Kinetics of carbonate based CO2 capture systems

Abstract

Abstract The Henry’s law constants for physical solubility of N2O were measured up to 80 ∘C for sodium and potassium carbonate solutions and the results were compared with the model of Weisenberger and Schumpe (1996). Overall gas phase mass transfer coefficients were measured with a string of discs apparatus for 5–30 wt-% sodium carbonate solution and for 5–50 wt-% potassium carbonate solution up to 70 ∘C. The Henry’s law constants measured in this study agree well with literature. The Henry’s law constants increase with temperature and carbonate concentration. The model of Weisenberger and Schumpe agrees well with measured data at 25 ∘C, but it underestimates the Henry’s law constant at higher temperatures. Overall mass transfer coefficients for potassium and sodium carbonate increase with temperature but decreases with concentration at high concentrations. Potassium carbonate solutions have higher overall mass transfer coefficients than sodium carbonate. Adding amines as promoter gives decade higher absorption rates compared to pure carbonate solutions.