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.
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 7.71×10^15exp（-8755.2/T） m^3/（kmol·s）, 9.63×10^20exp（-13262.4/T） m^3/（kmol·s） and 1.19×10^28exp（-18231.3/T） m^3/（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.
出处
《过程工程学报》
CAS
CSCD
北大核心
2011年第3期422-428,共7页
The Chinese Journal of Process Engineering
关键词
二氧化碳
捕集
动力学
醇胺
carbon dioxide
absorption
kinetics
alkanolamine
