Flue gas CO₂ capture via electrochemically mediated amine regeneration: System design and performance

Journal Article · Wed Sep 18 00:00:00 EDT 2019 · Applied Energy

DOI:https://doi.org/10.1016/j.apenergy.2019.113879· OSTI ID:1646885

Wang, Miao ^[1]; Rahimi, Mohammad ^[2]; Kumar, Amit ^[2]; Hariharan, Subrahmaniam ^[2]; Choi, Wonyoung ^[3]; Hatton, T. Alan ^[2]

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1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); MIT
2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
3. IHI Corporation, Tokyo (Japan)

The electrochemically-mediated amine regeneration (EMAR) process uses electrons to modulate amine capacity to achieve CO2 separation from flue gas as an alternative to the traditional thermal regeneration process for CO2 capture. Here, the EMAR separation scheme is validated in a batch system designed to evaluate efficiency losses. Current and voltage responses of the electrochemical process were analyzed in a flow system operated continuously for up to 50 h. An isothermal EMAR system can achieve separation efficiencies above 80% from a 15% CO2 feed, which is representative of the CO2 composition in a flue gas. This bench scale continuous system can operate at 40–80 kJe/molCO2 with an amine regeneration of between 0.12 and 0.62 molCO2/molamine. The ability to separate CO2 at high electron utilization and moderate electrical energy consumption will prompt future research into optimization of the electrochemical separation unit to obtain long-term and stable operations for flue gas scrubbing.

• Research Organization: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
• Sponsoring Organization: USDOE; USDOE Office of Fossil Energy (FE), Clean Coal and Carbon Management
• Grant/Contract Number: FE0026489
• OSTI ID: 1646885
• Alternate ID(s): OSTI ID: 2325361
• Journal Information: Applied Energy, Journal Name: Applied Energy Vol. 255; ISSN 0306-2619
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CO2 capture
EMAR
Electrochemical desorption
Ethylenediamine
Post combustion