Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 31097
Using Mixed Amine Solution for Gas Sweetening

Authors: Zare Aliabadi, Hassan, Mirzaei, Somaye


The use of amine mixtures employing methyldiethanolamine (MDEA), monoethanolamine (MEA), and diethanolamine (DEA) have been investigated for a variety of cases using a process simulation program called HYSYS. The results show that, at high pressures, amine mixtures have little or no advantage in the cases studied. As the pressure is lowered, it becomes more difficult for MDEA to meet residual gas requirements and mixtures can usually improve plant performance. Since the CO2 reaction rate with the primary and secondary amines is much faster than with MDEA, the addition of small amounts of primary or secondary amines to an MDEA based solution should greatly improve the overall reaction rate of CO2 with the amine solution. The addition of MEA caused the CO2 to be absorbed more strongly in the upper portion of the column than for MDEA along. On the other hand, raising the concentration for MEA to 11%wt, CO2 is almost completely absorbed in the lower portion of the column. The addition of MEA would be most advantageous. Thus, in areas where MDEA cannot meet the residual gas requirements, the use of amine mixtures can usually improve the plant performance.

Keywords: CO2, H2S, monoethanolamine, Methyldiethanolamine

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 3342


[1] C.Polasek John, A.Iglesias-Silva Gustavo, "Using Mixed Amine Solutions for Gas Sweetening",Bryan Research & Engineering , Inc.,1992.
[2] D. Barth, C. Tondre, G. Lappai, and J.J. Delpecch, "kinetic Study of Carbon Dioxide Reaction and Tertiary Amines in Aqueous Solutions", J. Phys, Chem,1981, 85,3660.
[3] J.A. Bullin, J.C. Polasek, S. T. Donnelly,"The Use of MDEA and Mixtures of Amines for Amines for Bulk CO2 Removal," Proc.of 69th Gas Processors Association Convention, New Orleans, Louisiana, 1984.
[4] R. Maddox,"Gas and Liquid Sweetening", Second edition, Campbell, 1977.
[5] B.P Mandal, S.S Bandyopadhyay, "Simultaneous absorption of carbon dioxide and hydrogen sulfide into aqueous blends of 2-amino-2-methyl- 1-propanol and diethanolamine", Chemical Engineering Science, 2005, 60, 6438-6451.
[6] H. Mackenzie Douglas, A. Daniels Christina, "Design & Operation of a Selective Sweetening Plant Using MDEA", Bryan Research & Engineering , Inc.,1987.
[7] P. V. Danckwerts, "The Reaction of CO2 with Ethanolamines," Chem. Eng. Sci., 1981, 34,443,197
[8] D. W. Savage, E.W. Funk, "Selective Absorption of H2S and CO2 into Aqueous Solutions of Methyldiethanolam
[8] D. W. Savage, E.W. Funk, "Selective Absorption of H2S and CO2 into Aqueous Solutions of Methyldiethanolamine," AIChE meeting, Houston, Texas, April 5-9,1981.
[9] P.J.G. Huttenhuis, N.J. Agrawal, J.A. Hogendoorn, and G.F. Versteeg, "Gas solubility of H2S and CO2 in aqueous solutions of Nmethyldiethanolamine", Journal of Petroleum Science and Engineering,2007, 55,122-134.
[10] Markus Bolhar-Nordenkampf, Anton Friedl, Ulrich Koss, and Thomas Tork, "Modelling selective H2S absorption and desorption in an aqueous MDEA-solution using a rate-based non-equilibrium approach", Chemical Engineering and processing, 2004, 43,701-715.