Removal of CO2 and H2S using Aqueous Alkanolamine Solusions
This work presents a theoretical investigation of the
simultaneous absorption of CO2 and H2S into aqueous solutions of
MDEA and DEA. In this process the acid components react
with the basic alkanolamine solution via an exothermic,
reversible reaction in a gas/liquid absorber. The use of amine
solvents for gas sweetening has been investigated using
process simulation programs called HYSYS and ASPEN. We
use Electrolyte NRTL and Amine Package and Amines
(experimental) equation of state. The effects of temperature and
circulation rate and amine concentration and packed column and
murphree efficiency on the rate of absorption were studied.
When lean amine flow and concentration increase, CO2 and H2S
absorption increase too. With the improvement of inlet amine
temperature in absorber, CO2 and H2S penetrate to upper stages of
absorber and absorption of acid gases in absorber decreases. The CO2
concentration in the clean gas can be greatly influenced by the
packing height, whereas for the H2S concentration in the clean gas the
packing height plays a minor role. HYSYS software can not
estimate murphree efficiency correctly and it applies the same
contributions in all diagrams for HYSYS software. By
improvement in murphree efficiency, maximum temperature
of absorber decrease and the location of reaction transfer to the
stages of bottoms absorber and the absorption of acid gases
increase.
[1] H. Mackenzie Douglas, A. Daniels Christina, "Design & Operation of a
Selective Sweetening Plant Using MDEA", Bryan Research &
Engineering, Inc., 1987.
[2] P.J.G. Huttenhuis, N.J. Agrawal, J.A. Hogendoorn, and G.F. Versteeg,
"Gas solubility of H2S and CO2 in aqueous solutions of N-methyl
diethanol amine", Journal of Petroleum Science and Engineering, 2007,
55,122-134.
[3] 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 diethanol amine", Chemical Engineering Science, 2005,
60, 6438-6451.
[4] A.L. Kohl, F.C. Riesenfeld, Gas Purification. 4th ed., Gulf Publishing
Company, Houston, 1985.
[5] B.P. Mandal, A.K. Biswas, and S.S. Bandyopadhyay, "Selective
absorption of H2S from gas streams containing H2S and CO2 in
aqueous solutions of N-methyldiethanolamine and 2-amino-2-methyl-1-
propanol", Separation and Purification Technology 35,2004a, 191-202.
[6] C.Polasek John, A.Iglesias-Silva Gustavo, "Using Mixed Amine
Solutions for Gas Sweetening",Bryan Research & Engineering ,
Inc.,1992.
[7] R. Maddox, "Gas and Liquid Sweetening" , Second edition , Campbell,
1977.
[8] P. V. Danckwerts, "The Reaction of CO2 with Ethanolamines," Chem.
Eng. Sci., 1981, 34, 443, 1979.
[9] 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.
[10] C.C. Chen, H.I. Brit, J.F. Boston, and L.B. Evans, "A local composition
model for the excess Gibbs energy of aqueous electrolyte systems: part
I: single solvent, single completely dissociated electrolyte system",
AICHE J., 1982, 4, 588-596.
[11] 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.
[12] G. Vallee, P. Mougine, S. julian, and W. Furst, Representation of CO2
and H2S absorption by aqueous solutions of diethanolamine using an
electrolyte equation of state, Ind. Eng. Chem. Res.,1999, 38,3473-3480.
[1] H. Mackenzie Douglas, A. Daniels Christina, "Design & Operation of a
Selective Sweetening Plant Using MDEA", Bryan Research &
Engineering, Inc., 1987.
[2] P.J.G. Huttenhuis, N.J. Agrawal, J.A. Hogendoorn, and G.F. Versteeg,
"Gas solubility of H2S and CO2 in aqueous solutions of N-methyl
diethanol amine", Journal of Petroleum Science and Engineering, 2007,
55,122-134.
[3] 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 diethanol amine", Chemical Engineering Science, 2005,
60, 6438-6451.
[4] A.L. Kohl, F.C. Riesenfeld, Gas Purification. 4th ed., Gulf Publishing
Company, Houston, 1985.
[5] B.P. Mandal, A.K. Biswas, and S.S. Bandyopadhyay, "Selective
absorption of H2S from gas streams containing H2S and CO2 in
aqueous solutions of N-methyldiethanolamine and 2-amino-2-methyl-1-
propanol", Separation and Purification Technology 35,2004a, 191-202.
[6] C.Polasek John, A.Iglesias-Silva Gustavo, "Using Mixed Amine
Solutions for Gas Sweetening",Bryan Research & Engineering ,
Inc.,1992.
[7] R. Maddox, "Gas and Liquid Sweetening" , Second edition , Campbell,
1977.
[8] P. V. Danckwerts, "The Reaction of CO2 with Ethanolamines," Chem.
Eng. Sci., 1981, 34, 443, 1979.
[9] 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.
[10] C.C. Chen, H.I. Brit, J.F. Boston, and L.B. Evans, "A local composition
model for the excess Gibbs energy of aqueous electrolyte systems: part
I: single solvent, single completely dissociated electrolyte system",
AICHE J., 1982, 4, 588-596.
[11] 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.
[12] G. Vallee, P. Mougine, S. julian, and W. Furst, Representation of CO2
and H2S absorption by aqueous solutions of diethanolamine using an
electrolyte equation of state, Ind. Eng. Chem. Res.,1999, 38,3473-3480.
@article{"International Journal of Chemical, Materials and Biomolecular Sciences:64666", author = "Zare Aliabad and H. and Mirzaei and S.", title = "Removal of CO2 and H2S using Aqueous Alkanolamine Solusions", abstract = "This work presents a theoretical investigation of the
simultaneous absorption of CO2 and H2S into aqueous solutions of
MDEA and DEA. In this process the acid components react
with the basic alkanolamine solution via an exothermic,
reversible reaction in a gas/liquid absorber. The use of amine
solvents for gas sweetening has been investigated using
process simulation programs called HYSYS and ASPEN. We
use Electrolyte NRTL and Amine Package and Amines
(experimental) equation of state. The effects of temperature and
circulation rate and amine concentration and packed column and
murphree efficiency on the rate of absorption were studied.
When lean amine flow and concentration increase, CO2 and H2S
absorption increase too. With the improvement of inlet amine
temperature in absorber, CO2 and H2S penetrate to upper stages of
absorber and absorption of acid gases in absorber decreases. The CO2
concentration in the clean gas can be greatly influenced by the
packing height, whereas for the H2S concentration in the clean gas the
packing height plays a minor role. HYSYS software can not
estimate murphree efficiency correctly and it applies the same
contributions in all diagrams for HYSYS software. By
improvement in murphree efficiency, maximum temperature
of absorber decrease and the location of reaction transfer to the
stages of bottoms absorber and the absorption of acid gases
increase.", keywords = "Absorber, DEA, MDEA, Simulation.", volume = "3", number = "1", pages = "94-10", }