A systematic study of the SO2 solubility of binary systems (SO2 + water + 1 electrolyte) and of the complex mixtures seawater and brine was performed. The experimental setup allowed a comprehensive description of the equilibrium state by a UV spectroscopic measurement of the partial pressure of SO2 in the gas phase and the concentration of sulphur compounds in the liquid phase. The influence of main ions present in the brine (e.g. Na+, Cl-, K+, Mg2+, Ca2+, HCO3 -) was studied at 298 and 323 K. The experiments revealed considerable deviations of already existing models from experimental data mainly at higher temperatures. A thermodynamic model based on caloric data and a Pitzer and a Sechenov approach for the calculation of activity coefficients was fitted to experimental data. This work demonstrates that fitting selected Pitzer parameters improves the model performance very much. The new model provides a reliable prediction of SO2 solubility over the entire investigated range of temperature and concentrations.
Compounds
#
Formula
Name
1
H2O
water
2
N2
nitrogen
3
O2S
sulfur dioxide
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.