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Understanding the Influence of the Alkaline Cation K+ or Na+ in the Regeneration Efficiency of a Biogas Upgrading Unit

Baena-Moreno, Francisco M., Rodríguez-Galán, Mónica, Vega, Fernando, Reina, T. R., Vilches, Luis F. and Navarrete, Benito (2019) Understanding the Influence of the Alkaline Cation K+ or Na+ in the Regeneration Efficiency of a Biogas Upgrading Unit International Journal of Energy Research, 43 (4). pp. 1578-1585.

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Abstract

This paper reveals a regeneration method for a carbonate compound after carbon dioxide (CO2) absorption in a biogas upgrading unit run with caustic mixtures, obtaining precipitated calcium carbonate (PCC) as valuable by-product. This process arises as an alternative to physical regeneration, which is highly energy intensive. This work provides novel insights on the regeneration efficiency of carbonates to hydroxides while also studying the influence of K+ or Na+ in the caustic CO2-trapping solution. The compared parameters were the reaction time, temperature and molar ratio. Moreover, psychochemical characterization of solids was obtained by means of Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray powder diffraction (XRD) and Scanning Electron Microscopy (SEM) images. The results indicate that regeneration efficiencies are slightly lower when potassium is used instead of sodium, but quite acceptable for both of them. The chemical characterization experiments showed the predominance of calcium carbonate. Overall, the results obtained in this study proved that this process is feasible to upgrade biogas through PCC precipitation, which appears to be a promising economically viable process to synergise CCS and CCU.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Baena-Moreno, Francisco M.
Rodríguez-Galán, Mónica
Vega, Fernando
Reina, T. R.t.ramirezreina@surrey.ac.uk
Vilches, Luis F.
Navarrete, Benito
Date : 25 March 2019
Funders : Engineering and Physical Sciences Research Council (EPSRC), Royal Society
DOI : 10.1002/er.4448
Copyright Disclaimer : © 2019 John Wiley & Sons, Ltd. This is the peer reviewed version of the following article: Baena‐Moreno, FM, Rodríguez‐Galán, M, Vega, F, Ramirez‐Reina, T, Vilches, L, Navarrete, B. Understanding the influence of the alkaline cation K+ or Na+ in the regeneration efficiency of a biogas upgrading unit. Int J Energy Res. 2019; 43: 1578– 1585, which has been published in final form at https://doi.org/10.1002/er.4448. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving
Uncontrolled Keywords : Carbon Capture and Utilization; Biogas Upgrading; Precipitated Calcium Carbonate; Caustic Absorption; Biomethane Production
Depositing User : Clive Harris
Date Deposited : 15 Feb 2019 14:33
Last Modified : 29 Jan 2020 02:08
URI: http://epubs.surrey.ac.uk/id/eprint/850442

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