Integrated Solvent Design for CO<sub>2</sub> Capture and Viscosity Tuning [electronic resource].

Published: Washington, D.C. : United States. Dept. of Energy, 2017.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description: pages 726-734 : digital, PDF file
Additional Creators: Pacific Northwest National Laboratory (U.S.), United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary

We present novel design strategies for reduced viscosity single-component, water-lean CO₂ capture organic solvent systems. Through molecular simulation, we identify the main molecular-level descriptor that influences bulk solvent viscosity. Upon loading, a zwitterionic structure forms with a small activation energy of ca 16 kJ/mol and a small stabilization of ca 6 kJ/mol. Viscosity increases exponentially with CO₂ loading due to hydrogen-bonding between neighboring Zwitterions. We find that molecular structures that promote internal hydrogen bonding (within the same molecule) and suppress interactions with neighboring molecules have low viscosities. In addition, tuning the acid/base properties leads to a shift of the equilibrium toward a non-charged (acid) form that further reduces the viscosity. Here, based on the above structural criteria, a reduced order model is also presented that allows for the quick screening of large compound libraries and down selection of promising candidates for synthesis and testing.

Report Numbers

E 1.99:pnnl-sa--121494
pnnl-sa--121494

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Published through SciTech Connect.
08/18/2017.
"pnnl-sa--121494"
"AA6510000"
Energy Procedia 114 C ISSN 1876-6102 AM
David C. Cantu; Deepika Malhotra; Phillip K. Koech; David J. Heldebrant; Richard (Feng) Zheng; Charles J. Freeman; Roger Rousseau; Vassiliki -Alexandra Glezakou.

Funding Information

AC05-76RL01830

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