SCF-TP on-line  

2019, N2, pp. 40-66

T.R. Bilalov, F.M. Gumerov

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

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, LeeKesler, Riedel, FrostKolkuorfTodos and RiedelPlankMiller do not allow the experimental data to be described with acceptable (up to 1012 %) 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.

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


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