Solubility of carbon dioxide in eicosane, docosane, tetracosane, and octacosane at temperatures from 323 to 473 K and pressures up to 40 MPa

Solubilities of carbon dioxide in eicosane (C20H42), docosane (C22H46), tetracosane (C24H50), and octacosane (C28H58) were measured at temperatures from 323.2 to 473.2 K and pressures up to 40 MPa. The solubility increased with pressure and decreased with temperature. At a temperature of 323.2 K, bubble point pressures of carbon dioxide–eicosane and –docosane systems showed a large enhancement around 0.78 CO2 mole fraction. At the higher temperatures, bubble point measurements were carried out up to the vicinity of the mixture critical points. Prediction of the solubility using the PSRK and the SRK equations of state with two excess Gibbs free energy mixing rules was examined. The mixing rule proposed by Zhong and Masuoka [C. Zhong, H. Masuoka, J. Chem. Eng. Jpn. 29 (1996) 315–322] provided prediction of the solubility with an average absolute deviation of 2.3% and can predict the solubility with satisfactory accuracy except near the mixture critical point.