Vapor-liquid equilibrium data for the carbon dioxide and carbon monoxide (CO2 + CO) system at the temperatures 253, 273, 283 and 298 K and pressures up to 13 MPa

Experimental density and an improved Helmholtz-energy-explicit mixture model for (CO2 + CO)

“…Fig. 5 presents comparisons between the available VLE data in the literature [26][27][28][42][43][44] and the new mixture model. The available data cover almost the full temperature range possible from just above the triple-point temperature of CO2 to just below the critical temperature of CO2.…”

“…However, two major deficiencies were identified: first, some binary systems present large regions without data; second, there are significant discrepancies between different data sources. Despite some recent improvements in the data situation, including Tsankova et al [21,22] and Løvseth et al [23] on (CO2 + Ar), Petropoulo et al [24] on (CO2 + CH4), and Tsankova et al [25], Westman et al [26] and Souza et al [27] on (CO2 + CO), these deficiencies remain.…”

Need and Measurements of Accurate Thermodynamic Data for CCS

“…Four isotherms have recently been measured of the CO2-CO-system [13]. At 25 °C, only a single experimental point was identified prior to our work.…”

“…2, where our new data and the previous literature data point are plotted together with model prediction of the simple cubic model of Soave, Redlich and Kwong (SRK) [15] as well as the recent Helmholtz reference model for CO2-rich mixture EOS-CG from Ruhr-Universität Bochum [16]. In our work [13], the parameters of the Peng-Robinson (PR) cubic EOS [17] with the alpha correction by Mathias and Copeman [18] (MC), the mixing rules by Wong and Sandler [19] (WS), and the NRTL [20] excess Gibbs energy model were fitted to the new data. In addition, a scaling law was fitted and applied to predict the critical point of each isotherm to great accuracy.…”

“…Highly accurate phase equilibrium measurements of the binary mixtures CO2 + N2 [9], CO2 + O2 [10], CO2 + CH4 [11], CO2 + Ar [12], and CO2 + CO [13] have been important results of this work so far., using a facility specifically designed for accurate phase equilibrium measurements for CCS called CO2Mix [14]. In total, more than 23 isotherms have been measured with this setup, ranging in temperature from -60 to 30 °C and up to 182 bar in pressure, mostly in areas without data or with data in need of verification.…”