Yu Zhihui

Equilibrium Solubility Modeling of CO 2 in Na 2 Cr 2 O 7 Solutions

The solubility of CO2 in aqueous Na2Cr2O7 solutions of different concentrations (0, 0.361, 0.650, and 0.901 mol.kg(-1)) was measured in a stirred vapor-liquid high-pressure equilibrium cell using the static method at temperatures and pressures in the ranges of 313.2 to 333.2 K and 0.1 to 1.9 MPa, respectively. The results indicated that the phenomenon of CO2 dissolved in aqueous Na2Cr2O7 could be interpreted according to a salting-out effect. Furthermore, our solubility data for CO2 in aqueous Na2Cr2O7 was in agreement with Henrys law, and the Henry constant appeared to be a function of temperature, pressure, and the concentration of Na2Cr2O2. Two thermodynamic models were applied to correlate the experimental data, including the modified Setschenow and Peng-Robinson-Pitzer equations, and the averaged relative deviations were found to be 4.24% and 3.32%, respectively.

Equilibrium Solubility Modeling of CO2 in Na2Cr2O7 Solutions

The solubility of CO2 in aqueous Na2Cr2O7 solutions of different concentrations (0, 0.361, 0.650, and 0.901 mol.kg(-1)) was measured in a stirred vapor-liquid high-pressure equilibrium cell using the static method at temperatures and pressures in the ranges of 313.2 to 333.2 K and 0.1 to 1.9 MPa, respectively. The results indicated that the phenomenon of CO2 dissolved in aqueous Na2Cr2O7 could be interpreted according to a salting-out effect. Furthermore, our solubility data for CO2 in aqueous Na2Cr2O7 was in agreement with Henrys law, and the Henry constant appeared to be a function of temperature, pressure, and the concentration of Na2Cr2O2. Two thermodynamic models were applied to correlate the experimental data, including the modified Setschenow and Peng-Robinson-Pitzer equations, and the averaged relative deviations were found to be 4.24% and 3.32%, respectively.