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In this paper, we applied PC-SAFT and SAFT-HR equations of state so as to reproduce the solubility of carbon dioxide in aqueous diethanolamine solution. By using these equations, we have been able to model the solubility of carbon dioxide in aqueous amine solution in more than 350 experimental data points with wide range of amine molar concentration (0.01–0.12), temperature (300 K –478 K), carbon dioxide partial pressure (0.0001 KPa –5473 KPa), and carbon dioxide loading (0.04 –1.1). Ternary systems including water, carbon dioxide and diethanolamine have also been modeled by PC-SAFT and SAFT-HR equations of state based on bubble pressure algorithm. Binary interaction parameters are set to zero to show the genuine capability of equations of state in reproducing such experimental data. Provided modeling results have been obtained from MATLAB R2019b software for PC-SAFT equation of state are less deviated with experimental data. Overall average relative deviation of SAFT-HR and PC-SAFT are 45.452% and 4.374% respectively which show that PC-SAFT is a robust equation of state in predicting the solubility data of carbon dioxide in aqueous alkanolamine solutions. [ABSTRACT FROM AUTHOR]

A rigorous thermodynamics model of CO 2 absorption by monoethanolamine (MEA) is essential to model treatment of acid gases by aqueous MEA. In this study, the statistical associating fluid theory (SAFT) is applied for modeling the CO 2 absorption by MEA. The pure component properties of MEA, vapor-liquid equilibrium properties of binary MEA-H 2 O and ternary MEA-CO 2 -H 2 O are evaluated by considering the SAFT expression of Huang and Radosz (SAFT-HR). Consequently, pure component and binary interaction parameters of the SAFT-HR equation of state (EOS) for MEA are calculated utilizing the experimental data. The association scheme 2B is chosen with examining different association schemes 2B, 3B and 4C, and considering the capability of the model in prediction of pure component properties. It is also assumed that activities of species in chemical equilibrium equal to their mole fractions. The model predictions show a good agreement with the experimental data. Meanwhile, absolute average deviation percentage of ternary MEA-CO 2 -H 2 O system by the SAFT-HR EOS is 34.71% which it is less than 36.42% and 42.29% for the PC-SAFT EOS and e-NRTL model, respectively. [ABSTRACT FROM AUTHOR]