Effect of cyclic and branched isomers on the VLE of CO2 + alkane mixtures

JUAN MANUEL MILANESIO; SERGIU SIMA; JULIA CRUZ-DOBLAS; MARTÍN CISMONDI; CATINCA SECUIANU

Eindhoven

Simposio; 27th European Symposium on Applied Thermodynamics (ESAT 2014); 2014

Eindhoven University of Technology, Delft University of Technology, Petroleum Institute, Abu Dhabi, UAE

Phase equilibrium data are essential in the chemical and biotechnology industry, and for the development and validation of thermodynamic models. It is especially important to understand the global phase behavior of systems within the range of working pressures and temperatures as some systems may display various multiphase equilibria. In a previous paper [1] the phase equilibria of carbon dioxide + n-alkanes series was studied using a predictive correlation based on a three-parameter cubic equation of state. Recently [2], a study on carbon dioxide + cycloalkanes binary systems was started. In this work we review and analyze an important amount of data available in the literature for CO2 + alkane mixtures, with special focus on comparing the behavior of the corresponding systems for normal, branched, and naphthenic or cyclic isomers, when possible. Some general trends were found and discussed. In addition, we present new high pressure measured data for the binary system CO2 + cyclopentane and CO2 + cyclohexane at different temperatures. These new data were successfully correlated with the RKPR EOS.