The phase equilibrium and density studies of the ternary mixtures of CO2 + Ar + N2 and CO2 + Ar + H2, systems relevance to CCS technology. (January 2017)

• Record Type: Journal Article
• Authors: Ke, Jie; Suleiman, Norhidayah; Sanchez-Vicente, Yolanda; Murphy, Thomas S.; Rodriguez, Javier; Ramos, Alfredo; Poliakoff, Martyn; George, Michael W.
• Is Part Of: International journal of greenhouse gas control. Volume 56(2017)
• Page Start: 55
• Page End: 66
• Publication Date: 2017-01
• Subjects: Carbon capture and storage -- Carbon dioxide -- Argon -- Nitrogen -- Hydrogen -- Vapour-liquid equilibrium -- Density -- Equation of state; Greenhouse gases -- Environmental aspects -- Periodicals; Air -- Purification -- Technological innovations -- Periodicals; Gaz à effet de serre -- Périodiques; Gaz à effet de serre -- Réduction -- Périodiques; Air -- Purification -- Technological innovations; Greenhouse gases -- Environmental aspects; Periodicals; 363.73874605
• DOI: 10.1016/j.ijggc.2016.11.003
• Languages: English
• ISSNs: 1750-5836

Abstract

Highlights: New vapour-liquid equilibrium and density data of ternary mixtures for CCS processes. Bubble-point pressures increase substantially for dilute CO2 /Ar/H2 mixtures. GSAFT gives excellent predictions of the bubble-point pressures of CO2 mixtures containing H2 . Abstract: The p-T phase diagrams of two ternary systems (CO2 + Ar + N2 and CO2 + Ar + H2 ) have been measured at temperatures between 268 and 303 K using a fibre-optic phase equilibrium analyser. CO2, which is the major component, has a mole fraction ranging from 0.90 to 0.98 in both systems. The molar ratio of the two minor components is Ar:N2 = 1:1 and Ar:H2 = 2:3, respectively for the two ternary systems. In addition, the density of a ternary mixture with x Ar = 0.050 and x N2 = 0.050 is reported at 293.15 K, 303.15 K, 313.15 and 333.15 K and pressures up to 23 MPa. The new experimental phase equilibrium and density data have also been used to evaluate the GERG-2008/EOS-CG, gSAFT and Peng-Robinson equations of state. Among these equations, EOS-CG exhibits the best predictions on both the p-T phase diagrams and densities of CO2 + Ar + N2 ; and gSAFT gives the lowest average absolute deviation between the predicted and the measured bubble-point pressures of CO2 + Ar + H2 .