Experimental determination and modelling of high-pressure phase behavior for the binary system CO2 + cyclooctane

Abstract

Experimental determination and modelling of high-pressure phase behavior for the binary system CO 2 + cyclooctane 2 Highlights  High-pressure phase equilibria were measured for the system CO 2 + cyclooctane  80 bubble points and 16 dew points were acquired  The experimental data were obtained using a variable volume high-pressure cell  The studied binary system probably exhibits a type V phase behavior  Data were correlated with the Peng-Robinson equation and advanced mixing rules

High-Pressure Phase Equilibria Measurements of the Carbon Dioxide + Cycloheptane Binary System

“…10,11 From the results reported in this paper, it can be concluded that the binary system CO2 + cycloheptane also belongs to type I or II since the vapor-liquid critical curve is, highly likely, continuous. Finally, the binary mixture CO2 + cyclooctane probably exhibits type V phase behavior 3 but more experiments are necessary to validate this assumption.…”

“…1,2 Even in the oil and gas sector, high-pressure phase equilibrium data as well as thermodynamic data regarding to uncommon molecules (such as naphthenic components with more than six carbon atoms in ring or with multiple aromatic ring) are welcomed. 1,3 Due to the important role of carbon dioxide in the chemical, pharmaceutical and petrochemical industries, phase equilibrium data of mixtures containing CO2 remain crucial. [4][5][6][7][8] In our previous works 3,9 , a lack of data for two kinds of binary systems containing carbon dioxide + a naphthenic compound was noticed; they are CO2 + branched naphthenes and CO2 + naphthenes that contains more than 6 carbon atoms in ring (cycloheptane, cyclooctane, etc.).…”

“…1,3 Due to the important role of carbon dioxide in the chemical, pharmaceutical and petrochemical industries, phase equilibrium data of mixtures containing CO2 remain crucial. [4][5][6][7][8] In our previous works 3,9 , a lack of data for two kinds of binary systems containing carbon dioxide + a naphthenic compound was noticed; they are CO2 + branched naphthenes and CO2 + naphthenes that contains more than 6 carbon atoms in ring (cycloheptane, cyclooctane, etc.). Indeed, the binary systems CO2 + cyclopentane and CO2 + cyclohexane were widely investigated in the past and more details about the different studies related to these two systems can be found elsewhere.…”

“…However, experimental data are still needed for many application areas. , Even in the oil and gas sector, high-pressure phase equilibrium data as well as thermodynamic data regarding uncommon molecules (such as naphthenic components with more than six carbon atoms in the ring or with multiple aromatic rings) are welcomed. , Due to the important role of carbon dioxide in the chemical, pharmaceutical, and petrochemical industries, phase equilibrium data of mixtures containing CO 2 remain crucial. − …”

“…No literature data were available for the binary mixture CO 2 + cyclooctane under pressure, and we thus recently published bubble and dew points for this system. The situation is almost similar for the binary system CO 2 + cycloheptane.…”