Solubility of CO₂ in Water + Diethanolamine + 2-Amino-2-methyl-1-propanol

Abstract

This work presents new experimental results for the CO 2 solubility in aqueous blends of diethanolamine (DEA) + 2-amino-2-methyl-1-propanol (AMP) in the temperature range of (303 to 323) K and CO 2 partial pressure of (1 to 100) kPa. The mass fractions of the aqueous amine blends were 1.5 % DEA + 28.5 % AMP, 3 % DEA + 27 % AMP, 4.5 % DEA + 25.5 % AMP, and 6 % DEA + 24 % AMP. A rigorous thermodynamic model is developed to correlate and predict the vapor-liquid equilibrium (VLE) of CO 2 in aqueous blends of DEA and AMP. The modified Clegg-Pitzer equations have been used to develop a model for the quaternary system (CO 2 + AMP + DEA + H 2 O) using the interaction parameters derived from the VLE data of the corresponding ternary systems (CO 2 + AMP + H 2 O) and (CO 2 + DEA + H 2 O). Simulated annealing has been used for parameter estimation and for the determination of equilibrium composition of various species present in the liquid phase. The model predictions are in good agreement with the experimental data of CO 2 solubility in DEA + AMP blends of this work as well as those reported in the literature.

Solubility of CO2 in water+diethanolamine+N-methyldiethanolamine

“…5, it is clear that above a certain CO 2 partial pressure, corresponding to a CO 2 loading of 0.5 mol of CO 2 /mol of amine, the CO 2 solubility in a 30 mass% aqueous MDEA is greater than that of DEA. As reported earlier by Li and Shen [24] for MEA + MDEA blend, Park et al [25] for MEA + AMP and DEA + AMP blends, Li and Chang [26] for MEA + AMP blend, Seo and Hong [27] and Kundu and Bandyopadhyay [23] for DEA + AMP blend, a similar crossover in the solubility curves occur in Figs. 4 and 5.…”

“…Various approaches have been proposed in order to overcome the multiple local minima, which were discussed by Zhu and Xu [21] and Zhu et al [22], on the application of SA in phase stability for liquid-liquid equilibrium before Kundu et al applied this technique for the prediction of VLE of CO 2 in aqueous AMP solution [8], in aqueous MDEA solution [16], and in aqueous blends of DEA + AMP [23]. SA has been used in this work for the estimation of liquid phase composition at equilibrium and the interaction parameters of the VLE model.…”

Pitzer and Pitzer–Simonson–Clegg modeling approaches: Ternary HCl+1-propanol+water electrolyte system

“…This might be due to the apparent complexity of the related relations, the number of involved ion-interaction parameters, and would explain why some authors have used simplified version of the PSC models [13][14][15][16][17][18][19]. We have therefore undertaken in our laboratory the investigation of the HCl electrolyte in several mixed alcohol + water solvent systems based on Pitzer, PSC and an extended PSC [10] ion-interaction approaches.…”

Pitzer and Pitzer–Simonson–Clegg modeling approaches: Ternary HCl+ethanol+water electrolyte system

“…For instance, Clegg et al [12] presented a simplified version of the PSC equations for application in aerosol chemistry. Li and Mather [13][14][15], and Kundu et al [16][17][18] used as well simplified version of the PSC model to correlate the solubility data of CO 2 and H 2 S in various aqueous solutions of organic compounds. A survey of literature shows that only a limited number of authors have used a complete form of the PSC equations.…”