Second and third virial coefficients of three binary mixtures containing xenon, at 273 K: Comparison between Xe + C_2H_6, Xe + C_2H_4 and Xe + CO_2

摘要

This paper presents volumetric data for the mixtures xenon-ethane, xenon-ethene and xenon-carbon dioxide, with xenon mole fractions covering the whole composition range, at 273.000 K and pressures up to 3.5 MPa, measured using a Burnet apparatus. Second and third virial coefficients were derived for each mixture from the experimental compressibility factors, Z.Data for the pure components are also determined for consistency purposes and for the calculation of the unlike-interaction vitrial coefficients, B_(12), C_(112) and C_(122). Corrections for the effects of adsorption, and the procedure for computation of the compressibility factors and virial coefficients are described. In order to accomplish a better understanding of the intermolecular forces present in real fluids, the cross virial coefficients, B_(12), of the studied systems were theoretically calculated using a two centre Lennard-Jones (L-J) model, and compared with experimental data. The importance of the third virial cross coefficients C_(112) and C_(122) is discussed.