Measurement and Thermodynamic Modeling of the Solubility of CO2 in the Aqueous Mixtures 2-Amino-2-methyl-1-propanol (AMP) and 2-(2-aminoethylamine)ethanol (AEEA)

Document Type : Research Article


Department of Chemical Engineering, Tarbiat Modares University, Tehran, I.R. IRAN


Different techniques such as physical and chemical absorption are used for the removal of carbon dioxide. Alkanolamines are widely used as a chemical absorbent for acid gas purification. Among the alkanolamines, 2-(2-aminoethylamine)ethanol (AEEA) and 2-amino-2-methyl-1-propanol (AMP) have a high absorption capacity. In this work, the equilibrium solubility of CO2 in aqueous mixtures of AEEA and AMP is measured at different partial pressures (0.25 to 0.85)kPa and different temperatures (30 to 60) C. The measurements are shown that carbon dioxide loading is increased by rising the amount of AEEA/AMP mole ratio in the solution. Also, the solubility of CO2 is increased at higher partial pressures. The Extended UNIQUAC method is used to model the behavior of the mixture. In order to model the quaternary system (AMP–AEEA–CO2–Water), binary interaction parameters for ternary subsystems (AMP–CO2–Water) and (AEEA–CO2–Water) are optimized. By the Extended UNIQUAC model the CO2 partial pressures are obtained in the ternary subsystems (AMP–CO2–Water) and (AEEA–CO2–Water) with average absolute percent deviations (AAD%) equal to 19.23 and 12.9, respectively. Finally, binary interaction parameters for the quaternary system (AMP–AEEA–CO2–Water) are optimized and the CO2 partial pressures in an aqueous mixture of AEEA + AMP are obtained with AAD% = 17.54.


Main Subjects

[1] Kohl A., Nielsen R., Gas Purification, 5th Edition, Houston, (1997).
[2] Sartorl G., Savage D.W., Sterically Hindered Amines for CO2 Removal from Gases, Ind Eng Chem Fundam, 22: 239-249 (1983).
[3] Tong D.M.G., Trusler M., Fennell P., Solubility of carbon Dioxide In Aqueous Blends of 2-Amino-2-Methyl-1-Propanol and Piperazine, Chemical Engineering Science, 101: 851–864 (2013).
[5] Ahmad R.,  "Vapor Liquid Equilibrium (VLE) in H2O-Amine-CO2 System", Master's Thesis, Norwegian University of Science and Technology, Norway, (2012).
[6]  Ma’mun S., Jakobsen J.P., Svendsen H.F., Experimental and Modeling Study of the Solubility of Carbon Dioxide in Aqueous 30% Mass  2-((2-Aminoethyl)amino)ethanol Solution, Ind. Eng. Chem. Res, 45: 2505-2512 (2006).
[7] Bindwal A.B., Vaidya P.D., Kenig E.Y., Kinetics of Carbon Dioxide Removal by Aqueous Diamines, Chem. Eng. J., 169: 144-150 (2011).
[8] Shariff A.M., Murshid G., Lau K., Bustam M. A., Solubility of CO2 in Aqueous Solutions of 2-Amino-2-Methyl-1-Propanol at High Pressure, International Scholarly and Scientific Research & Innovation, 5: 825-828 (2011).
[10] Aroua M., Haji-Sulaiman M., Ramasam K., Modelling of Carbon Dioxide Absorption in Aqueous Solutions of AMP and MDEA and their Blends Using Aspen Plus, Separation and Purification Technology,  29: 153-162 (2002).
[11] Kundu M., Bandyopadhya S., Solubility of CO2 in Water +Diethanolamine+ 2-Amino-2-methyl-1-Propanol, J. Chem. Eng. Data, 51: 398–405, (2006).
[12] Dash S. K., Samanta A. N., Bandyopadhyay S. S., Solubility of Carbon Dioxide in Aqueous Solution of 2-Amino-2-Methyl-1-Propanol and Piperazine, Fluid Phase Equilibria, 307: 166–174 (2011).
[13] Choi W., Seo J., Jang S., Jung J., Joong Oh K., Removal Characteristics of CO2 Using Aqueous MEA/AMP Solutions in the Absorption and Regeneration Process, Journal of Environmental Sciences, 21: 907–913 (2009).
[18] Bajpai A., Mondal M.K., Equilibrium Solubility of CO2 in Aqueous Mixtures of DEA and AEEA, J. Chem. Eng. Data , 58: 1490-1495 (2013).
[20] Prausinitz J., Liehtenhaler R., Ageredo E., “Molecular Thermodynamics of Fluid Phase Equilibrium”, Prentice-Hall, Englewood Cliffs, Nj, (1999).
[21] Sadegh N., Stenby E.H., Thomsen K., Thermodynamic Modeling of CO2 Absorption in Aqueous N-Methyldiethanolamine Using Extended UNIQUAC Model, Fuel, 144: 295–306 (2015).
[22] Ermatchkov V., Kamps Á., Maurer G., Solubility of Carbon Dioxide in Aqueous Solutions of N-Methyldiethanolamine in the Low Gas Loading Region, Ind. Eng. Chem. Res, 45: 6081–6091 (2006).
[23] Rho S., Yoo K., Lee J., Nam S., Son J., Min B., Solubility of CO2 in Aqueous Methyldiethanolamine Solutions, J. Chem. Eng. Data, 42: 1161–1164 (1997).
[24] Aronu E., Gondal S., Hessen T., Haug-Warberg T., Hartono A.,  Solubility of CO2 in 15, 30, 45 and 60 mass% MEA from 40°C to 120°C and Model Representation Using the Extended UNIQUAC Framework, Chemical Engineering Science, 66: 6393–6406 (2011).
[25] Lindholdt A., "Thermodynamic Modeling of Hydrogen Sulfide Solubility in Weak Electrolyte Solutions,", Master Thesis, The Technical University of Denmark (2008).
[26] Mundhwa M., Henni A., Molar Excess Enthalpy for Various {alkanolamine (1) + water (2)} Systems at T = (298.15, 313.15, and 323.15)K, J. Chem. Thermodynamics, 39: 1439–1451 (2007).
[27] Mehdizadeh H., Gupta M., Kim I., Da Silva E.F., AMP–CO2–Water Thermodynamics;
A Combination of UNIQUAC Model Computational Chemistry and Experimental Data
, International Journal of Greenhouse Gas Control, 18: 173–182 (2013).
[30] Maham Y., Mather A., Hepler L., Excess Molar Enthalpies of (Water Monoalkanolamine) Mixtures at 298.15K and 308.15K, J. Chem. Eng. Data , 42: 993-995 (1997).