Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

Experimental measurements of the phase equilibria of (CO2 + butylbenzene) and (CO2 + butylcyclohexane) have been made with an analytical apparatus at temperatures of (323.15, 373.15 and 423.15)K at pressures from 2MPa to the mixture critical pressure. These are the first results to be published for (CO2 + butylcyclohexane),while for (CO2 + butylbenzene) they are the first at pressures above 6MPa. Tomodel the data,we use the Peng Robinson equation of state withWong Sandler mixing rules incorporating theNRTL equation. Themodel describes themeasured bubble point curves verywell at all temperatures, except close to the mixture critical points at high pressures. The dew point curves are described well only at the lowest temperature; otherwise, deviations increase in the approach to the mixture critical point.