Recent Progress on CO<sub>2</sub> Capture Based on Sterically Hindered Amines: A Review
Rui‐tang Guo, Gang-yue Li, Yu Liu, Weiguo Pan
Abstract
Excessive greenhouse gas emissions have led to a series of environmental problems, such as the increasing greenhouse effect, rising sea levels, and melting glaciers at the poles, threatening the global environment for human existence. In view of this, the development of CO 2 capture technologies with commercialization potential is imperative, as CO 2 is the primary contributor to greenhouse gases. In recent years, chemical absorption techniques founded on sterically hindered amines, such as 2-amino-2-methyl-1-propanol (AMP), have garnered escalating interest owing to their benefits of large absorption capacity and diminished energy consumption for regeneration as compared to traditional amine-based methods. In this review, the steric hindrance effect of a sterically hindered amine and its reaction mechanism with CO 2 are reviewed. Subsequently, sterically hindered amine absorbents are classified into four kinds, single amine absorbents, blended amine absorbents, biphasic amine absorbents, and nonaqueous amine absorbents, and recent advancements in investigating the kinetic and thermodynamic characteristics of carbon dioxide sequestration through the utilization of sterically hindered amine sorbents are comprehensively evaluated. Technical-economic analysis and life cycle assessment of the CO 2 capture processes based on sterically hindered amine absorbents have been comprehensively reviewed. Furthermore, future work for CO 2 capture technologies based on sterically hindered amines is suggested.