Abstract
The phase equilibria in the binary systems CO2-C2H5OH, CO2-H2O and in the ternary system CO2-C2H5OH-H2O were measured at temperatures near the critical point of CO2. The Patel-Teja equation of state, which is known to describe well the saturated properties of pure components CO2, C2H5OH and H2O, was tried for the correlation of phase equilibria in these binary systems. However, good correlation was not obtained. The most probable reason for this is the assumption of random mixing of molecules in the equation. To take the local molecular concentration into account, Wilson''s model was applied to improve the mixing factor in the Patel-Teja equation. This has remarkably improved correlation for the phase equilibria of the binary systems. It has also been found that the phase behavior of the ternary system can approximately be predicted, but equilibrium concentration estimations are not yet satisfactory.
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