Integrated Solvent Design for CO2 Capture and Viscosity Tuning

David C. Cantu, Deepika Malhotra, Phillip K. Koech, David J. Heldebrant, Richard Zheng, Charles J. Freeman, Roger Rousseau, Vassiliki Alexandra Glezakou

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)


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. 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. Published by Elsevier Ltd.

Original languageEnglish
Pages (from-to)726-734
Number of pages9
JournalEnergy Procedia
Publication statusPublished - 2017
Event13th International Conference on Greenhouse Gas Control Technologies, GHGT 2016 - Lausanne, Switzerland
Duration: Nov 14 2016Nov 18 2016


  • CO capture solvents
  • reduced model
  • viscosity

ASJC Scopus subject areas

  • Energy(all)

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