A semiempirical gas-liquid equilibrium model for CO2 inaqueous 3 mol/l AMP (2-amino-2-methyl-1-propanol), ispresented. It refers to high CO2 loadings (y>0.5) in thetemperature interval between 20 and 50 C, and is based onexperimental solubility and pH determinations. For a givenamine concentration it gives the equilibrium partial pressureof CO2 as a function of only two variables: the CO2 loadingand the temperature.The model correlates the expressions for the chemicalequilibria involved, as follows: PC02 = my 10X, where PC02 isthe equilibrium partial pressure, x = logK - pH, m is theamine molarity, y is the CO2 loading, and K is a parameterinvolving Henry's law constant, H, and the first dissociationconstant, K 1, of carbonic acid.pH is found to depend on both the temperature and the CO2loading and logK is found to depend only on the CO2 loading.Correlation's for pH and logK are presented. The model fitsown data as well as equilibrium data found in recentliterature for 3 mol/l AMP very well.
展开▼
