Reinventing Design Principles for Developing Low-Viscosity Carbon Dioxide-Binding Organic Liquids for Flue Gas Clean Up.

Autor: Malhotra D; Energy Processes and Materials Division, Pacific Northwest National Laboratory, Richland, WA, 99352, USA., Koech PK; Energy Processes and Materials Division, Pacific Northwest National Laboratory, Richland, WA, 99352, USA., Heldebrant DJ; Energy Processes and Materials Division, Pacific Northwest National Laboratory, Richland, WA, 99352, USA., Cantu DC; Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99352, USA., Zheng F; Energy Processes and Materials Division, Pacific Northwest National Laboratory, Richland, WA, 99352, USA., Glezakou VA; Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99352, USA., Rousseau R; Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99352, USA.
Jazyk: angličtina
Zdroj: ChemSusChem [ChemSusChem] 2017 Feb 08; Vol. 10 (3), pp. 636-642. Date of Electronic Publication: 2017 Jan 11.
DOI: 10.1002/cssc.201601622
Abstrakt: Anthropogenic CO 2 emissions from point sources (e.g., coal fired-power plants) account for the majority of the greenhouse gases in the atmosphere. Water-lean solvent systems such as CO 2 -binding organic liquids (CO 2 BOLs) are being developed to reduce the energy requirement for CO 2 capture. Many water-lean solvents such as CO 2 BOLs are currently limited by the high viscosities of concentrated electrolyte solvents, thus many of these solvents have yet to move toward commercialization. Conventional standard trial-and-error approaches for viscosity reduction, while effective, are time consuming and economically expensive. We rethink the metrics and design principles of low-viscosity CO 2 -capture solvents using a combined synthesis and computational modeling approach. We critically study the effects of viscosity reducing factors such as orientation of hydrogen bonding, introduction of higher degrees of freedom, and cation or anion charge solvation, and assess whether or how each factor affects viscosity of CO 2 BOL CO 2 capture solvents. Ultimately, we found that hydrogen bond orientation and strength is the predominant factor influencing the viscosity in CO 2 BOL solvents. With this knowledge, a new CO 2 BOL variant, 1-MEIPADM-2-BOL, was synthesized and tested, resulting in a solvent that is approximately 60 % less viscous at 25 mol % CO 2 loading than our base compound 1-IPADM-2-BOL. The insights gained from the current study redefine the fundamental concepts and understanding of what influences viscosity in concentrated organic CO 2 -capture solvents.
(© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
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