Simoni, M., Hanein, T. orcid.org/0000-0002-3009-703X, Woo, C.L. et al. (4 more authors) (2022) Synthesis of Ca(OH)₂ and Na₂ CO₃ through anion exchange between CaCO₃ and NaOH: effect of reaction temperature. RSC Advances, 12 (49). pp. 32070-32081. ISSN 2046-2069
Abstract
The CO₂ released upon calcination of limestone accounts for the largest portion of the emissions from the cement, lime, and slaked lime manufacturing industries. Our previous works highlighted the possibility for a no-combustion decarbonisation of CaCO₃ through reaction with NaOH solutions to produce Ca(OH)₂ at ambient conditions, while sequestrating the process CO₂ in a stable mineral Na₂CO₃·H₂O/Na₂CO₃. In this study, the effect of temperature was assessed within the range of 45–80 °C, suggesting that the process is robust and only slightly sensitive to temperature fluctuations. The proportioning of the precipitated phases Na₂CO₃·H₂O/Na₂CO₃ was also assessed at increasing NaOH molalities and temperatures, with the activity of water playing a crucial role in phase equilibrium. The activation energy (Eₐ) of different CaCO₃ : NaOH : H₂O systems was assessed between 7.8 kJ·mol⁻¹ and 32.1 kJ·mol⁻¹, which is much lower than the conventional calcination route. A preliminary energy balance revealed that the chemical decarbonisation route might be ∼4 times less intensive with respect to the thermal one. The present work offers a further understanding of the effect of temperature on the process with the potential to minimise the emissions from several energy-intensive manufacturing processes, and correctly assess eventual industrial applicability.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022 The Author(s). Published by the Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 03 Jan 2025 11:45 |
Last Modified: | 03 Jan 2025 11:45 |
Published Version: | https://pubs.rsc.org/en/content/articlelanding/202... |
Status: | Published |
Publisher: | Royal Society of Chemistry |
Identification Number: | 10.1039/d2ra05827h |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:221143 |
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