Synergizing Carbon Capture Storage and Utilization in a Biogas Upgrading Lab-scale Plant Based on Calcium Chloride: Influence of Precipitation Parameters

Description

Herein a strategy for biogas upgrading in a continuous flow absorption unit using CaCl 2 as capturing agent is reported. This process is presented as an alternative to the standard physical regeneration processes to capture carbon dioxide (CO 2 ) 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 (CaCO 3 ) precipitation efficiency in a reaction between sodium carbonate (Na 2 CO 3 ) and CaCl 2 . 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 CaCO 3 in a calcite structure. These results confirmed the technical feasibility of this alternative biogas upgrading process through CaCO 3 production.

Abstract

Engineering and Physical Sciences Research Council EP/R512904/1, EP/P026435/1

Abstract

Royal Society RSGR1180353

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