtained for the modified wetted wall column.The equilibrium concentrations in chemical reactions were calculated with a minor absolute error for calculating the rate constant more accurately.A mathematical model for the CO₂ absorption was established based on the diffusional mass transfer accompanied with parallel reversible reactions,and the partial differential equation was solved by Laplace transform.An analytical expression for the concentration of carbon dioxide as a function of time and penetration depth in liquid film and the average interphase mass transfer rate was obtained.This model was also used to calculate the rate constant for a second-order reaction,which was in good agreement with reported data.

关键词: absorption, carbon dioxide, N-methyldiethanolamine, kinetics, mass transfer

Abstract: To get more accurate kinetic data of the absorption of CO₂ into aqueous solution of N-methyldiethanolamine,a wetted wall column was modified to more uniformly distribute the liquid on the column surface and gas in the absorbing chamber and change the length of the column.The average liquid film thickness and the liquid-phase mass transfer coefficient were measured,and a correlation for the Sherwood number,Reynolds number and Schmidt number was obtained for the modified wetted wall column.The equilibrium concentrations in chemical reactions were calculated with a minor absolute error for calculating the rate constant more accurately.A mathematical model for the CO₂ absorption was established based on the diffusional mass transfer accompanied with parallel reversible reactions,and the partial differential equation was solved by Laplace transform.An analytical expression for the concentration of carbon dioxide as a function of time and penetration depth in liquid film and the average interphase mass transfer rate was obtained.This model was also used to calculate the rate constant for a second-order reaction,which was in good agreement with reported data.

Key words: absorption, carbon dioxide, N-methyldiethanolamine, kinetics, mass transfer

钱智, 郭锴. Modeling and Kinetic Study on Absorption of CO₂ by Aqueous Solutions of N-methyldiethanolamine in a Modified Wetted Wall Column[J]. CIESC Journal, 2009, 17(4): 571-579.

QIAN Zhi, GUO Kai. Modeling and Kinetic Study on Absorption of CO₂ by Aqueous Solutions of N-methyldiethanolamine in a Modified Wetted Wall Column[J]. , 2009, 17(4): 571-579.

参考文献

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Modeling and Kinetic Study on Absorption of CO₂ by Aqueous Solutions of N-methyldiethanolamine in a Modified Wetted Wall Column

Modeling and Kinetic Study on Absorption of CO₂ by Aqueous Solutions of N-methyldiethanolamine in a Modified Wetted Wall Column

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