Synergizing carbon capture storage and utilization in a biogas upgrading lab-scale plant based on calcium chloride: Influence of precipitation parameters
2019
Baena-Moreno, Francisco M. | Rodríguez-Galán, Mónica | Vega, Fernando | Reina, T.R. | Vilches, Luis F. | Navarrete Prieto, Benito
Herein a strategy for biogas upgrading in a continuous flow absorption unit using CaCl₂ as capturing agent is reported. This process is presented as an alternative to the standard physical regeneration processes to capture carbon dioxide (CO₂) from biogas effluents with inherent high energy penalties. This work showcases a systematic study of the main parameters (reaction time, reaction temperature, and molar ratio reactant/precipitator) affecting calcium carbonate (CaCO₃) precipitation efficiency in a reaction between sodium carbonate (Na₂CO₃) and CaCl₂. In addition, the purity and main characteristics of the obtained product were carefully analysed via in a combined characterization study using Raman, XRD, and SEM. Our results indicate that acceptable precipitation efficiencies between 62 and 93% can be reached by fine tuning the studied parameters. The characterization techniques evidence pure CaCO₃ in a calcite structure. These results confirmed the technical feasibility of this alternative biogas upgrading process through CaCO₃ production.
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