搅拌式反应器用于测定乙醇胺溶液吸收CO_(2)动力学研究  

Study on the kinetics of CO_(2)absorption using MEA solution in stirred tank reactor

作　　者：吴思 赫佳琳 唐思扬 钟山 鲁厚芳[1,2] 梁斌 WU Si;HE Jialin;TANG Siyang;ZHONG Shan;LU Houfang;LIANG Bin(School of Chemical Engineering,Sichuan University,Chengdu 610065,China;Institute of New Energy and Low Carbon Technology,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]四川大学新能源与低碳技术研究院,四川成都610065

出　　处：《应用化工》2025年第2期322-329,335,共9页Applied Chemical Industry

摘　　要：有机胺化学吸收法是常见的二氧化碳捕集方法,其吸收动力学是工业反应器的设计基础。化学反应动力学的测定耗时长,且测试数据受实验装置影响较大。搭建了一套可自动控制的搅拌式动力学测试装置,考察了不同搅拌速率下5 mol/L乙醇胺(MEA)的水溶液吸收CO_(2)的动力学。在200~850 r/min搅速下,施伍德准数和二级反应速率常数与湿壁塔接近,动力学拟合数据可以用于填料塔和降膜式反应器的设计;在1000~1500 r/min搅速下,液相湍流程度加剧,部分气体被卷入液相主体,动力学拟合数据可以用于搅拌鼓泡式反应器的设计。吸收过程可以分为三个阶段,即传质控制段、传质-反应共同控制段和反应控制段,其中工业应用5 mol/L的MEA水溶液进行CO_(2)捕集时的有效吸收负荷范围基本位于传质-反应共同控制段。The organic amine chemical absorption method is a common approach for carbon dioxide capture,and its absorption kinetics are the basis for the design of industrial reactors.However,determining the chemical reaction kinetics is time-consuming,and test data are heavily influenced by the experimental setup.A set of automatically controlled stirring kinetic test device was established to investigate the kinetics of CO_(2)absorption by 5 mol/L ethanolamine(MEA)solution at different stirring rate:At stirring speeds of 200~850 r/min,the Sherwood number and the second-order reaction rate constant are close to the wet-wall tower,and the kinetic fitting data can be used for the design of packed tower and falling film reactor.At stirring speeds of 1000~1500 r/min,the turbulence of the liquid phase intensifies and some gases are involved in the liquid phase.The kinetic fitting data can be used for the design of the stirred bubble reactor.The absorption process can be divided into three stages,namely mass transfer control stage,mass transfer-reaction co-control stage and reaction control stage.For industrial applications,the effective absorption load range when using 5 mol/L MEA aqueous solution for CO_(2)capture is basically located in the mass transfer-reaction co-control stage.

关 键 词：动力学 二氧化碳 吸收 乙醇胺 

分 类 号：TQ028.8[化学工程]