(591j) Thermodynamic Modeling of Acid Solubility in Dense Phase CO2

CO₂ transportation pipelines are prone to corrosion because of the presence of impurities. Some impurities may react and produce strong acids like nitric and sulfuric acids, potentially causing significant issues such as strong pitting and localized corrosion in the transportation and storage systems by creating an acid-rich phase. Acid-rich phase gets formed when the acids exceed their solubility limit in dense phase CO₂. While technologies exist to decrease impurities’ concentrations in CO₂ streams, total elimination of these impurities is costly and not feasible for the carbon capture and sequestration process. Experimental data on the solubilities of nitric and sulfuric acids in dense phase CO₂ is scarce. Hence, thermodynamic models of acid solubility in dense phase CO₂ are important.

In this work, I will present the results from thermodynamic modeling of nitric and sulfuric acid solubility in dense-phase CO₂ at different temperatures and pressures.