Absorption of acid gases (CO2, H2S) from natural gas using a ternary blend of N-methyldiethanolamine (MDEA), 2-amino-2-methyl-1-propanol (AMP), and Sulfolane
ABID Salam Farooqi, RAIHAN Mahirah Binti Ramli, SERENE Sow Mun Lock, AHMAD Salam Farooqi, SYED Muhammad Wajahat, SIDRA Anis Farooqidownload PDF
Abstract. Natural gas (NG) must be treated to remove sulphur compounds and acid gases i.e., carbon dioxide (CO2) and hydrogen sulfide (H2S) to ensure that it complies with requirements for sale and transportation. More than 95% of the NG processing plants are operated through the acid gas removal unit (AGRU) using aqueous amine solvent in removing sour gas components from the hydrocarbon gas due to the availability of amine solvent at a low cost. However, the main limitation of this process is the high operating cost of providing sufficient thermal energy at the reboiler for solvent regeneration. Meanwhile, the reboiler duty requirement generally increases with the requirement of CO2 removal efficiency as higher energy consumption is required to strip off a more significant amount of CO2 from the rich solvent. This current study addresses the absorption performance of acid gases using ternary hybrid solvents of MDEA, AMP, and Sulfolane. A study on the effects of solubility on H2S and CO2 absorption was performed at varying pressure (1000-6000 kPa) and temperatures (25°C-50°C) using Aspen HYSYS®V12.1. The results revealed that the concentration of CO2 and H2S in sweet gas increased with the decrease in pressure, while increasing temperature increased the concentration of H2S and CO2 in sweet gas. The future study will look at the reboiler duty required for solvent regeneration using this ternary blend of MDEA, AMP, and Sulfolane.
Absorption, Simulation, Aspen HYSYS, Amines
Published online 5/20/2023, 8 pages
Copyright © 2023 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: ABID Salam Farooqi, RAIHAN Mahirah Binti Ramli, SERENE Sow Mun Lock, AHMAD Salam Farooqi, SYED Muhammad Wajahat, SIDRA Anis Farooqi, Absorption of acid gases (CO2, H2S) from natural gas using a ternary blend of N-methyldiethanolamine (MDEA), 2-amino-2-methyl-1-propanol (AMP), and Sulfolane, Materials Research Proceedings, Vol. 29, pp 9-16, 2023
The article was published as article 2 of the book Sustainable Processes and Clean Energy Transition
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 “Global Energy Review: CO2 Emissions in 2021 – Analysis – IEA.” https://www.iea.org/reports/global-energy-review-co2-emissions-in-2021-2.
 B. Obama, “The irreversible momentum of clean energy: Private-sector efforts help drive decoupling of emissions and economic growth,” Science (80-. )., vol. 355, no. 6321, pp. 126-129, Jan. 2017, https://doi.org/10.1126/science.aam6284
 A. S. Farooqi et al., “A comprehensive review on improving the production of rich-hydrogen via combined steam and CO2 reforming of methane over Ni-based catalysts,” Int. J. Hydrogen Energy, vol. 46, no. 60, pp. 31024-31040, Sep. 2021, https://doi.org/10.1016/j.ijhydene.2021.01.049
 A. S. Farooqi, R. M. Ramli, S. S. M. Lock, N. Hussein, M. Z. Shahid, and A. S. Farooqi, “Simulation of Natural Gas Treatment for Acid Gas Removal Using the Ternary Blend of MDEA, AEEA, and NMP,” Sustain. 2022, Vol. 14, Page 10815, vol. 14, no. 17, p. 10815, Aug. 2022, https://doi.org/10.3390/su141710815
