Experimental study of the mass transfer behavior of carbon dioxide absorption into ternary phase change solution in a packed tower  

作　　者：Yihan Yin Aoqian Qiu Hongxia Gao Yanqing Na Zhiwu Liang 

机构地区：[1]Joint International Center for CO_(2)Capture and Storage(iCCS),Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing Carbon-dioxide Emissions,College of Chemistry and Chemical Engineering,Hunan University,Changsha 410082,China

出　　处：《Chinese Journal of Chemical Engineering》2022年第3期135-142,共8页中国化学工程学报（英文版）

基　　金：The National Natural Science Foundation of China(NSFC-Nos.22138002,22078083,and 21978075);the Hunan Key R&D Program Project(2020NK2015);National Key R&D Projects in Changsha(kh2005018);National Key Research&Development Program-Intergovernmental International Science and Technology Innovation Cooperation Project(2021YFE0112800);the science and technology innovation Program of Hunan Province(2020RC5032)。

摘　　要：Phase change absorbents for CO_(2)are of great interest because they are expected to greatly reduce the heat energy consumption during the regeneration process.Compared with other phase change absorbents,monoethanolamine(MEA)-sulfolane-water is inexpensive and has a fast absorption rate.It is one of the most promising solvents for large-scale industrial applications.Therefore,this study investigates the mass transfer performance of this phase change system in the process of CO_(2)absorption in a packed tower.By comparing the phase change absorbent and the ordinary absorbent,it is concluded that the use of MEA/sulfolane phase change absorbent has significantly improved mass transfer efficiency compared to a single MEA absorbent at the same concentration.In the 4 mol·L^(-1)MEA/5 mol·L^(-1)sulfolane system,the CO_(2)loading of the upper liquid phase after phase separation is almost zero,while the volume of the lower liquid phase sent to the desorption operation is about half of the total volume of the absorbent,which greatly reduces the energy consumption.This study also investigates the influence of operating parameters such as lean CO_(2)loading,gas and liquid flow rates,CO_(2)partial pressure,and temperature on the volumetric mass transfer coefficient(K_(G)α_(V)).The research shows that K_(G)α_(V) increases with increasing liquid flow rate and decreases with the increase of lean CO_(2)loading and CO_(2)partial pressure,while the inert gas flow rate and temperature have little effect on K_(G)α_(V).In addition,based on the principle of phase change absorption,a predictive equation for the K_(G)α_(V) of MEA-sulfolane in the packed tower was established.The K_(G)α_(V) obtained from the experiment is consistent with the model prediction,and the absolute average deviation(AAD)is 7.8%.

关 键 词：Monoethanolamine-sulfolane-water Phase change solution Mass transfer Packed tower 

分 类 号：TQ421[化学工程] X701[环境科学与工程—环境工程]