Speed-of-sound measurements in (argon + carbon dioxide) over the temperature range from (275 to 500) K at pressures up to 8 MPa

Abstract

The speed of sound of two (argon + carbon dioxide) mixtures was measured over the temperature range from (275 to 500) K with pressures up to 8 MPa utilizing a spherical acoustic resonator. The compositions of the gravimetrically prepared mixtures were (0.50104 and 0.74981) mole fraction carbon dioxide. The vibrational relaxation of pure carbon dioxide led to high sound absorption, which significantly impeded the sound-speed measurements on carbon dioxide and its mixtures; pre-condensation may have also affected the results for some measurements near the dew line. Thus, in contrast to the standard operating procedure for speed-of-sound measurements with a spherical resonator, non-radial resonances at lower frequencies were taken into account. Still, the data show a comparatively large scatter, and the usual repeatability of this general type of instrument could not be realized with the present measurements. Nonetheless, the average relative combined expanded uncertainty (k = 2) in speed of sound ranged from (0.042 to 0.056)% for both mixtures, with individual state-point uncertainties increasing to 0.1%. These uncertainties are adequate for our intended purpose of evaluating thermodynamic models. The results are compared to a Helmholtz energy equation of state for carbon capture and storage applications; relative deviations of (−0.64 to 0.08)% for the (0.49896 argon + 0.50104 carbon dioxide) mixture, and of (−1.52 to 0.77)% for the (0.25019 argon + 0.74981 carbon dioxide) mixture were observed.

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

“…Figure shows a comparison of our mixture densities with other experimental ( p , ρ, T , x ) data for the (0.0505 argon +0.9495 carbon dioxide) mixture and the (0.2491 argon + 0.7509 carbon dioxide) mixture with comparable data found in the literature. ,,,, The literature data considered are in a temperature range within ±10 K of the present work, at pressures up to 8 MPa and have a composition range within ±0.05 CO 2 mole fraction of the current measurements. The experimental mixture densities reported by Yang et al (two-sinker magnetic suspension densimeter) for a (0.0505 argon + 0.9495 carbon dioxide) mixture at T = (273.15, 283.15, 293.15, 308.15 and 323.15) K and pressures up to 9.0 MPa agree with the EOS-CG within 0.18 %.…”

“…The experimental mixture densities reported by Yang et al (two-sinker magnetic suspension densimeter) for a (0.0505 argon + 0.9495 carbon dioxide) mixture at T = (273.15, 283.15, 293.15, 308.15 and 323.15) K and pressures up to 9.0 MPa agree with the EOS-CG within 0.18 %. The experimental data for a (0.2491 argon + 0.7509 carbon dioxide) mixture plotted in Figure (panel b), reported by Ben Souissi et al (two-sinker magnetic suspension densimeter) at T = (273.15, 283.15, and 293.15) K and pressures up to 9.0 MPa as well as by Wegge (single-sinker magnetic suspension densimeter) T = (273.15 and 283.15) K with pressures up to 20.0 MPa, are in excellent agreement with the EOS-CG 1 . In contrast, the data reported by Sarashina et al (glass capillary cell) for a (0.248 argon + 0.752 carbon dioxide) mixture show large deviations from the equation of state of up to 1.26 %.…”

“…Density values determined in this work: +, T = 273.20 K; ○, T = 283.24 K; □, T = 293.27 K. Density values reported by other authors plotted for comparison. Ben Souissi et al: ◇, T = 273.15 K; ▽, T = 283.15 K; △, T = 293.15 K; Wegge: ―, T = 273.15 K; |, T = 283.15 K. Sarashina et al for (0.248 argon + 0.752 carbon dioxide) mixture: ×, T = 288.15 K. The uncertainty of the EOS-CG (zero line) in density is 1.0 % as reported in ref .…”

Speeds of Sound in n-Pentane at Temperatures from 233.50 to 473.15 K at Pressures up to 390 MPa

“…The speed of sound apparatus used at Ruhr University Bochum was based on the design of Meier and Kabelac, set up according to Gedanitz et al, and further improved by Wegge at al where the apparatus is also described in detail.…”

Thermodynamic Characterization of Gas Mixtures for Non-Thermal Plasma CO2 Conversion Applications with Soft-SAFT

“…Figure1. Isothermal density−pressure diagrams of CO 2 mixtures with (a) 50% Ar with experimental data (circles56 ), (b) 50% O 2 with experimental data (circles57 ), (c) 13.8% CO with experimental data (circles58 ), and (d) 28.895% N 2 with experimental data (squares59 and circles60 ). In all cases, soft-SAFT calculations are represented by full lines.T h i s c o n t e n t i s o n l y l i c e n s e d f o r c o n s u m p t i o n b y A u t h o r i z e d U s e r s a f f i l i a t e d w i t h s c i t e .…”