Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

Vapor-liquid equilibria in binary carbon dioxide-ethanol systems and ternary carbon dioxide-ethanol-water systems were studied at temperatures ranging from 333 to 373 K and pressures up to 12 MPawith arbitrary feed compositions to the ternary systems. In experimental, a system coupled with twoback-pressure regulators was newly adopted, which gave flow rate of each gaseous and liquid phase tobe alternately regulated by temporal difference and thus also gave a continuous flow rate in each phaseat equlilbirum conditions. The results showed that the equilibrium data obtained in the both systemsgiven by the constructed new apparatus agreed well with literature data supported by the conventionalanalytical methods. Among the conventionally-proposed equation of states (EOS) adopted to the obtaineddata, the Peng-Robinson EOS coupled with modified Huron-Vidal second mixing rule was found to befeasible for predicting the equilibrium data in the both systems.