High-pressure phase equilibria for the carbon dioxide 2-pentanol and carbon dioxide water 2-pentanol systems

Abstract

High pressure vapor-liquid equilibria for the binary carbon dioxide-2-pentanol system are measured at 313.2 K. The phase equilibrium apparatus used in this work is of the circulation type in which the coexisting phases are recirculated, on-line sampled, and analyzed. The critical pressure and corresponding mole fraction of carbon dioxide at 313.2 K are found to be 8.67 MPa and 0.985, respectively, for this binary system. The phase equilibria for the ternary carbon dioxide-water-2-pentanol system are also measured at 313.2 K and at pressures of 2.0, 4.0, 6.0, 8.0, and 8.64 MPa. The ternary carbon dioxide-2-pentanol-water systems show three LLV phases over the range of pressure up to 8.64 MPa. The binary experimental equilibrium data are correlated with the Redlich-Kwong, Soave-Redlich-Kwong, Peng-Robinson, and Patel-Teja equations of state with two different mixing rules, the van der Waals and the Panagiotopoulos-Reid mixing rules. The binary experimental data are well correlated by using three equations of state and corresponding mixing rules. (C) 1998 Elsevier Science B.V. All rights reserved.