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Simulation of Natural Gas Treatment for Acid Gas Removal Using the Ternary Blend of MDEA, AEEA, and NMP

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  • Abid Salam Farooqi

    (Department of Chemical Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Malaysia
    Centre of Innovative Nanostructures & Nanodevices, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Malaysia)

  • Raihan Mahirah Ramli

    (Department of Chemical Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Malaysia
    Centre of Innovative Nanostructures & Nanodevices, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Malaysia)

  • Serene Sow Mun Lock

    (Department of Chemical Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Malaysia
    CO 2 Research Center (CO2RES), Universiti Teknologi PETRONAS, Seri Iskandar 32610, Malaysia)

  • Noorhidayah Hussein

    (Group Technical Solutions, Project Delivery and Technology, Tower 3, PETRONAS Twin Towers, KLCC, Kuala Lumpur 50088, Malaysia)

  • Muhammad Zubair Shahid

    (Department of Chemical Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Malaysia)

  • Ahmad Salam Farooqi

    (Department of Chemical Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Malaysia)

Abstract

Natural gas (NG) requires treatment to eliminate sulphur compounds and acid gases, including carbon dioxide (CO 2 ) and hydrogen sulphide (H 2 S), to ensure that it meets the sale and transportation specifications. Depending on the region the gas is obtained from, the concentrations of acid gases could reach up to 90%. Different technologies are available to capture CO 2 and H 2 S from NG and absorb them with chemical or physical solvents; occasionally, a mixture of physical and chemical solvents is employed to achieve the desired results. Nonetheless, chemical absorption is the most reliable and utilised technology worldwide. Unfortunately, the high energy demand for solvent regeneration in stripping columns presents an obstacle. Consequently, the present study proposes a novel, ternary-hybrid mixture of N-methyl diethanolamine (MDEA), amino ethyl ethanol amine (AEEA), and N-methyl 2-pyrrolidone (NMP) to overcome the issue and reduce the reboiler duty. The study employed high levels of CO 2 (45%) and H 2 S (1%) as the base case, while the simulation was performed with the Aspen HYSYS ® V12.1 software to evaluate different parameters that affect the reboiler duty in the acid gas removal unit (AGRU). The simulation was first validated, and the parameters recorded errors below 5%. As the temperature increased from 35 °C to 70 °C, the molar flow of the CO 2 and H 2 S in sweet gas also rose. Nevertheless, the pressure demonstrated an opposite trend, where elevating the pressure from 1000 kPa to 8000 kPa diminished the molar flow of acid gases in the sweet gas. Furthermore, a lower flow rate was required to achieve the desired specification of sweet gas using a ternary-hybrid blend, due to the presence of a higher physical solvent concentration in the hybrid solvent, thus necessitating 64.2% and 76.8%, respectively, less reboiler energy than the MDEA and MDEA + AEEA.

Suggested Citation

  • Abid Salam Farooqi & Raihan Mahirah Ramli & Serene Sow Mun Lock & Noorhidayah Hussein & Muhammad Zubair Shahid & Ahmad Salam Farooqi, 2022. "Simulation of Natural Gas Treatment for Acid Gas Removal Using the Ternary Blend of MDEA, AEEA, and NMP," Sustainability, MDPI, vol. 14(17), pages 1-16, August.
  • Handle: RePEc:gam:jsusta:v:14:y:2022:i:17:p:10815-:d:902009
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    References listed on IDEAS

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    1. Mofarahi, Masoud & Khojasteh, Yaser & Khaledi, Hiwa & Farahnak, Arsalan, 2008. "Design of CO2 absorption plant for recovery of CO2 from flue gases of gas turbine," Energy, Elsevier, vol. 33(8), pages 1311-1319.
    2. Pellegrini, G. & Strube, R. & Manfrida, G., 2010. "Comparative study of chemical absorbents in postcombustion CO2 capture," Energy, Elsevier, vol. 35(2), pages 851-857.
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    1. Tengku Nur Adibah Tengku Hassan & Azmi Mohd Shariff & Nor Faiqa Abd Aziz & Nur Farhana Ajua Mustafa & Lian See Tan & Hairul Nazirah Abdul Halim & Mustakimah Mohamed & Heri Hermansyah, 2023. "Aqueous Potassium Salt of L-Cysteine as Potential CO 2 Removal Solvent: An Investigation on Physicochemical Properties and CO 2 Loading Capacity," Sustainability, MDPI, vol. 15(15), pages 1-23, July.

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