Abstract
Phase equilibria and saturated density for ethylene + ethanol system at high pressures were measured at 283.65 K with a static circulation apparatus. The experimental apparatus equipped with three Anton Paar DMA 512S vibrating tube density meters was previously developed for measuring vapor-liquid-liquid equilibrium at high pressures. Coexisting phase composition and saturated density of each phase can be measured by means of the apparatus with a maximum temperature and pressure of 400 K and 20 MPa, respectively. The present experimental results include vapor-liquid equilibria (VLE), liquid-liquid equilibria (LLE), and vapor-liquid-liquid equilibria (VLLE). The reproducibility of VLLE was within 0.001 mole fraction at the same pressure. The uncertainties of the experimental equilibrium composition, density, temperature, and pressure are ±0.001 mole fraction, ±0.1 kg·m-3, ±0.1 K, and ±1 kPa, respectively. The equilibrium composition and saturated density of each phase were determined by using gas chromatograph and vibrating tube density meters, respectively. The experimental data were correlated with the conventional SRK equation of state and the pseudocubic equation of state. The pseudocubic equation of state gave better calculation results for saturated liquid density behaviors, comparing with the conventional SRK equation of state. For saturated vapor density behavior, the SRK equation of state however gave the better calculation results than the ones of the pseudocubic equation of state.
