2019, №2

сс. 40-66

Description of Solubility in Supercritical Carbon Dioxide as a Method to Determine Saturated Vapor Pressure of Desolved Substances

2019, №2

сс. 40-66

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T.R. Bilalov, F.M. Gumerov

Key words: supercritical carbon dioxide, solubility, Peng-Robinson equation, saturated vapor pressure

The influence of the method of determining the vapor pressure of various substances
on the accuracy of the descri ption of their solubilities in supercritical carbon dioxide
is studied. It is shown that in most cases the computational methods of Clapeyron,
Lee—Kesler, Riedel, Frost—Kolkuorf—Todos and Riedel—Plank—Miller do not allow
the experimental data to be described with acceptable (up to 10—12 %) accuracy. The
accuracy of the solubility descri ption is significantly increased by using the saturated
vapor pressure as the second fitting parameter in addition to the coefficient of binary
interaction. It is suggested to use the described approach to indirectly determine the
saturated vapor pressure of substances through the descri ption of their solubilities. It
is shown that the results obtained using this approach are much better consistent
with the experimental data than those obtained by the above mentioned calculation
methods.

doi:10.1134/S1990793119080025