https://doi.org/10.1016/j.egypro.2017.03.1298
“Primary and secondary amines form carbamates from their reaction with carbon dioxide. Fig . 9 shows
equilibrium constant values for monoethanolamine and diethanolamine. Literature data [23–30] for each solvent
were regressed into the form of Equation 16. The regressed coefficients are shown in Table 4. Literature data for
five other solvents are shown in Fig. 10. The coefficients for the models of these solvents are also shown in Table 4.
”
“We investigated several relationships between the coefficients given in Table 4 and pKa. Because there are very
few data points, all of these derived relationships are highly uncertain. We thus decided to develop a single, simple,
general model equation averaged from the models of each solvent. Table 1 shows the general model’s coefficients.
The Ai and Di coefficients shown in Table 1 were obtained by averaging the Ai and Di coefficients for each of the
solvent shown in Table 4. Fig. 11 shows the data for all solvents and the regressed model.
Kim et al. [31] derived the enthalpy of reaction from several equilibrium models for monoethanolamine. Fig. 12
compares our new model to those models.”