 L. S. Tan, K. K. Lau, M. A. Bustam, and A. M. Shariff, “Removal of high concentration CO2 from natural gas at elevated pressure via absorption process in packed column,” J. Nat. Gas Chem., vol. 21, no. 1, pp. 7-10, Jan. 2012, https://doi.org/10.1016/S1003-9953(11)60325-3
 M. Torabi Angaji, H. Ghanbarabadi, and F. Karimi Zad Gohari, “Optimizations of Sulfolane concentration in propose Sulfinol-M solvent instead of MDEA solvent in the refineries of Sarakhs,” J. Nat. Gas Sci. Eng., vol. 15, pp. 22-26, Nov. 2013, https://doi.org/10.1016/j.jngse.2013.08.003
 N. Dave, T. Do, G. Puxty, R. Rowland, P. H. M. Feron, and M. I. Attalla, “CO2 capture by aqueous amines and aqueous ammonia-A Comparison,” Energy Procedia, vol. 1, no. 1, pp. 949-954, Feb. 2009, https://doi.org/10.1016/j.egypro.2009.01.126
 A. T. Zoghi, F. Feyzi, and S. Zarrinpashneh, “Experimental investigation on the effect of addition of amine activators to aqueous solutions of N-methyldiethanolamine on the rate of carbon dioxide absorption,” Int. J. Greenh. Gas Control, vol. 7, pp. 12-19, Mar. 2012, https://doi.org/10.1016/j.ijggc.2011.12.001
 N. M. A. Al-Lagtah, S. Al-Habsi, and S. A. Onaizi, “Optimization and performance improvement of Lekhwair natural gas sweetening plant using Aspen HYSYS,” J. Nat. Gas Sci. Eng., vol. 26, pp. 367-381, Sep. 2015, https://doi.org/10.1016/j.jngse.2015.06.030
 M. I. Stewart, Gas Sweetening. 2014. https://doi.org/10.1016/B978-0-12-382207-9.00009-3
 A. S. Farooqi, R. M. Ramli, S. S. M. Lock, N. Hussein, A. S. Farooqi, and S. M. Wajahat, “Simulation of acid gas removal unit using DIPA+TEA amine solvent,” IOP Conf. Ser. Mater. Sci. Eng., vol. 1257, no. 1, p. 012033, Oct. 2022, https://doi.org/10.1088/1757-899X/1257/1/012033
 T. Nejat, A. Movasati, D. A. Wood, and H. Ghanbarabadi, “Simulated exergy and energy performance comparison of physical-chemical and chemical solvents in a sour gas treatment plant,” Chem. Eng. Res. Des., vol. 133, pp. 40-54, May 2018, https://doi.org/10.1016/j.cherd.2018.02.040
 H. Ghanbarabadi and B. Khoshandam, “Simulation and comparison of Sulfinol solvent performance with Amine solvents in removing sulfur compounds and acid gases from natural sour gas,” J. Nat. Gas Sci. Eng., vol. 22, pp. 415-420, Jan. 2015, https://doi.org/10.1016/j.jngse.2014.12.024
 N. K. Sarker, “Theoretical effect of concentration, circulation rate, stages, pressure and temperature of single amine and amine mixture solvents on gas sweetening performance,” Egypt. J. Pet., vol. 25, no. 3, pp. 343-354, Sep. 2016, https://doi.org/10.1016/j.ejpe.2015.08.004
 V. Abkhiz and I. Heydari, “Comparison of amine solutions performance for gas sweetening,” Asia-Pacific J. Chem. Eng., vol. 9, no. 5, pp. 656-662, Sep. 2014, https://doi.org/10.1002/apj.1795
 S. Mitra, “A Technical Report on Gas Sweetening by Amines,” Sr. Process Eng. Petrofac Eng., no. June, pp. 1-58, 2015.
 P. M. M. Blauwhoff, G. F. Versteeg, and W. P. M. Van Swaaij, “A study on the reaction between CO2 and alkanolamines in aqueous solutions,” Chem. Eng. Sci., vol. 38, no. 9, pp. 1411-1429, 1983, https://doi.org/10.1016/0009-2509(83)80077-3
 U. Zahid, F. N. Al Rowaili, M. K. Ayodeji, and U. Ahmed, “Simulation and parametric analysis of CO2 capture from natural gas using diglycolamine,” Int. J. Greenh. Gas Control, vol. 57, pp. 42-51, Feb. 2017, https://doi.org/10.1016/j.ijggc.2016.12.016