Chemical absorption using amine-based solvents have proven to be the most studied,as well as the most reliable and efficient technology for capturing carbon dioxide(CO_(2))from exhaust gas streams and synthesis gas in...Chemical absorption using amine-based solvents have proven to be the most studied,as well as the most reliable and efficient technology for capturing carbon dioxide(CO_(2))from exhaust gas streams and synthesis gas in all combustion and industrial processes.The application of single amine-based solvents especially the very reactive monoethanolamine(MEA)is associated with a parasitic energy demand for solvent regeneration.Since regeneration energy accounts for up to threeequarters of the plant operating cost,efforts in its reduction have prompted the idea of using blended amine solvents.This review paper highlights the success achieved in blending amine solvents and the recent and future technologies aimed at increasing the overall volumetric mass transfer coefficient,absorption rate,cyclic capacity and greatly minimizing both degradation and the energy for solvent regeneration.The importance of amine biodegradability(BOD)and low ecotoxicity as well as low amine volatility is also highlighted.Costs and energy penalty indices that influences the capital and operating costs of CO_(2)capture process was also highlighted.A new experimental method for simultaneously estimating amine cost,degradation rate,regeneration energy and reclaiming energy is also proposed in this review paper.展开更多
Revealing the reaction mechanism of CO_(2)absorption by mixed amine solutions can provide theoretical guidance for establishing complex kinetic models.This study investigated the CO_(2)capture mechanisms of blended am...Revealing the reaction mechanism of CO_(2)absorption by mixed amine solutions can provide theoretical guidance for establishing complex kinetic models.This study investigated the CO_(2)capture mechanisms of blended amine systems,specifically 1,6-hexamethyl diamine(HMDA)-N,N-diethylethanolamine(DEEA)and 2-(ethylamino)ethanol(EAE)-1-dimethylamino-2-propanol(1DMA2P),utilizing^(13)C nuclear magnetic resonance(NMR)spectroscopy and quantum mechanical calculations.The^(13)C NMR analysis identified the formation and conversion of species during CO_(2)absorption,while quantum calculations elucidated the reaction energetics.The results indicate that tertiary amines(DEEA or 1DMA2P)facilitate CO_(2)absorption by promoting the desorption of protonated primary amines(HMDA or EAE),thereby enhancing the absorption rate.This research provides insights into the role of tertiary amines in blended systems,guiding the development of efficient and low-energy amine solvents for CO_(2)capture.展开更多
基金The financial supports from the Natural Sciences and Engineering Research Council of Canada(NSERC)to our CO_(2)Capture Research programs at the University of Regina,are gratefully acknowledgedIn addition,this publication was made possible,in parts,by NPRP grant#7-1154-2-433 from the Qatar Na tional Research Fund(a member of Qatar Foundation)+1 种基金The statements made herein are solely the responsibility of the au thorsThe authors also gratefully thank Clean Energy Technologies Research Institute(CETRI)of University of Regina-CANADA,Gas Processing Centre of Qatar University-QATAR,as well as the Petroleum and Petrochemical College of Chulalongkorn University-THAILAND,for their research facility supports.
文摘Chemical absorption using amine-based solvents have proven to be the most studied,as well as the most reliable and efficient technology for capturing carbon dioxide(CO_(2))from exhaust gas streams and synthesis gas in all combustion and industrial processes.The application of single amine-based solvents especially the very reactive monoethanolamine(MEA)is associated with a parasitic energy demand for solvent regeneration.Since regeneration energy accounts for up to threeequarters of the plant operating cost,efforts in its reduction have prompted the idea of using blended amine solvents.This review paper highlights the success achieved in blending amine solvents and the recent and future technologies aimed at increasing the overall volumetric mass transfer coefficient,absorption rate,cyclic capacity and greatly minimizing both degradation and the energy for solvent regeneration.The importance of amine biodegradability(BOD)and low ecotoxicity as well as low amine volatility is also highlighted.Costs and energy penalty indices that influences the capital and operating costs of CO_(2)capture process was also highlighted.A new experimental method for simultaneously estimating amine cost,degradation rate,regeneration energy and reclaiming energy is also proposed in this review paper.
基金support of the National Key R&D Program of China (2024YFB106200)the National Natural Science Foundation of China (NSFC-No.W2512003)
文摘Revealing the reaction mechanism of CO_(2)absorption by mixed amine solutions can provide theoretical guidance for establishing complex kinetic models.This study investigated the CO_(2)capture mechanisms of blended amine systems,specifically 1,6-hexamethyl diamine(HMDA)-N,N-diethylethanolamine(DEEA)and 2-(ethylamino)ethanol(EAE)-1-dimethylamino-2-propanol(1DMA2P),utilizing^(13)C nuclear magnetic resonance(NMR)spectroscopy and quantum mechanical calculations.The^(13)C NMR analysis identified the formation and conversion of species during CO_(2)absorption,while quantum calculations elucidated the reaction energetics.The results indicate that tertiary amines(DEEA or 1DMA2P)facilitate CO_(2)absorption by promoting the desorption of protonated primary amines(HMDA or EAE),thereby enhancing the absorption rate.This research provides insights into the role of tertiary amines in blended systems,guiding the development of efficient and low-energy amine solvents for CO_(2)capture.
