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

doi:10.1016/j.cjche.2022.01.025

中国化学工程学报 ›› 2022, Vol. 43 ›› Issue (3): 135-142.DOI: 10.1016/j.cjche.2022.01.025

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

Yihan Yin, Aoqian Qiu, Hongxia Gao, Yanqing Na, Zhiwu Liang

Joint International Center for CO₂ 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

收稿日期:2021-08-15 修回日期:2022-01-05 出版日期:2022-03-28 发布日期:2022-04-28
通讯作者: Hongxia Gao,E-mail:hxgao@hnu.edu.cn;Zhiwu Liang,E-mail:zwliang@hnu.edu.cn
基金资助:
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), and the science and technology innovation Program of Hunan Province(2020RC5032)

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

Yihan Yin, Aoqian Qiu, Hongxia Gao, Yanqing Na, Zhiwu Liang

Joint International Center for CO₂ 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

Received:2021-08-15 Revised:2022-01-05 Online:2022-03-28 Published:2022-04-28
Contact: Hongxia Gao,E-mail:hxgao@hnu.edu.cn;Zhiwu Liang,E-mail:zwliang@hnu.edu.cn
Supported by:
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), and the science and technology innovation Program of Hunan Province(2020RC5032)

摘要/Abstract

摘要： Phase change absorbents for CO₂ 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 CO₂ 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 CO₂ 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 CO₂ loading, gas and liquid flow rates, CO₂ partial pressure, and temperature on the volumetric mass transfer coefficient (K_Ga_V). The research shows that K_Ga_V increases with increasing liquid flow rate and decreases with the increase of lean CO₂ loading and CO₂ partial pressure, while the inert gas flow rate and temperature have little effect on K_Ga_V. In addition, based on the principle of phase change absorption, a predictive equation for the K_Ga_V of MEA-sulfolane in the packed tower was established. The K_Ga_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

Abstract: Phase change absorbents for CO₂ 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 CO₂ 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 CO₂ 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 CO₂ loading, gas and liquid flow rates, CO₂ partial pressure, and temperature on the volumetric mass transfer coefficient (K_Ga_V). The research shows that K_Ga_V increases with increasing liquid flow rate and decreases with the increase of lean CO₂ loading and CO₂ partial pressure, while the inert gas flow rate and temperature have little effect on K_Ga_V. In addition, based on the principle of phase change absorption, a predictive equation for the K_Ga_V of MEA-sulfolane in the packed tower was established. The K_Ga_V obtained from the experiment is consistent with the model prediction, and the absolute average deviation (AAD) is 7.8%.

Key words: monoethanolamine-sulfolane-water, Phase change solution, Mass transfer, Packed tower

Yihan Yin, Aoqian Qiu, Hongxia Gao, Yanqing Na, Zhiwu Liang. Experimental study of the mass transfer behavior of carbon dioxide absorption into ternary phase change solution in a packed tower[J]. 中国化学工程学报, 2022, 43(3): 135-142.

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

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

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