Isothermal VLE (PTxy) measurements and modeling of the high-pressure and high-temperature phase behavior of SC CO2 + aniline mixture using the PC-SAFT and PR equations of state

Abstract

This paper presents a new experimental VLE (PTxy) property data of aniline in the near and supercritical CO2 at four selected isotherms of (313.15, 333.15, 353.15, and 443.15) K over the pressure range from (0.8 to 32.4) MPa using a high-temperature and high-pressure (HTHP) optical cell. Samples were taken from both equilibrium phases and analyzed using gravimetric technique. The critical property data (PC−TC) have been estimated based on measured VLE data for SC CO2 +aniline mixture. The PC-SAFT and PR equations of state (EoS) were successfully applied to model the phase equilibrium (PTxy) behavior of CO2 +aniline mixture. The present experimental VLE data and the critical curves behavior predicted from both EoS indicates that the phase diagram of the CO2 +aniline mixture belongs to Type III according to classification Konynenburg and Scott.