Experimental determination of carbamate formation and amine protonation constants in 3-amino-1-propanol-CO2-H2O system and their temperature dependency

The equilibrium constant for the formation of carbamate in 3-amino-1-propanol-CO2-H2O system was evaluated at different CO2 loadings, different temperature values, and different amine protonation constant. The studied temperature varied from 298 to 328 K in an increment of 10 K and ionic strengths up to 1.5 M. The variation of the thermodynamic equilibrium constant with temperature was modeled according to the relationship of log K1 = 1846.8/T − 4.4152, while temperature dependency of amine protonation constant was correlated by log K2 = 2786.5/T + 0.5253.