LAUSR

Abstract In this work, density, vapor-liquid equilibrium and speed of sound measurements of the mixtures [CO 2  + 4.72 mol% SO 2  + 1.85 mol% CH 4 ] and [CO 2  + 0.09 mol% SO 2  + 1.54 mol% CH 4 ] were performed over the temperature range 263–373 K and at pressures of up to 30 MPa for density and up to 190 MPa for speed of sound. For the speed of sound measurements, the mixtures were doped with ≅ 0.8 mol% CH 3 OH. We compared our results to the values calculated using an extended version of the equation of state for combustion gases (EOS-CG) that includes binary models for the CO 2  + SO 2 and CO 2  + CH 4 subsystems, and a perturbed-chain statistical associating fluid theory (PC-SAFT) equation of state, validating both equations in this way. From our experimental results, we evaluated the impact of the simultaneous presence of SO 2 and CH 4 as impurities in anthropogenic CO 2 on selected parameters for carbon capture and storage technology. With the understanding that chemical effects have not been considered, we concluded that the presence of 4.72 mol% SO 2 compensates for the negative effect of 1.85 mol% CH 4 on most of the studied parameters, resulting in a favorable fluid for carbon, capture and storage, contrary to the mixture with 0.09 mol% SO 2 and 1.54 mol% CH 4 .