Abstract: High-pressure phase behavior of supercritical (SC) CO2+ethanol system was investigated at
333.2 K, 348.2 K, 353.2 K, 368.2 K, 413.2 K and 453.2 K and pressure from 2.0 MPa to 14.3
MPa. The measurement was carried out in a cylindrical autoclave with a moveable piston and
a window for adjustment and observation of phase equilibria at given T and p. The samples
were taken from two coexisting phases and were analyzed to obtain their compositions. It is
shown that the solubility of SC CO2 in ethanol increases drastically with pressures at the
given temperature, but the content of ethanol in CO2-rich phase increase faintly.

Key words: supercritical CO2, ethanol, phase equilibrium, high pressure

摘要： High-pressure phase behavior of supercritical (SC) CO2+ethanol system was investigated at
333.2 K, 348.2 K, 353.2 K, 368.2 K, 413.2 K and 453.2 K and pressure from 2.0 MPa to 14.3
MPa. The measurement was carried out in a cylindrical autoclave with a moveable piston and
a window for adjustment and observation of phase equilibria at given T and p. The samples
were taken from two coexisting phases and were analyzed to obtain their compositions. It is
shown that the solubility of SC CO2 in ethanol increases drastically with pressures at the
given temperature, but the content of ethanol in CO2-rich phase increase faintly.

关键词: supercritical CO2;ethanol;phase equilibrium;high pressure