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A Process Intensification Approach for CO 2 Absorption Using Amino Acid Solutions and a Guanidine Compound

Author

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  • Abishek Kasturi

    (Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
    School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA)

  • Jorge F. Gabitto

    (Department of Chemical Engineering, Prairie View A&M University, Prairie View, TX 77446, USA)

  • Radu Custelcean

    (Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA)

  • Costas Tsouris

    (Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
    School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA)

Abstract

Environmentally friendly amino-acid salt solutions are used for the absorption of carbon dioxide from concentrated flue-gas streams via chemical absorption. Process intensification reduces operating and capital costs by combining chemical reactions and separation operations. Here, we present a new process-intensification approach that combines the CO 2 capture and the amino-acid regeneration steps into a single process carried out in a slurry three-phase reactor. The absorbed CO 2 precipitates as a solid carbonated guanidine compound. The cycle is completed by separation of the solid precipitate to strip the CO 2 and regenerate the guanidine compound, while the liquid solution is recycled to the slurry reactor. The process was studied by modifying a model developed by the authors for a gas-liquid bubble column without the presence of the guanidine compound. The guanidine precipitation reaction was accounted for using kinetic parameters calculated by the authors in another study. The proposed model was implemented by modifying an existing computer code used for the simulation of gas-liquid bubble columns. The calculated results showed that the proposed cycle can significantly reduce energy, equipment, and operating costs and can make an important contribution to developing a competitive cost-effective large-scale process for CO 2 capture.

Suggested Citation

  • Abishek Kasturi & Jorge F. Gabitto & Radu Custelcean & Costas Tsouris, 2021. "A Process Intensification Approach for CO 2 Absorption Using Amino Acid Solutions and a Guanidine Compound," Energies, MDPI, vol. 14(18), pages 1-15, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:18:p:5821-:d:635514
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    References listed on IDEAS

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    1. Flavien M. Brethomé & Neil J. Williams & Charles A. Seipp & Michelle K. Kidder & Radu Custelcean, 2018. "Direct air capture of CO2 via aqueous-phase absorption and crystalline-phase release using concentrated solar power," Nature Energy, Nature, vol. 3(7), pages 553-559, July.
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