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Title: Directed Hydrogen Bond Placement: Low Viscosity Amine Solvents for CO2 Capture

Journal Article · · ACS Sustainable Chemistry & Engineering

Capture of CO2 from power generation is required for its conversion or sequestration. Toward this goal, numerous CO2 capture processes have been developed, with the most widely deployed technology utilizing aqueous solutions of amines. Our group has focused on the design of several classes of water-lean solvents in order to identify molecular-level descriptors to control materials properties such as viscosity and regeneration energy. Large scale molecular simulations have shown that strategic placement of hydrogen bonding and tuning of the acid/base equilibria are critical for controlling viscosity at CO2-rich loadings. Here, we extend these principles to a new class of pyridine-based molecules with a secondary amine functionality for binding CO2. The result is a class of water-lean amines that retain high gravimetric capacity (20%) while exhibiting the lowest CO2-rich viscosities (<150 cP, 40 °C) of any 100% concentrated amine currently known. Additionally, these newly identified solvents exhibit regeneration temperatures as low as 60 °C when applying a polarity swing assisted regeneration, resulting in a solvent that can conceptually absorb and desorb CO2 with only a 20 °C temperature swing.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1527007
Report Number(s):
PNNL-SA-139613
Journal Information:
ACS Sustainable Chemistry & Engineering, Vol. 7, Issue 8
Country of Publication:
United States
Language:
English

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  • Switzer, Jackson R.; Ethier, Amy L.; Flack, Kyle M.
  • Industrial & Engineering Chemistry Research, Vol. 52, Issue 36, p. 13159-13163 https://doi.org/10.1021/ie4018836
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Cited By (4)

Ether-functionalization of monoethanolamine (MEA) for reversible CO 2 capture under solvent-free conditions with high-capacity and low-viscosity journal January 2020
Development of High‐Capacity and Water‐Lean CO 2 Absorbents by a Concise Molecular Design Strategy through Viscosity Control journal November 2019
Efficient non-aqueous solvent formed by 2-piperidineethanol and ethylene glycol for CO 2 absorption journal January 2019
Xe⋯chalcogen aerogen bond. Effect of substituents and size of chalcogen atom journal January 2020

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