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Dynamic acid/base equilibrium in single component switchable ionic liquids and consequences on viscosity

Journal Article · · Journal of Physical Chemistry Letters
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  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
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The deployment of transformational non-aqueous CO2-capture solvent systems is encumbered by high viscosity even at intermediate uptakes. Using single-molecule CO2 binding organic liquids as a prototypical example, we identify the key molecular features controlling bulk liquid viscosity and CO2 uptake kinetics. Fast uptake kinetics arise from close proximity of the alcohol and amine sites that are involved in CO2 binding. This process results in the concerted formation of a Zwitterion containing both an alkylcarbonate and a protonated amine. The hydrogen bonding between the two functional groups ultimately determines the solution viscosity. Based on molecular simulation, this work reveals options to significantly reduce viscosity with molecular modifications that shift the proton transfer equilibrium towards a neutral acid/amine species as opposed to the ubiquitously accepted Zwitterionic state. Lastly, the molecular design concepts proposed here, for the alkyl-carbonate systems, are readily extensible to other CO2 capture technologies, such as the carbamate- or imidazole-based solvent chemistries.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1254559
Report Number(s):
PNNL-SA--114453; AA6510000
Journal Information:
Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 9 Vol. 7; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Development of High‐Capacity and Water‐Lean CO 2 Absorbents by a Concise Molecular Design Strategy through Viscosity Control journal November 2019
A call to (green) arms: a rallying cry for green chemistry and engineering for CO 2 capture, utilisation and storage journal January 2018
Assessing the impacts of dynamic soft-templates innate to switchable ionic liquids on nanoparticulate green rust crystalline structures journal January 2019

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CO2 capture solvent systems
ab Initio molecular dynamics
classical molecular dynamics
switchable ionic liquids
viscosity