Physicochemical comparison of precipitated calcium carbonate for different configurations of a biogas upgrading unit

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Title: Physicochemical comparison of precipitated calcium carbonate for different configurations of a biogas upgrading unit
Authors: Baena-Moreno, Francisco M. | Price, Cameron | Le Saché, Estelle | Pastor Pérez, Laura | Sebastia‐Saez, Daniel | Ramírez Reina, Tomás
Research Group/s: Materiales Avanzados
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Biogas | Carbon capture | Carbon utilization | Chemical analysis | Green chemistry | Precipitation
Knowledge Area: Química Inorgánica
Issue Date: Jul-2019
Publisher: Wiley
Citation: Journal of Chemical Technology and Biotechnology. 2019, 94(7): 2256-2262. doi:10.1002/jctb.6013
Abstract: BACKGROUND: This paper presents a physicochemical comparison of the solid products obtained from two alternative processes that recycle waste sodium carbonate (Na2CO3) solution, which is produced following the absorption of CO2 in a biogas upgrading unit. Chemical regeneration processes offer an attractive alternative to the energetically demanding standard physical methods. In the first process, sodium hydroxide (NaOH) is regenerated as a precipitate from the chemical reaction of Na2CO3 with calcium hydroxide (Ca(OH)2). The second process shows a path to obtain a valuable sodium chloride (NaCl) and calcium carbonate (CaCO3) rich brine from calcium chloride (CaCl2) acting as a precipitant agent. In both processes, precipitated calcium carbonate (PCC) is obtained as the most valuable by‐product, but with varying properties owing to the different origin. RESULTS: The purpose of this work is to analyze physicochemically both variations of PCCs obtained and examine the differences between these solid samples in order to determine which method produces more desirable characteristics in the final product. To this end, Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, X‐ray diffraction (XRD) and scanning electron microscopy (SEM) were employed as characterization methods. The results reflect that both PCCs have a calcite crystal structure, or morph, being as both PCC products originate from CaCl2 that is more similar to commercial calcium carbonate calcite. CONCLUSION: These results confirmed that a pure CaCO3 valuable by‐product can be obtained from a biogas upgrading unit with several industrial applications.
Sponsor: This work was supported by the University of Seville through V PPIT-US. Financial support for this work was also provided by EPSRC grant EP/R512904/1 as well as Royal Society Research Grant RSGR1180353. This work was also partially sponsored by CO2ChemUK through EPSRC grant EP/P026435/1. Furthermore, this work was supported by EMASESA through the NURECCO2 project and Corporación Tecnológica de Andalucía (CTA).
ISSN: 0268-2575 (Print) | 1097-4660 (Online)
DOI: 10.1002/jctb.6013
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2019 Society of Chemical Industry
Peer Review: si
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