Session: Corrosion in Carbon Capture, Transportation, and Utilization and Storage (CCTUS) (Part II of III)
Chemistry Theory and Threshold Definition for Reactions and Precipitation in Impure CO2 Transport (C2026-00022)
Wednesday, March 18, 2026
1:00 PM - 1:30 PM Central
Location: 342 DE
Earn .5 PDH
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Control the non-corrosive purity of the CO2 is crucial for "CCS hub-projects" that aim to capture CO2 for a wide range of industries. Each CO2 source in combination with its capture process carries their own specific spectrum of impurities. Upon mixing or a change in the conditions, these impurities react and may separate out as solids or a polar phase containing water and reaction products such as H2SO4 and HNO3. Test data has been analysed using chemical equilibrium calculations (CEC) and definition of an equivalent a sulfuric acid concentration Cacid was found to correlate with precipitation. From the CEC the reaction tendency of the composition can be also characterised by oxidizing strength (or tendency), where a minimum is required for acid formation and access of oxygen has shown to affect the Cacid threshold value. Gaps between solubility data from uptake of acid vs formation and precipitation have been identified and attributed to chemical kinetics (incomplete conversion) and phase behaviour kinetics. The paper presents a structured approach to identify the compositional thresholds for acid formation and precipitation for impure CO2 transport. The practical implication of this knowledge is identified and guidance provided for CCS hub projects.
