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 tempe ratures from 323.2 to 473.2 K and pressures up to 40 MPa. The solubili ty increased with pressure and decreased with temperature. At a temper ature of 323.2 K, bubble point pressures of carbon dioxide-eicosane an d -docosane systems showed a large enhancement around 0.78 CO2 mole fr action. At the higher temperatures, bubble point measurements were car ried 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 rul e proposed by Zhong and Masuoka [C. Zhong, H. Masuoka, J. Chem. Eng. J pn. 29 (1996) 315-322] provided prediction of the solubility with an a verage absolute deviation of 2.3% and can predict the solubility with satisfactory accuracy except near the mixture critical point. (C) 1998 Elsevier Science B.V. All rights reserved.