In this work, new solubility data of CO2 in aqueous piperazine (Pz) solutions were measured over a temperature range from T = (287.1 to 313.1) K and for amine concentrations from m = (0.10 to 2.00) mol*kg-1. The CO2 partial pressure was kept within PCO2 = (0.11 to 525.17) kPa using a vapor-liquid equilibrium (VLE) apparatus based on a static-synthetic method. These experimental data and those found in the literature for the ternary system Pz-CO2-H2O were correlated using a model combining the virial equation of state to calculate the fugacity coefficients with a modified Pitzer's thermodynamic model for the activity coefficients. With the new extended interaction parameters ssi,j0 and ssi,j1 that cover a wide range of temperature, CO2 partial pressure, and amine concentration, the model is able to correlate satisfactorily the available reliable experimental solubility data.
Compounds
#
Formula
Name
1
C4H10N2
piperazine
2
CO2
carbon dioxide
3
H2O
water
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.