Influence of CO2 concentration on capturing costs using different solvents

“We find that CESAR1’s capture cost, excluding transport and storage, is very close to current EU emission trading scheme (ETS) prices for most relevant flue gas CO2 concentrations, and breaks even with the US §45Q tax-credit at high gas CO2 concentrations (see Fig. 5). Overall, the differences in capture costs between the real solvents are small, which is unsurprising given the similar chemistry and consistently high contents of ∼90 mol% water. The capture cost of advanced solvents like CESAR1 is still similar to the capture cost of MEA, and far from the limiting solvent. Evidently, only a small cost improvement has been achieved over >100 years of solvent R&D.”


Fig. 5. Capture cost of the solvents representing different amine classes, CESAR1 (performance benchmark), and the limiting solvent for flue gas CO2 compositions between 1 mol% and 30 mol%. Tax credit US §45Q and EU ETS are added for reference. The available potential for cost reductions through solvent improvement is highlighted in grey (based on the current performance benchmark CESAR1).”

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