Energy-Efficient CO₂ Capture from Flue Gas by Absorption with Amino Acids and Crystallization with a Bis-Iminoguanidine

Journal Article · Fri May 24 00:00:00 EDT 2019 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/acs.iecr.9b00954· OSTI ID:1528715

Garrabrant, Kathleen A. ^[1]; Williams, Neil J.  ^[1]; Holguin, Erick  ^[1]; Brethome, Flavien M. ^[1]; Tsouris, Costas  ^[1]; Custelcean, Radu  ^[1]

---

1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

In this work, we report a hybrid solvent/solid-state approach to CO₂ separation from flue gas, consisting of absorption with aqueous glycine or sarcosine amino acids, followed by crystallization of the bicarbonate salt of glyoxal-bis(iminoguanidine) (GBIG), and subsequent solid-state CO₂ release from the bicarbonate crystals. In this process, the GBIG bicarbonate crystallization regenerates the amino acid sorbent at ambient temperature, and the CO₂ is subsequently released by mild heating (120 °C) of the GBIG bicarbonate crystals, which results in quantitative regeneration of GBIG. The cyclic capacities measured from multiple absorption–regeneration cycles are in the range of 0.2–0.3 mol CO₂/mol amino acid. The regeneration energy of this hybrid solvent/solid-state approach is 24% and 40% lower than the regeneration energy of benchmark industrial sorbents monoethanolamine and sodium glycinate, respectively. Lastly, as the amino acid sorbent is never heated in the hybrid process, its loss through evaporation or degradation is minimized.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Technology Development (EE-20)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1528715
• Journal Information: Industrial and Engineering Chemistry Research, Vol. 58, Issue 24; ISSN 0888-5885
• Publisher: American Chemical Society (ACS)
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY