Vapor-Phase (p, ρ, T, x) Behavior and Virial Coefficients for the (Argon + Carbon Dioxide) System

Abstract

A two-sinker magnetic suspension densimeter was used to carry out accurate density measurements on binary mixtures (argon + carbon dioxide) with carbon dioxide mole fractions of 0.50000, 0.49975, and 0.75093. The measurements cover a temperature range from T = (273.15 to 323.15) K with pressures up to 9.1 MPa or the dew-point pressure, whichever was lower. The mixtures were prepared gravimetrically. With all measurement uncertainties in temperature, pressure, density, and composition taken into account, the relative combined expanded uncertainty (k = 2) in density was estimated to be less or equal to 0.033%. Relative deviations of the experimental densities from the GERG-2008 equation of state were within 0.31% for the mixtures with 0.50000 and 0.49975 mole fraction carbon dioxide and up to 1.90% for the mixture with 0.75093 mole fraction carbon dioxide. In contrast, the relative deviations from a recently developed multiparameter equation of state (EOS) optimized for combustion gases (EOS-CG) were less than 0.30% for the three mixtures under study. Third-order virial equations were fitted to the measured density values. The correlated molar masses at different temperatures agreed within less than 0.01% with the molar masses determined from the gravimetric mixture preparation. Values and uncertainties of the second and third virial coefficients as well as of the second interaction virial coefficient were calculated.

Densities, Dielectric Permittivities, and Dew Points for (Argon + Carbon Dioxide) Mixtures Determined with a Microwave Re-entrant Cavity Resonator

“…Ben Souissi et al 16 with a two-sinker densimeter, we estimated a relative combined expanded uncertainty (k = 1.73) in our mixture density of 0.3 %. The results were compared with the equation of state EOS-CG developed by Gernert and Span, with relative deviations between (−0.19 to 0.26) % for the (0.0505 argon + 0.9495 carbon dioxide) mixture and (−0.37 to 0.11) % for the (0.2491 argon +0.7509 carbon dioxide), which is clearly within the uncertainty of 1.0 % reported by the authors of the equation of state.…”

“…The approach reported by Richter and McLinden 35 cannot easily be transferred to this work because while the uncertainty of the mixture preparation can be determined, correcting the uncertainty for sorption effects 36 in this re-entrant cavity system is not trivial. As the surface area and quality (gold plating) of the measuring cell of the present system is similar to that of the two-sinker densimeter used by Ben Souissi et al 16 and by Yang et al 37 for density measurements on exactly the same mixtures, we assume that the expanded uncertainties (k = 2) in the mixture molar masses are also 0.0032 g•mol −1 and 0.0054 g•mol −1 , respectively. We note that the dominant contribution to permittivity measurements made with reentrant cavity resonators is usually associated with the stability of the cavity's dimensions under the cycling of pressure and/or temperature.…”

“…To investigate the likely uncertainty of mixture densities derived from dielectric permittivities using the polarizability mixing rule of Harvey and Prausnitz, the values derived in this work for the (0.2491 argon + 0.7509 carbon dioxide) mixture were compared with the highly accurate two-sinker magneticsuspension densimeter measurements of exactly the same mixture conducted by Ben Souissi et al 16 Generally, the deviations of the mixture densities determined in this work from the values reported by Ben Souissi et al 16 increase with pressure, with the largest relative deviation being approximately 0.3 % at 6.5 MPa. On the basis of this comparison, we estimated a relative combined expanded uncertainty (k = 1.73) in our mixture density of u c (ρ mix (ε mix ,T))/ρ mix = 0.3 %.…”

Measurement and modelling of the vapor–liquid equilibrium of (CO2 + CO) at temperatures between (218.15 and 302.93) K at pressures up to 15 MPa

“…Recently, Coquelet et al [19], Fandiño et al [20], Tsankova et al [21], Ben Souissi et al [22] and Westman et al [23; 24; 25] have studied the VLE of key binary mixtures containing CO2, including (CO2 + Ar), (CO2 + H2), (CO2 + N2) and (CO2 + O2) at temperature and pressure conditions relevant to those encountered in CO2 pipeline transportation and low-temperature CO2 separation processes. Nevertheless, VLE data for binary systems comprising CO2 and toxic gases are still scarce.…”

Dynamic Viscosity of Binary Fluid Mixtures: A Review Focusing on Asymmetric Mixtures

“…This may directly impact the uncertainty in measurement since a subtle change of the sample composition due to mistaken sample handling will distort the measurement result. Thus, maintaining the well-known sample composition within highly accurate synthetic experiments is crucial, which is, however, a challenging task (particularly for sample liquefaction) as shown in many of our experimental studies [67,[70][71][72][73][74][75]. It is striking that a large amount of experimental data is available for the methane + n-decane mixture.…”