Abstract
Compositions and molar volumes of the three phases in liquid-liquid-gas equilibrium are reported for ternary mixtures of isopropanol, water and CO2 at elevated pressures and at temperatures of 50 and 60°C. Phase compositions and molar volumes were also obtained for three-phase, liquid-liquid-liquid equilibrium and four-phase, liquid-liquid-liquid-gas equilibrium at 40°C. Gas-liquid and liquid-liquid critical endpoints, which represent pressure bounds on the liquid-liquid-gas region at 60°C, were determined from observations of critical opalescence. The phase behavior exhibited by the isopropanol-water-CO2 system is quite complex, particularly at conditions near the critical point of CO2. These conditions are well within the range of operating conditions proposed for supercritical-fluid extraction of organic compounds from water using CO2. Therefore, the existence of multiple coexisting phases can be an important factor in designing and operating such extraction processes.
Original language | English (US) |
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Pages (from-to) | 261-271 |
Number of pages | 11 |
Journal | Fluid Phase Equilibria |
Volume | 32 |
Issue number | 3 |
DOIs | |
State | Published - 1987 |
Externally published | Yes |
ASJC Scopus subject areas
- Chemical Engineering(all)
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry