Energetics of electrochemically mediated amine regeneration process for flue gas CO2 capture
Abstract
The electrochemically mediated amine regeneration (EMAR) process presents an alternative route to the conventional thermal regeneration of amines for carbon capture from a flue gas source. In this study, chemical and electrochemical measurements were performed to validate the speciation and activity coefficient models that describe the solution thermodynamics. Electrochemical kinetics and efficiencies were identified and process level energetic calculations were performed using these validated models to understand the effects of various operating parameters on the energy demand for CO2 capture. An isothermal EMAR process requires about 52 kJe/molCO2, and the net energy demand can be reduced to about 37 kJe/molCO2 if waste heat is available at temperatures below 90 °C. The EMAR process is able to desorb CO2 at pressures up to 20 bar with negligible additional energy penalty. These results suggest that the EMAR process is competitive with the conventional thermally regenerated amine processes. Preliminary assessments also indicate the solvent fomulation with NaCl requires less electric energy among other conventional supporting salt candidates (e.g. Na2SO4) for electrolytic processes. Furthermore, advanced process designs, process optimization, and the identification of improved solvents may offer the potential to further reduce the energy demand for CO2 capture.
- Authors:
-
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Fossil Energy (FE), Clean Coal and Carbon Management
- OSTI Identifier:
- 1489146
- Alternate Identifier(s):
- OSTI ID: 1496442; OSTI ID: 1646886
- Grant/Contract Number:
- FE0026489
- Resource Type:
- Accepted Manuscript
- Journal Name:
- International Journal of Greenhouse Gas Control
- Additional Journal Information:
- Journal Volume: 82; Journal Issue: C; Journal ID: ISSN 1750-5836
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; carbon capture; ethylenediamine; absorption; electrochemical; copper
Citation Formats
Wang, Miao, Hariharan, Subrahmaniam, Shaw, Ryan A., and Hatton, T. Alan. Energetics of electrochemically mediated amine regeneration process for flue gas CO2 capture. United States: N. p., 2019.
Web. doi:10.1016/j.ijggc.2018.12.028.
Wang, Miao, Hariharan, Subrahmaniam, Shaw, Ryan A., & Hatton, T. Alan. Energetics of electrochemically mediated amine regeneration process for flue gas CO2 capture. United States. https://doi.org/10.1016/j.ijggc.2018.12.028
Wang, Miao, Hariharan, Subrahmaniam, Shaw, Ryan A., and Hatton, T. Alan. Thu .
"Energetics of electrochemically mediated amine regeneration process for flue gas CO2 capture". United States. https://doi.org/10.1016/j.ijggc.2018.12.028. https://www.osti.gov/servlets/purl/1489146.
@article{osti_1489146,
title = {Energetics of electrochemically mediated amine regeneration process for flue gas CO2 capture},
author = {Wang, Miao and Hariharan, Subrahmaniam and Shaw, Ryan A. and Hatton, T. Alan},
abstractNote = {The electrochemically mediated amine regeneration (EMAR) process presents an alternative route to the conventional thermal regeneration of amines for carbon capture from a flue gas source. In this study, chemical and electrochemical measurements were performed to validate the speciation and activity coefficient models that describe the solution thermodynamics. Electrochemical kinetics and efficiencies were identified and process level energetic calculations were performed using these validated models to understand the effects of various operating parameters on the energy demand for CO2 capture. An isothermal EMAR process requires about 52 kJe/molCO2, and the net energy demand can be reduced to about 37 kJe/molCO2 if waste heat is available at temperatures below 90 °C. The EMAR process is able to desorb CO2 at pressures up to 20 bar with negligible additional energy penalty. These results suggest that the EMAR process is competitive with the conventional thermally regenerated amine processes. Preliminary assessments also indicate the solvent fomulation with NaCl requires less electric energy among other conventional supporting salt candidates (e.g. Na2SO4) for electrolytic processes. Furthermore, advanced process designs, process optimization, and the identification of improved solvents may offer the potential to further reduce the energy demand for CO2 capture.},
doi = {10.1016/j.ijggc.2018.12.028},
journal = {International Journal of Greenhouse Gas Control},
number = C,
volume = 82,
place = {United States},
year = {Thu Jan 10 00:00:00 EST 2019},
month = {Thu Jan 10 00:00:00 EST 2019}
}
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