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

Abstract

Solubilities of carbon dioxide in eicosane (C 20H 42), docosane (C 22H 46), tetracosane (C 24H 50), and octacosane (C 28H 58) 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 CO 2 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.