Enrichment of light gas components in CO2 liquefaction and transport process for industrial gas streams

Accurate thermodynamic data for CO 2 mixtures containing light gas components are essential for the safe and efficient design of CO 2 liquefaction and transport processes in carbon capture, utilization, and storage (CCUS) applications. This study presents an experimental investigation of CO 2 mixtures containing light gas components (N 2 , CH 4 , H 2 , and Ar) under conditions relevant to liquefaction and ship transport (−50 °C and −30 °C, 7–20 bar). Vapor–liquid equilibrium (VLE) measurements demonstrated pronounced vapor enrichment of light gas components across all binary and ternary mixtures, with hydrogen exhibiting the lowest solubility and the greatest influence on phase behavior. Obtained experimental data were compared with the predicted results from thermodynamic models, among which GERG-2008 and CPA equation of state showed the best agreement, yielding average absolute deviati…