Experimental vapor-liquid equilibria for the carbon dioxide + octane, and carbon dioxide + decane systems from 313 to 373 K

The study of systems containing carbon dioxide + hydrocarbon is important for the enhanced oil recovery, at the chemical, and petrochemical industries. We are focused on the application of supercritical carbon dioxide to extract sulfur compounds from fuels. In the development of an extraction process are involved multicomponent mixtures. For the modeling of these systems the interaction parameters are required for all the binary pairs presented. Unfortunately, the determination of these interaction parameters requires of high accurate experimental data over a wide range of temperatures. Binary systems involving carbon dioxide + sulfur compound, and carbon dioxide + sulfur compound + alkane have been already reported in the literature [1,2]. This work is focused in the study of the phase behavior of the carbon dioxide + alkane mixtures as complement of the previous papers [1,2]. Vapor-liquid equilibria for the carbon dioxide + octane, and carbon dioxide + decane systems were measured at temperatures from 313 to 373 K. The experimental data were obtained using an apparatus based on the static-analytic method [3]. Data from the literature [4,5] were compare with the results obtained in this work. Good agreement was found. Vapor-liquid equilibrium data were correlated with the Peng-Robinson equation of state. Partition coefficients were calculated from the equilibrium compositions.