Key words: supercritical carbon dioxide, betulin, solubility, co-solvent, equation of state
The results of experimental investigation of betulin solubility in pure and modified supercritical carbon dioxide in the range of temperature (313.15 -333.15 K) and pressure (8.00-30.00 MPa) using the dynamic method are presented. It was found that in pure supercritical carbon dioxide betulin does not dissolve but only swells. The addition of 5 %
ethanol as a co-solvent increases the solubility. The pressures corresponding to the first
and second crossover points of - (7.7-8.3) MPa and -(27.1-27.6) MPa, respectively,
are established in this work. The results of the descri ption of the experimental data using
a model based on the Peng-Robinson equation of state are presented.
doi:10.34984/SCFTP.2023.19.2.001