Phase behavior involving three and four fluid phases is predicted for ternary mixtures of isopropanol, water and CO2 at temperatures and pressures near the critical point of CO2. These predictions are based on the Peng-Robinson equation of state and selected experimental measurements of phase compositions for the L1L2G, L1L2L3 and L1L2L3G equilibria for the ternary mixture. The calculated results show that this equation of state can describe several unique features of the phase diagram. These features include tricritical points, secondary critical endpoints, and a four-phase L1L2L3G equilibrium. Although quantitative agreement with measured phase compositions was not obtained, the Peng-Robinson equation did predict all the regions of multiple equilibrium phases that were observed in the experiments including those regions not used to obtain the equation-of-state parameters.
ASJC Scopus subject areas
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering