Accurate (p,ρ,T) data for two new (carbon dioxide plus nitrogen) mixtures from (250 to 400) K at pressures up to 20 MPa

M. E. Mondejar, R. M. Villamanan, R. Span, C. R. Chamorro

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Recently our group published a set of (p,ρ,T) data for two (carbon dioxide + nitrogen) mixtures with a low carbon dioxide content (xCO2 = 0.10, 0.15). These data showed larger relative deviations from the GERG-2008 equation of state than expected, specially at low temperatures, high pressures, and for the mixture with higher carbon dioxide content (xCO2 = 0.15). In order to analyze whether the mentioned deviations from the equation of state increase with the carbon dioxide content, it was decided to measure the (p,rho,T) behavior of two additional mixtures with higher carbon dioxide molar fractions xCO2 = 0.20, 0.50). The new experimental data show again an appreciable disagreement with the GERG-2008 equation of state at low temperatures and high pressures. Relative deviations, which depend on temperature, arise to 0.4% at 250 K and 20 MPa and to 0.24% at 275 K and 20 MPa for the xCO2 = 0.20 and xCO2 = 0.50 mixture, respectively. Second virial coefficients are calculated for the two new mixtures presented in this work and also for those presented in our previous paper.
Original languageEnglish
JournalJournal of Catalysis
Volume48
Pages (from-to)254-259
ISSN0021-9517
DOIs
Publication statusPublished - 2012
Externally publishedYes

Keywords

  • Density measurements
  • CO2/N2 mixtures
  • Single sinker densimeter
  • GERG equation of state

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