High-Pressure Phase Equilibrium for Ethane + 2-Propanol at 308.15 K and 313.15 K

Abstract

Phase equilibria and saturated densities were measured at 308.15 K and 313.15 K with a static-circulation apparatus for ethane + 2-propanol at high pressures. An experimental apparatus equipped with three Anton Paar DMA 512S vibrating tube density meters had been previously developed for measuring vapor−liquid−liquid phase separation properties at high pressures. Coexisting phase compositions and saturated densities of each phase could be measured with the apparatus with a maximum temperature and pressure of 400 K and 20 MPa, respectively. For the present system, Kuenen et al. (Philos. Mag. 1899, 48, 180−203) had previously reported only the upper critical end point and the approximate lower critical end point. In the present study, the vapor−liquid equilibrium composition and saturated density of each phase were determined by gas chromatography and density measurements, respectively. Vapor−liquid−liquid equilibria was not observed in the present experiments. The experimental data obtained were correlated with equations of state.