The solubility of dibenzothiophene (DBT) in sub- and supercritical propane has been measured using a static view cell at pressures from (2.7 to 8.0) MPa and temperatures from (298 to 405) K. The values of the mole fraction of DBT varied from 1.3*10-3 to 4.8*10-2 over the experimental range studied. These values are 2 orders of magnitude higher than those reported in the literature for DBT in CO2 at similar values of reduced pressure and temperature, which is indicative of the excellent solvent properties of propane for the extraction of polyaromatic compounds, compared to CO2. On the other hand, when comparing the solubility of DBT in propane to that of other polyaromatic hydrocarbons (PAHs), it is found that DBT solubility (sulfur PAH) is at least 1 order of magnitude larger than that of anthracene, which in turn is 1 order of magnitude larger than that of carbazole (nitrogen PAH). These results can be mainly attributed to the effect of the vapor pressure of the solutes and, to a lesser extent, to their polarity. The experimental data have been correlated by the Peng-Robinson equation of state using two sets of mixing rules for the calculation of mixture parameters aM and bM, obtaining values of the average percentage deviation (APD) of 17 % and 18 %. Likewise, the empirical equation of Chrastil was used to model the experimental data, yielding a slightly higher APD (20 %).
Compounds
#
Formula
Name
1
C12H8S
dibenzothiophene
2
C3H8
propane
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.