Carbon Capture in Molten Salts

Goal: To further investigate key issues important for the deployment of a new method for extracting CO2 from diluted gas mixtures. The main issue in the project is to find out how to lower the process temperature, keep the high efficiency while lowering the energy consumption in this particular process. Technical content: To establish fundamental physical-chemical data necessary for performing calculations and cosntruction of process equipment. This includes phase equilibria diagrams, studies of kinetics, robustness towards contaminants and environmental aspects. Added value: Provide basic data necessary for construction of a demonstrator. Recent results show that reactivity towards water is suppressed by keeping absorption temperature low and that SO2 is effectively removed by the process. A key challenge has proven to be the supply of large amounts of heat during desorption in industrial scale.

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The project aims to further develop a method for extracting CO2 from diluted gas mixtures at elevated temperatures employing molten salt based liquids as sorbents. Rapid gas-liquid reactions has been shown to ensure high efficiency and selectivity absorb ing CO2 within a wide composition range. The project will address specified issues of fundamental character with key impact on the process´performance and applicability. Of these, the most challenging will be establishing the optimal content of active i ngredients in the liquid. Fundamental knowledge about phase diagrams in the relevant chemical systems will be assessed as well as understanding of the process kinetics. Knowledge about these issues is needed for taking the process to the pilot scale.