Modification of postcombustion CO2 capture process: A techno-economic analysis

Haider Sultan, Umair Hassan Bhatti, Hafiz Ali Muhammad, Sung Chan Nam*, Il Hyun Baek

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Postcombustion CO2 separation using aqueous amine solution has a great potential to minimize CO2 emissions but is expensive due to huge energy requirement for solvent regeneration. Several structural modifications can be implemented to minimize the regeneration energy requirement and optimize the energy efficiency. In this study, we evaluated the techno-economic benefits of three stripping modifications, namely lean vapor compression (LVC), stripper overhead exchanger (SOE), and an advanced hybrid configuration (LVCSOE) in a single flowsheet aimed at reducing the energy consumption of CO2 separation process using 30 wt.% monoethanolamine (MEA) solution. All the configurations were simulated using Aspen Plus® rate-based modeling, while capital investment was evaluated using Aspen Economic Analyzer®. All the modifications reduced the energy consumption and showed economic benefit compared to the base case. The optimal configuration was LVCSOE, which reduced the energy requirement for solvent regeneration and the CO2 capture cost by 18% and 5.3%, respectively, and can save 5.4 million USD annually. Additionally, sensitivity analysis of economic variables suggested that CO2 capture cost is more sensitive to regeneration steam cost than any other economic parameter. Furthermore, the effect of regeneration steam cost revealed that the implementation of an advanced process configuration can result in higher net savings as compared to the base case at high fuel price.

Original languageEnglish (US)
Pages (from-to)165-182
Number of pages18
JournalGreenhouse Gases: Science and Technology
Issue number1
StatePublished - Feb 2021

Bibliographical note

Funding Information:
This work was supported by the Development Program of the Korea Institute of Energy Research (KIER B9-2432) and by the “Local Demand Customized R&D Support Project” (Project: Recycling of greenhouse and by-products gases utilizing low-grade waste heat from industrial complex) through the Korea Institute of S&T Evaluation and Planning (KISTEP) funded by the Ministry of Science and ICT, Republic of Korea.

Funding Information:
The authors gratefully acknowledge the support by the research project (No. 20172010202000) of Korea Institute of Energy Technology Evaluation and Planning (KETEP) funded by the Ministry of Trade, Industry & Energy, Republic of Korea.

Publisher Copyright:
© 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.


  • advance process configuration
  • aspen simulation
  • CO capture cost
  • heat integration
  • postcombustion CO capture
  • techno-economic analysis

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry


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