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Absorption Kinetics of CO_2 in Aqueous Solutions of Secondary and Tertiary Alkanolamines

LI Wei-bin, Dong Li-hu, Jian Chen

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Abstract

The absorption rates of CO2 into aqueous solutions were measured with a wetted wall column. A secondary alkanolamine diethanolamine and two tertiary alkanolamines, triethanolamine and N,N-diethylethanolamine, were used in the experiments at various concentrations and temperatures. Their intrinsic reaction rate constants with CO2 are 7.71-1015exp(-8755.2/T) m3/(kmol-s), 9.63-1020exp(-13262.4/T) m3/(kmol-s) and 1.19-1028exp(-18231.3/T) m3/(kmol-s), respectively. It is determined that the absorption mechanisms of alkanolamines with CO2 are zwitterion mechanism in secondary alkanolamines and modified base-catalyzed hydration mechanism in tertiary alkanolamines.

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What this paper is about

The absorption rates of CO2 into aqueous solutions were measured with a wetted wall column. A secondary alkanolamine diethanolamine and two tertiary alkanolamines, triethanolamine and N,N-diethylethanolamine, were used in the experiments at various concentrations and temperatures. Their intrinsic reaction rate constants with CO2 are 7.71-1015exp(-8755.2/T) m3/(kmol-s), 9.63-1020exp(-13262.4/T) m3/(kmol-s) and 1.19-1028exp(-18231.3/T) m3/(kmol-s), respectively. It is determined that the absorption mechanisms of alkanolamines with CO2 are zwitterion mechanism in secondary alkanolamines and modified base-catalyzed hydration mechanism in tertiary alkanolamines.

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Available abstract

The absorption rates of CO2 into aqueous solutions were measured with a wetted wall column. A secondary alkanolamine diethanolamine and two tertiary alkanolamines, triethanolamine and N,N-diethylethanolamine, were used in the experiments at various concentrations and temperatures. Their intrinsic reaction rate constants with CO2 are 7.71-1015exp(-8755.2/T) m3/(kmol-s), 9.63-1020exp(-13262.4/T) m3/(kmol-s) and 1.19-1028exp(-18231.3/T) m3/(kmol-s), respectively. It is determined that the absorption mechanisms of alkanolamines with CO2 are zwitterion mechanism in secondary alkanolamines and modified base-catalyzed hydration mechanism in tertiary alkanolamines.

Key concepts: Alkanolamine, Diethanolamine, Triethanolamine, Chemistry, Zwitterion, Aqueous solution, Kinetics, Absorption (acoustics)

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