摘要
CO_2作为最主要的温室气体,其控制与减排已刻不容缓。有机胺化学吸收法脱除烟气中的CO_2是目前公认的最为行之有效的方法之一。传统的有机胺吸收剂(MEA等)由于存在着吸收容量低,腐蚀性强等诸多缺陷,已逐渐被新型高效吸收剂所替代。羟乙基乙二胺(AEEA)是一种潜在的新型高效吸收剂,研究AEEA溶液及其复配溶液吸收CO_2反应动力学,不仅可以揭示吸收过程的反应机理,亦可以为吸收工艺和工业设备的设计提供依据,为其工业化应用奠定基础。在温度298.15K～303.15K、常压条件下,基于快速拟一级反应模式初步研究了AEEA与哌嗪、氨乙基哌嗪复配溶液吸收CO_2的反应动力学,建立了简化的动力学方程。求解了CO_2-AEEA-PZ系统的反应速率常数k_(2.AEEA)~1=10662exp[-(3.525×10~4)/R(1/T-1/298.15)]、k_(2.PZ)=16356exp[-(3.289×10~4)/R(1/T-1/298.15)];同时求解了CO_2-AEEA-AEP系统反应速率常数k_(2.AEEA)~2=12184exp[-(3.221×10~4)/R(1/T-1/298.15)]、k_(2.AEP)=25788exp[-(3.167×10~4)/R(1/T-1/298.15)]。对比 CO_2-AEEA-PZ与CO_2-AEEA-AEP系统的动力学数据,结果表明,少量添加PZ和AEP均能对AEEA溶液吸收CO_2起到一定促进作用。但是PZ的促进作用很微弱,而AEP的促进作用相对较大,效果明显;所得结果可以为AEEA复配溶液药剂筛选及工业应用提供依据。
At present,CO_2 is considered to be the most greenhouse gas,and it is imperative to control and reduce it. Organic amine method of chemical absorption to remove CO_2 from flue gas is one of the most effective way. Traditional organic amine absorbents,such as MEA,have many disadvantages such as low absorption capacity and strong corrosive properties,and have been gradually replaced by new type of high efficiency absorbent. AEEA is a potential new type of highly efficient absorbent,and in this paper,the kinetics of CO_2 absorption by AEEA solution and its composite solution is studied by experimental methods. Using fast pseudo-first-order reaction,a series of experiments were investigated under atmospheric pressure over a range of temperature from 298. 15 K to 313. 15 K,the experimental study on the absorption of CO_2 by AEEA-PZ and AEEA-AEP aqueous solution was carried out. And a simplified kinetic equation is established. The reaction rate constants of CO_2-AEEA-PZ-H_2O system including k_(2.AEEA)~1 and k_(2.PZ),and CO_2-AEEA-AEP-H_2O system including k_(2.AEEA)~2 and k_(2.AEP) are solved. By Comparing the the kinetic datas of CO_2-AEEA-PZ-H_2O system and CO_2-AEEA-AEP-H2 O system,the results show that the addition of PZ and AEP can both promote the absorption of CO_2 by AEEA aqueous solution,and the effect of PZ is weak while the effect of NEP is obvious. The results of this study can provide guidance for the screening of AEEA compound solution and its industrial application.
作者
陆诗建
Lu Shijian(Sinopec Energy and Environmental Engineering Co.,Ltd.,Dongying 257026,China)
出处
《山东化工》
CAS
2018年第7期165-169,177,共6页
Shandong Chemical Industry
