Key words: water, supercritical propane/butane mixture, phase equilibrium, solubility, thermodynamic model, Peng—Robinson equation of state
The results of an experimental study of the phase equilibrium of the «water—propane/butane»
system carried out in the temperature range of 403—443 K and the pressure range
of 5.28—20.66 MPa using a high-pressure optical cell are presented. The V type of phase
behavior is established. The solubility of water in a supercritical propane-butane mixture
under the above mentioned thermodynamic conditions is estimated based on the
characteristics of the steam branch of the phase equilibrium of the «water—propane/butane»
system and described using the Peng—Robinson equation of state in combination
with the Mukhopadhyay and Rao mixing rule was made.