Experimental Determination of the Equilibrium Water Content of CO2 at High Pressure and Low Temperature

Quantitative understanding of the water content of pipeline fluids in equilibrium with hydrates is critically important to ensure pipeline flow without hindrance from solid precipitation. This paper focuses on pipelines with CO2-rich fluids in cold environments (such as those in Alaska) and generally in CO2 capture. Since there is considerable question about the available data for the water solubility in CO2 at these conditions, a round-robin testing program was structured by Fluor/Worley Parsons Arctic Solutions to quantitatively establish the water solubility. The goal of the data program was to determine the water solubility in CO2-rich mixtures to estimated uncertainty. This paper presents the data program and evaluates its results through thermodynamic analysis and comparison to available literature data.