ZHANG Jian-Shu, Zhang- Rong, Bi-Ji-Cheng. CO2 mineralization fundamental researchII.The thermodynamic equilibrium of carbonation in ternary amine[J]. Journal of Fuel Chemistry and Technology, 2011, 39(11): 871-875.
Citation:
ZHANG Jian-Shu, Zhang- Rong, Bi-Ji-Cheng. CO2 mineralization fundamental research II.The thermodynamic equilibrium of carbonation in ternary amine[J]. Journal of Fuel Chemistry and Technology, 2011, 39(11): 871-875.
ZHANG Jian-Shu, Zhang- Rong, Bi-Ji-Cheng. CO2 mineralization fundamental researchII.The thermodynamic equilibrium of carbonation in ternary amine[J]. Journal of Fuel Chemistry and Technology, 2011, 39(11): 871-875.
Citation:
ZHANG Jian-Shu, Zhang- Rong, Bi-Ji-Cheng. CO2 mineralization fundamental research II.The thermodynamic equilibrium of carbonation in ternary amine[J]. Journal of Fuel Chemistry and Technology, 2011, 39(11): 871-875.
The reaction of CaCl2 solution with CO2 in ternary amine was studied. In this multiphase reaction, calcium carbonate yield and amine extraction efficiency increased with the increase of CO2 pressure and CaCl2 concentration. The equilibrium of the reaction was analyzed by thermodynamics model coupled with Pitzer electrolytic solution model and a modified Henry’s law CO2 solubility model. The distribution of hydrochloric acid in aqueous and amine is restricted by extraction equilibrium. The concentration of H+ could affect the dissociation of carbonic acid, which determines calcium carbonate precipitation/dissolution equilibrium. The activity coefficients of HCO3- and CO32- decreased with the increase of CaCl2 concentration at constant CO2 pressure condition, and influenced the equilibrium. The calcium carbonate yield and amine extraction efficiency were close to the calculated equilibrium values, and the reaction is controlled by chemical equilibrium.