Tailoring Chemical Absorption-Precipitation to Lower the Regeneration Energy of a CO2 Capture Solvent

Jang, Gyoung Gug; Jung, Gang Seob; Seo, Jiho; Keum, Jong K.; Yoon, Mina; Damron, Josh T.; Naskar, Amit K.; Custelcean, Radu; Kasturi, Abishek; Yiacoumi, Sotira; Tsouris, Costas

doi:10.1002/cssc.202300735

Title: Tailoring Chemical Absorption-Precipitation to Lower the Regeneration Energy of a CO₂ Capture Solvent

Journal Article · 08 September 2023 · ChemSusChem

DOI: https://doi.org/10.1002/cssc.202300735 · OSTI ID:2224201

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Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Georgia Institute of Technology, Atlanta, GA (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Georgia Institute of Technology, Atlanta, GA (United States)

Solvent-based CO₂ capture consumes significant amounts of energy for solvent regeneration. To improve energy efficiency, this study investigates CO₂ fixation in a solid form through solvation, followed by ionic self-assembly-aided precipitation. Based on the hypothesis that CO₃^2- ions may bind with monovalent metal ions, we introduced Na⁺ into an aqueous hexane-1,6-diamine solution where CO₂ forms carbamate and bicarbonate. Then, Na⁺ ions in the solvent act as a seed for ionic self-assembly with diamine carbamate to form an intermediate ionic complex. The recurring chemical reactions lead to the formation of an ionic solid from a mixture of organic carbamate/carbonate and inorganic sodium bicarbonate (NaHCO₃), which can be easily removed from the aqueous solvent through sedimentation or centrifugation and heated to release the captured CO₂. Mild-temperature heating of the solids at 80–150 °C causes decomposition of the solid CO₂-diamine-Na molecular aggregates and discharge of CO₂. This sorbent regeneration process requires 6.5–8.6 GJ/t CO₂. It was also found that the organic carbamate/carbonate solid, without NaHCO₃, contains a significant amount of CO₂, up to 6.2 mmol CO₂/g-sorbent, requiring as low as 2.9–5.8 GJ/t CO₂. In conclusion, molecular dynamic simulations support the hypothesis of using Na⁺ to form relatively less stable, yet sufficiently solid, complexes for the least energy-intensive recovery of diamine solvents compared to bivalent carbonate–forming ions.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Compute and Data Environment for Science (CADES)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2224201

Journal Information:: ChemSusChem, Journal Name: ChemSusChem Journal Issue: 2 Vol. 17; ISSN 1864-5631

Publisher:: ChemPubSoc EuropeCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CO2 fixation
Solid precipitation
Solvent regeneration
Solvent-based CO2 capture

Title: Tailoring Chemical Absorption-Precipitation to Lower the Regeneration Energy of a CO2 Capture Solvent

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Title: Tailoring Chemical Absorption-Precipitation to Lower the Regeneration Energy of a CO₂ Capture Solvent