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›› 2011, Vol. 11 ›› Issue (3): 422-428.

• 过程与工艺 • Previous Articles     Next Articles

Absorption Kinetics of CO2 in Aqueous Solutions of Secondary and Tertiary Alkanolamines

LI Wei-bin DONG Li-hu CHEN Jian   

  1. The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University
  • Received:2011-04-11 Revised:2011-05-03 Online:2011-06-20 Published:2011-06-20
  • Contact: LI Wei-bin

仲胺和叔胺水溶液吸收CO2的动力学

李伟斌 董立户 陈健   

  1. 清华大学化学工程国家重点实验室 清华大学化学工程国家重点实验室 清华大学化学工程国家重点实验室
  • 通讯作者: 李伟斌

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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.

Key words: carbon dioxide, absorption, kinetics, alkanolamine

摘要： 采用湿壁柱装置，以二乙醇胺、三乙醇胺和N,N-二乙基乙醇胺水溶液为吸收剂，测量了不同醇胺浓度和不同温度下醇胺吸收CO2的反应速度，得到3种吸收剂吸收CO2的本征反应速率常数分别为7.71′1015exp(-8755.2/T) m3/(kmol×s), 9.63′1020exp(-13262.4/T) m3/(kmol×s), 1.19′1028exp(-18231.3/T) m3/(kmol×s). 确定仲胺吸收CO2的反应机理为两性离子机理，叔胺吸收CO2的反应机理为改进的碱催化水合机理.

关键词: 二氧化碳, 吸附, 动力学, 醇胺

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